158 VERTIGO OP JAPAN AND EASTERN ASIA. 



distribution and nearly the duration of the Gastrocopts, which 

 are also related to those of the Bonin Islands. 



The Tertiary species are enumerated on page 220. 



41. VERTIGO DEDECORA (Pilsbry). PI. 15, figs. 5, 6, 7, 9. 



The shell is minute, with a distinct circular perforation, and 

 a rather long umbilical chink, obesely oval, tawny, the surface 

 having very weak but somewhat coarse striae and very little 

 gloss. The whorls are moderately convex, the last one flat- 

 tened over the palatal folds, rising in a rounded, lighter- 

 colored crest behind the peristome, this crest being very promi- 

 nent at the base. The parietal lamella is very long, entering 

 deeply, not emerging to the edge of parietal callus. Angu- 

 lar lamella is much shorter, connected by a callus with the 

 termination of the outer lip. The columellar lamella is hori- 

 zontal and deeply immersed. Upper palatal fold is larger and 

 longer than the lower, and it emerges nearly to the peristome. 

 Basal fold is short and somewhat immersed. There is a dis- 

 tinct palatal callus. The peristome expands and is of a 

 tawny color, the margins united by a distinct parietal callus. 

 The outer margin is slightly impressed in the middle, a 

 slight groove preceding the impression. 



Length 1.5, diam. 1 mm. ; 5 whorls. 



Length 1.6, diam. 1.05 mm. ; 5 whorls. 



Bonin Islands (Ogasawara-jima) : Hahajima, Y. Hirase. 

 Type no. 82583 A. N. S. P. 



Nesopupa dedecora PILSBRY, Proc. A. N. S. Phila., Apr. 23, 

 1902, p. 31. 



The compact, broadly oval figure, strong crest, long parietal 

 lamella and the union of angular lamella with the peristome 

 are the more prominent features of this species. 



41a. V. d. tamagonari Pils. & Hir. PI. 15, figs. 10, 11. The 

 shell is somewhat more globose and often smaller than typical 

 dedecora; the crest is not quite so prominent. Chichijima, 

 Ogasawara. 



Length 1.4, diam. 0.95 mm. (type). 



Length 1.5, diam. 1 mm. 



Nesopupa tamagonari PILSBRY & HIRASE, Nautilus xvii, Feb., 

 1904, p. 118. 



