BirOCINII)^, 



101 



CHLANIDOTA, Martens. Shell subglobose, thin, spirally costate. 

 Operculum with apical nucleus. Dentition : middle i)late with five 

 teeth, the outer ones much smaller, laterals with three teeth, the middle 

 one smallest, the outer one somewhat smaller than the inner. 



COMINELLA, Gray. Shell bucciuiform, marked or spotted, covered 

 with an epidermis ; spire short, acute, last whorl large, ventricose, with 

 a posterior depressed groove at the suture, producing a contraction at 

 the hind part of the outer lip.* Operculum with apical nucleus. Den- 

 tition, PI. 27, fig. 33. 



CLE A, A. Adams. Shell turbinate, covered by an epidermis, aperture 



ovately acute, truncate at base and profovindly sinuate, dextral margin 



regularly arcuate, parietal callus none or thin. Opercuhun subtrigonal, 



with apical nucleus. Dentition, PI. 27, fig. 38. Inhabits fresh wate 



Subgenus Canidea, H. Adams. Shell small, fusiform or turbinate, 



covered with an epidermis ; spire longer than the aperture, apex 



eroded ; whorls slightly convex, plicate ; aperture elongately ovate, 



emarginated in front ; columella truncate ; lip simple, sinuated in 



front. Operculum small, imguiculate ; nucleus apical. Dentition, 



PI. 27, fig. 37. Living in fresh water. 



Sub-Family EBURNIN.E. 



E BURN A, Lam. Shell ovate-oblong, thick, porcellanous, under a thin 

 epidermis ; deeply umbilicated ; spire acuminated, whorls more or less 

 convex, suture more or less channeled ; aperture oval ; columella arcu- 

 ated, posteriorly callous ; inner lip spreading, often covering the umbil- 

 icus in the adult ; outer lip simple, acute. Operculum with apical 

 nucleus. Dentition, PI. 27, fig. 33. 



Subgenus Zemira, H. and A. Adams. Umbilicus moderate ; outer lip 

 with a tooth near the fore-part. 



MACRON, H. and A. Adams. Shell ovate, solid, with a thick epidermis; 

 spire elevated ; columella wrinkled, with a callosity at the upper part ; 

 outer lip thin, with a small tooth anteriorly. Operculum ovate, with 

 apical nucleus. Dentition unknown. 



Sub-Family PHOTIN.E. 

 PIIOS, Montfort. Shell cancellated, oblong, acuminated, usually longi- 

 tudinally ribbed ; outer lip sti-iated internally, with a slight sinus near 

 the fore-part ; columella obliquely grooved, or with a single plait in 

 ~front. Operculum claw-shaped, nucleus apical. Dentition, PI. 27, 

 fig. 35. 



* H. and A. Adams (Genera II, 615) make Admnsia, Dunker, a sub-genus 

 of Oominella ; the operculum and facies of the type show it, however, to 

 be a Purpura (See Manual, Vol. II, p. 156). 



