106 BRACHYPODELLA, JAMAICAN. 



Subgenus APOMA Beck, 1837. 



Apoma BK., Index Moll., p. 89, for elongata Chemn. (chem- 

 nitziana Fer.). Casta ALBERS, Die Hel., 1850, p. 208, for 

 elongata Ch. and gracilis Wood, the former selected as type 

 by v. Mart., 1860. Cochlodina 3eme groupe Anomales, 

 Ferussac, Tabl. System, p. 62 (in part; for Balea perversa 

 and Brachy. chemnitziana) . 



Shell sinistral, slender, cylindric-tapering, white, densely 

 and finely striate; whorls about 16 in entire shells, about 7-8 

 being below the plug; suture oblique; last whorl not free, 

 carinate at the base ; aperture longer than wide, the peristome 

 reflexed, free or adnate above. Axis simple, very slender, 

 straight above, spirally coiled in the later whorls. Apex high, 

 with a deep axial pit. Viviparous, the young at birth having- 

 about 5 whorls. Teeth as in Mychostoma (pi. 10, fig. 20, B. 

 chemnitziana) . 



A group of the high interior of Jamaica, allied to Mychos- 

 toma, but distinct by the oblique whorls, very slender and 

 spirally coiled axis, adnate last whorl and long aperture. 



The species are viviparous, as first noticed by Gloyne. The 

 young shells of B. gracilis at birth are about 4 mm. long, com- 

 posed of 5-5% faintly striate whorls, the last of which is 

 somewhat more globose than the succeeding post-natal whorl, 

 thus distinguishable in adult shells when the apex is retained. 

 Fig. 5 of pi. 2 represents a young shell of B. gracilis removed 

 from the mother, and not quite at full term. 



49. B. CHEMNITZIANA (Ferussac). PL 2, figs. 1, 2, 3, 4. 



Shell sinistral, turrite, tapering, rather thin, white. Usu- 

 ally truncate, about 9 whorls being abandoned and part of 

 them lost, there being about 7 whorls below the long, rough- 

 ened and convex plug. Whorls strongly convex, densely and 

 regularly striate obliquely, the last having a short but strong 

 basal keel. Aperture oval, vertical, the peristome wide, white 

 and flatly reflexed, barely free above or adnate there. Axis 

 extremely thin, spirally coiled in the lower 2 whorls, straight 

 above. 



Length 26, diam. 4.5 mm., whorls remaining 8%. 



