CEPOLIS. 177 



Genus CEPOLIS Montfort, 1810. 



= Cepolis Montf.-f- Eurycampta Mart.-f Jeanneretia Pfr.-j-jHemi- 

 trochus Swains. -|- Coryda, Dialeuca and Leptoloma Alb. -\-Histrio 

 and Plagioptyeha Pfr.-f Cysticopsis Morch not Martens. 



Shell globose-depressed or globose-conoid, umbilicate or imper- 

 forate, smoothish, rib-striate or spirally malleated ; lip expanded 

 (or simple and sharp), reflexed at columella, which is generally 

 thickened with an oblique callus, sometimes a tooth ; lip otherwise 

 toothless but occasionally there is a callous fold within the mouth ; 

 varying from unicolored to conspicuously streaked or banded, the 

 bands irregularly disposed. Type C. cepa, pi. 25, fig. 9. (See also 

 pi. 56, figs. 1 to 9, and pi. 58, figs. 54 to 56). 



Animal granulated above, without distinct dorsal grooves, facial 

 furrows or tail-groove, the sole not tripartite except in color ; man- 

 tle with small right and rudimentary left body-lappets. Right eye 

 retracted between branches of genitalia. 



Jaw high arched, with an obvious or slight median projection and 

 sometimes a wide, vertical rib-like median convexity ; its surface 

 smooth or showing slight strise (pi. 57, figs. 41 to 46). 



Radula long, with comparatively few longitudinal rows of teeth 

 (30. 1. 30 to 45. 1. 45). Middle and lateral teeth having long, nar- 

 row basal plates, and short, broad middle cusps, shorter than the 

 basal plates, and with no trace of side cusps. Transition teeth 

 developing the ectocone ; marginal teeth tricuspid, the ento- and 

 meso-cones short, coalescent at base, ectocone simple or bifid. (PI. 

 57, figs. 40, 47 to 51). 



Genitalia (pi. 52, figs. 12-16, 19, 21) characterized by a long, 

 slender penis provided with a weak retractor or none, inserted low 

 on penis and distally on the lung floor ; the apex of penis splitting 

 into a long flag ellum and the v. d. Low on vagina or on atrium is 

 borne a long club-shaped dart sack, with constricted head, which is 

 bound by a string of connective tissue to base of vagina ; at the base 

 of dart sack the glandular, flat, two-lobed, elongated mucus gland 

 is inserted. Sperm atheca long, closely bound to upper end of 

 uterus ; its duct very long, closely adherent to uterus, convoluted on 

 lower end of same, but free from vagina, near the base of which it 

 is inserted. Notwithstanding the well developed dart sack, I found 

 no dart in any of the numerous individuals of this genus exam- 

 ined. 



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