HELIX CYSTICOPSIS. 7 



Section I. CYSTICOPSIS Morch, 1852. 

 MORCH, Cat. Yoldi, p. 2. ALBERS-MARTENS, Die 

 ffeliceen, 1860, p 144. 



Cysticopsis as here constituted consists of two groups of species, 

 viz. Jamaica shells of the type of H. tumida Pfr. and Cuban species 

 like H. cubensis Pfr., the only species mentioned by Morch, and 

 therefore, of course, the type of the Section. I do not know whether 

 these two elements of the .section will prove to have the same 

 organization when the animal of H. cubensis and its allies is ex- 

 amined, but do not anticipate any considerable difference. Cysti- 

 copsis may be distinguished from Plagioptycha by the sharp lip, 

 not expanded, and the last whorl not deflected at the aperture ; from 

 Hernitrochus by the lighter texture, plainer coloration, and thin, 

 acute peristome. 



Jamaica Species. 

 H. MACMURRAYI C. B. Adams. PI. 12, fig. 32. 



Imperforate, globose-depressed, solid but rather thin, covered 

 with a yellowish chestnut colored thin cuticle, usually rubbed off 

 the whorls except the last, regularly marked with wrinkles of in- 

 crement ; spire low-conical, very obtuse, apex flat ; sutures at first 

 linear, becoming impressed ; whorls about 5J, slightly convex, the 

 last large, rounded ; aperture wide-lunar, slightly oblique ; outer 

 and basal lips thin, acute, regularly arcuate, columellar lip slightly 

 oblique, a rounded pillar of shining callus, dilated in the region of 

 the umbilicus. 



Alt. 35, diam. maj. 45, min. 38 mill. ; alt. 40, diam. 48 mill. 



Jamaica. 



H. MACMURRAYI AD., Contr. to Conch., 1849, p. 32. KEEVE 

 Conch. Icon., f. 208. PFR. in Conchy 1. Cab., p. 302, t, 126, f, 7, 8. 



The largest species of the section ; readily distinguished by the 

 rounded pillar-lip and the size. 



II. BUDDIANA C. B. Adams. PL 20, figs. 82, 83. 



Imperforate, globose, thin, covered with a thin golden-brown 

 cuticle, which under a lens seems to be minutely pitted on the upper 

 surface ; obliquely marked by wrinkles of increment ; spire de- 

 pressed, apex obtuse, sutures well-impresse4 from the apex down ; 



