OF MOLLUSCA. 195 



thin, ovate ; apex truncate ; spire depressed, with a prominent mam- 

 miliary first whorl. 



1. A. pellucida. 



2. A. globosa. 



3. A. hyalina, Forbes $• Hartley, B.M. t. Q.Q. f. 2. Teeth, t. 22. 



f. 2 C. Adams, Gen. Moll. t. 5G. f. 8. 



Central tooth of Amphisphyra ylobosa Fi S- 109.— Teeth of 



broad, subrectangular ; cutting edge trans- Amphisphyra globosa. 

 verse, serrulated ; lateral tooth one, claw- 

 like, slender, expanded at the base, winged 

 on the outside (fig. 102). — Lov6n. 



As in Rissoella the eyes are placed far back, so as to be only seen 

 through the transparent shell. 



§§§ Teeth in thirteen longitudinal series, in straight cross lines 

 (fig. 110). 



Fam. III. BULLINAD.E. 



Teeth : central distinct, lateral 6 ' 6 ; inner ones large, with a strong- 

 hooked point ; outer ones uniform, small. Head disk broad, entire 

 or nicked behind. Foot short. Shell exposed. 



1. BULLINA. 



Animal short, broad. Head depressed, subquadrate, truncated in 

 front. Tentacles broad, flattened, free, recumbent, transverse. Eyes 

 under their base. Foot very short, ovate, quadrate. Mantle edge 

 thickened, closing the hinder part of the aperture. Teeth 4 • 1 " 1 • 1 * 4 j 

 central broad, pectinate ; inner lateral large, curved ; rest small. 

 " Prehensile collar distinct," Alder. Shell cylindrical or fusiform. 

 Columella callous or plaited. 



* Frontal disk elongate, truncated behind. Cyclina. 



1. B. cylindracea, Forbes $• Hanley, B.M. t. V.V. f. 3 ; Adams, 



Gen. Moll. t. 56. f. 6. 



2. B. ?, t. 178. f. 4. 



** Frontal disk short, deeply notched behind. Tornatina. 



3. B. truncata, Forbes fy Hanley, B.M. t. V.V. f. 4 ; Adams, Gen. 



Moll. t. 56. f. 9. 

 Central tooth of Bullina alba small, Fig. 110.— Teeth of Bullina alba. 

 compressed, erect, above wider; cutting ^-^ -.. 



edge slightly produced, serrulated ; (^^A W^Q^S W 1 

 lateral teeth 6, first very large, base on \( 1/ 



both sides produced, with a sharp 

 strong point deflected and toothed on the inside, the other teeth mi- 

 nute, bent and claw-like (fig. 110). — Loven. 



o 2 



