CEPOLIS. 183 



Shell imperforate, rather thin, more or less trochoidal, varying 

 from high and pyramidal to low trochiform ; lip thin, slightly ex- 

 panded, a little widened and reflexed at the columella. Type C. 

 nemoraloides, pi. 56, fig. 5. (See also C. fuscocincta, pi. 56, fig. 6). 



Animal light colored or dark as in H. alauda. Jaw, dentition, 

 etc., also as in Coryda (pi. 57, figs. 43, 48, jaw arid dentition of C. 

 platystyla). 



This section might well be united to Coryda, from which it differs 

 only in distribution and the somewhat thinner shell. The typical 

 Dialeucas are from Jamaica, but a few species are from Navassa 

 (H. gaussoini), and the Cayman Is. (streatori, caymanensis) ; and the 

 closely allied H. phceogramma, of which I have seen a specimen in 

 Ponsonby's collection, is not yet located. 



C. conspersula Pfr., v, 38. C. nemoraloides Ad., v, 40. 



v. fuscocincta Ad., v, 39. v. pulchrior Ad., v, 41. 



v. platystyla Pfr., v, 39. gossei (C. B. Ad.), Pfr., Rv. 



v. virginea Ad., v. 39. C. gaussoini Tryon, v, 197. 



C. subconica Ad., v, 40. C. streatori Pils., viii, 240. 



gossei Pfr. ! C. caymanensis Mayn., viii, 241. 



C. jacobensis Ad., v, 41. C. phseogramma Pfr., v, 42. 

 C. blandiana Ad., v, 41. 



Section Hemitrochus Swainson, 1840. 



Hemitroehus Sw., Malacol., p. 331, type H. hcemastomus=H. var- 

 ians. BINNEY, Terr. Moll., v, p. 174, and Ann. N. Y. Acad. Sci., 

 iii, p. 90 (jaws and teeth of varians, troscheli, gallopavonis, rufoapi- 

 eata, graminieola, milleri). Polytcenia MARTENS, Die Hel., p. 129, 

 type H. multifasciata. Phcedra ALB., Die Hel., p. 100. 



Shell globose-conoid or globose-depressed, solid, smooth or rib- 

 striate, opaque, variegated with bands or dots, the umbilicus narrow 

 or closed ; last whorl slightly descending. Lip blunt, simple or ex- 

 panded, thickened within, reflexed at columellar insertion. Type C. 

 varians, pi. 56, figs. 1, 2. 



Jaw highly arched, with a median projection and sometimes a 

 median rib-like convexity (pi. 57, fig. 41, C. varians. PI. 57, fig. 46, 

 C. milleri). 



Radula having long, narrow basal plates and broad, short central 

 cusps without side cusps on median and lateral teeth. Marginals 



