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The title: Lexicon Urthus is somewhat suspect. I don't know Latin but have reason to believe that the correct form would be Urthis. However, Urthis doesn't look quite as Romanesque as Urthus to my uneducated eye.
Acis (p. 5) pronunciation switched with Acies; should be UH-case, or perhaps UH-kiss.
Acies (p. 5) pronunciation switched with Acis; should be uh-KEY-us.
Amaranthine (p. 13) definition misses the point that this is a color word. The giantesses don't have undying fingernails but dark red or purple ones.
Amphisbaena (p. 13) citation that this snake/symbol was alluded to by the hierodules (III, chap. 33, 244); the hierodules bit should be replaced with a see Uroboros in the Amphisbaena entry and moved to the Uroboros entry.
Book of Mirrors (p. 42) I no longer believe the mirrors of The Book of Mirrors lead to Yesod. (For more details, please see AE&3 entry on Yesod: one of three universes.)
brown book (p. 48) the last entry should give The Just Man citation as IV, chap. 11, all rather than IV, chap. 2, all.
Calendar of Events (p. 53). Curt Wiederhoeft tells me that the symbols for lunar phases are accurate for Northern Hemisphere locations but not for Southern ones, where the waxing/waning symbols should be switched. I.e., rather than beginning at right edge, waxing/waning begins at left edge. In addition, the Lunar Phase symbols are misaligned in two spots. The black New Moon should line up with week 29, the others to follow it at one week intervals. Likewise the next year.
In addition, it looks like:
13th day of month--Thecla arrives.
14th day of month--journeymen sent to find House Absolute?
15th day of month--"I asked for books two days ago, when I came." Severian visits Library.
17th day of month--Severian called to Gurloes ("next day but one").
18th day of month--Severian visits Echopraxia.
Chrism (p. 65) better defined by its use than its composition: LU says oil and balm, but the chrism of the torturers is blood.
Fish's Mouth (p. 106), correction: while the star Fomalhaut is an A3 type of star (a class of stars collectively called "white"), in fact it is reddish in our skies today (and in The Book of the New Sun).
Grand Gnab (p. 117) gnab is also bang spelled backwards.
Green Man (p. 118): There are Doors should be There Are Doors.
guild table (p. 119) the tinct column should be fixed.
Holy Katherine (p. 145) should read Holy Katharine.
Military Organization (p. 171) locus should be lochus.
Mucid (p. 174) SOED gives primary meaning mouldy, a little stronger than the Lexicon's musty.
Nessus map (p. 176): Algedonic Quarters should be Algedonic Quarter.
Onomastics (p.186) add parenthesis (except Jonas) since Jonas is an Old Testament name, that is, not that of a post-New Testament saint.
Oringa (p. 188) is almost certainly the name of the little girl Severian meets in the antechamber rather than some servant of the House Absolute.
planetaration (p. 205) should be planteration (Tim Reilly, 2009).
Preceptress (p. 209) Isanogoma should be Isangoma.
Severian history section (p. 223): "a bishop of Scythopolis . . . murdered by Eutychian heretics with connivance of the empress Eudoxia." Darrell Schweitzer questions that it was Eudoxia, who was wife of Theodosius II. Back tracking to the source text confirms that Eudoxia is the name given in The Book of Saints (1966), but it was subsequently corrected to Eudocia in a later edition. Thus, the line from the Severian entry should read, "with connivance of the empress Eudocia." (Darrell Schweitzer, 2009)
technology levels (p. 235) hastauri should be hastarii.
Terminus Est (illustration, p. 237), this is not a very accurate rendering of the sword in question. The illustration was originally slated for use under carnificial sword, but later on it was determined that there were many illos and entries for A through E, but not many illos toward the end. So it was moved.
thalangii (p. 239) should be thalamegii, the plural form of thalamegus.
Thecla (p. 239) correction, she did not exactly take her own life to avoid another session with the revolutionary, rather, she did so to avoid further torment by the in-dwelling demon summoned by the device.
tokoloshe (p. 243) in African folklore a mischievous and lascivious hairy dwarf according to the OED. Fear of these monsters is apparently widespread in Africa, but there is no direct connection to native tribes in Brazil. So it may be that Robert and Marie in the Jungle Garden are in equatorial Africa.
vicuna (p. 258), addition to History: In pre-Columbian Peru, cloth made of vicuna was reserved for the use of the Inca himself, thus becoming a symbol of his semi-divine status as a descendant of the Sun God Inti.
Valeria's Reign (p. 255) the term regent, used with regard to Valeria's Reign, appears to be very incorrect. Valeria's rule is not a regency, it is a pseudoautarchy, because she was not named regent by Severian (he seems to have left Father Inire in charge--so if there is a regent it is Inire), nor did she eat Severian's brains. Her rule might be a cryptoregency, at best. (for more detail, see AE&3)
Zama (p. 275) correction: the traditional site of Scipio's defeat by Hannibal should be the traditional site of Scipio's defeat of Hannibal, since Scipio won the battle.
Ships (p. 278) thalangii should be thalamegus.
Bibliography (p. 280) Castle of Days should be listed here, especially since it was cited in the entry for Grand Gnab. Timescape (which I listed as publisher of The Shadow of the Torturer) should be replaced with Simon & Shuster.
Wolfe, Gene. Castle of Days. New York: Tor Books, 1992.
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