66 BRACHYPODELLA, S. STR. 



be from near Quito, the only species of the group I have not 

 seen, is placed here for want of a better place. The Mexican 

 and Guatemalan forms have recently been grouped by Prof, 

 von Martens in Epirobia, which he ranks as a subgenus of 

 Holospira; but the slender, imperf orate, uniplicate axis, sculp- 

 tured apex, and strongly keeled base of the shell alike indi- 

 cate their alliance to Brachypodella. Their generic position 

 is herein demonstrated by the dentition (pi. 9, figs. 9, 10, 13, 

 15, 16), which is that of Brachypodella, and shows no kinship 

 whatever with Epirobia, figured on pi. 50 of vol. xv, f . 6, 7. 



The first whorl is less elevated than in B. antiperversa and 

 other Antillean species of the typical section of Brachypo- 

 della, approaching the more normal contour seen in most 

 Cuban and Haitian subgenera of the genus (pi. 6, f, 9, B. 

 hanleyana; f. 14, B. spelunccc) . The radula is quite similar 

 to that of the Antillean species of the subgenus (pi. 9, fig. 9, 

 outer, and 10, inner, lateral of B. morini, in profile; fig. 13, 

 inner lateral of B. leucopleura in profile; 15, B. spelunca; 

 fig. 16, B. trinitaria, large form. 



Key to species. 



(B. subula, no. 23, is not included in the following key.) 

 I. Central American species. Apical whorls, when present, 

 very finely, densely striate. 



1. Riblets very low, wide-spaced, closer and sharper on 

 last whorl ; 12 to 14 mm. long with 16-21 whorls, or, in 

 entire shells, 23 whorls. B. subtilis, no. 20. 



2. Riblets strong but narrow. 



a. Whorls very convex, with 25 to 30 or more riblets 

 on the penult. 11-15 mm. long with 15-18 whorls 

 in truncate, 15-16 mm. long with 22-24 whorls in 

 entire shells. B. morini, no. 19. 



6. Whorls moderately convex, with 14-16 riblets on 

 penult, whorl. 10-12 mm. long with 12-14 whorls 

 in truncate, 14-16 mm. with 22 whorls in entire 

 shells. B. speluncce, no. 21. 



c. Penult, whorl with 18-20 riblets; shell widely trun- 



