14 HELIX PLAGIOPTYCHA. 



H. LASSEVILLEI Gundlach. 



Imperforate, turbinate, very thin, striatulate, hyaline ; spire con- 

 vex-conoidal, apex somewhat obtuse, con colored ; whorls 4, slightly 

 convex, regularly increasing, the last not descending, acutely 

 carinated, moderately convex beneath ; aperture nearly diagonal, 

 rhomboid-luimr; peristome simple, acute ; columellar margin short, 

 subvertical, scarcely thickened, joining the basal in a curve. 



Alt. 8, diam. maj. 1H, min. 10 mill. (Pfeifer). 



Gran Piedra, Eastern Cuba. 



H. lassevillei GUNDL. in PFR., Malak. Bl. 1861, p. 220; Monogr. 

 v, p. 57. ARANGO, Fauna Mai. Cubana, p. 64. 



Known to me only by the description of Pfeiffer. Unfigured. 



H. PELLICULA Ferussac. PI. 12, figs. 47-49. 



Subumbilicate, conoid-globose, thin, smooth, yellowish, trifasciate 

 with brown ; whorls 4-5, a little flat ; aperture lunate-rotund ; peri- 

 stome simple, columellar margin dilated. 



Alt. 12, diam. maj. 14, min. 11 mill. (Fer.) 



Habitat unknown. 



H. pellicula FEB., Hist., t. 105, f. 1. PFR. Monogr. i, p. 194; 

 Conchyl. Cab. t. 72, f. 24-26. 



Known to authors only by the description and figures of Ferus- 

 sac. It may be a Hemitrochus, like H. gallopavonis Val. 



** * 



H.jaudonesi CISNEROS, mss. ARANGO, Annal de la Real Acad. de 

 C. Med.fis. y Nat. de la Habana, xii, p. 281. 



Probably belongs to Cysticopsis. I do not have access to the 

 publication containing the description. 



Section II. PLAGIOPTYCHA Pfeiffer, 1856. 



Plagioptycha PFR. Malak. Bldt. 1856, p. 135. ALBERS-MARTENS 

 Die Helieeen 1860, p. 145. 



*** 



Perforate or umbilicate ; columellar lip expanded, not adnate to the 

 base. 



H. INDISTINCT A Ferussac. PL 11, figs. 21-24. 



Nearly covered perforate, depressed, thin, subtranslucent, brown- 

 ish horn-color, with usually a pale supra-peripheral fascia ; more or 



