CAUCASIAN LAURLK. 81 



tinguished by the pure white lip, not orange-colored. Only 

 V/2 per cent of all the specimens belong to this mutation, 

 which seems confined to the higher, colder stations of those 

 mountains (Boettger). 



20. Lauria pulchra (Ret.). (PL 9, figs. 11, 13, 14, f. bilabi- 

 ata) . 



Shell ovate-oblong, densely costulate, a little glossy, pale 

 corneous. Spire ovate-conic, the summit shortly conic, suture 

 impressed. Whorls 7%-8, slightly convex, densely obliquely 

 costulate, the last tapering, ascending in front, one-third the 

 length of the shell. Aperture vertical, truncate-semioval, 

 strongly contracted with 5 folds: 1st and 2d on the parietal 

 wall, the latter deeper, the first much stronger, joined to the 

 insertion of the lip by a sinuate callus; 3d and 4th, the last 

 stronger, on the columella; 5th compressed, not erect behind, 

 arising from the base of the outer margin. A long, crest-like 

 tooth in the middle of the right margin, 5 other minute plici- 

 form, obsolete denticles between the 4th and 5th folds. Peri- 

 stome thickly white-lipped. Length 4, diam. 2 mm. (Ret.). 



Crimea: Sudak (drift specimens). Tscherkessia, Russian 

 Armenia: Uetsche-Dere (Konig). 



Pupa (Charadrobia) pulchra Retowski, Malak. Bl., n. F., 

 vi, 1883, p. 57 (not pi. 2, f. 13). — Pupa (Charadrobia) pul- 

 chra Ret., Bull. Soc. Imp. Nat. Moscou, Annee, 1888 (1889), 

 p. 287. — Pupa (Charadrobia) pulchra Ret. f. bilabiata Re- 

 towski, Malak. Bl. n. F., ix, 1887, p. 35. 



It differs from superstructa Mouss. by the smaller size with 

 the same number of whorls, the ovate shape and the close 

 costulation of all the whorls. The folds of the aperture are 

 the same except that the fifth [lower-palatal], which in super- 

 structa becomes very distinctly higher within, in pulchra re- 

 mains nearly of equal height throughout its length. The 

 plate-like widening of the inner right lateral margin of the 

 aperture (referred to as a tooth in the description, following 

 Mousson's example), projects more strongly in pulchra than 

 in superstructa (Ret.). 



The typical pulchra has not been figured, and I have not 



