OF MOLLUSCA. 31 



Fam. X. TURBINELLIME. 



Teeth 1"1*1; central few-lobed, broader than lateral ; lateral 

 teeth narrow, strong, with a single large lobe. Shell with an elongated 

 straight canal, and large transverse fold on the pillar. Operculum 

 ovate (fig. 16). 



1. TURBINELLUS. 



Shell ovate or top-shaped ; spire Fig- 15. 



conical; whorls smooth or rather Teeth oi Cyn. cornigera. 



waved ; apex mamillated ; mouth 

 ovate, narrowed in front ; outer lip 

 simple ; inner lip smooth ; pillar 

 with several large transverse plaits ; 

 canal wide, straight. Operculum 

 ovate, inner edge straight. Animal 



1. T. pyrum. * ig "! 6 ' 



1 J Operculum. 



2. Cynodonta. 



Shell ovate, fusiform ; spire conical ; mouth elon- 

 gate, oblong ; outer lip ? ; inner lip ? ; pillar 



with distinct transverse plaits. Operculum ovate, inner 

 edge curved (fig. 16). 



1. C. cornigera, t. 8. f. 3 ; Adams, Gen. Moll. t. 1/. f. 1. 



2. C. ceramica, t. 93. f. 3. 



3. C. pugillaris. 



Animal of C. cornigera olive-green. Foot irregularly crumpled 

 in front when contracted ; proboscis very long, cylindrical, rather 

 thicker at the end; lingual membrane elongate, narrow. Teeth 

 in three rows, 1 * 1 • 1 , equal ; central strongly three-toothed ; lateral 

 with a lunate base, not reversible, with a single subcentral process 

 (fig. 15). 



C. Rachiglossa, Gray. Teeth in a single central series. Oper- 

 culum annular or none. Mantle siphoned. Shell channeled in 

 front ; pillar plaited (see pp. 10, 28). 



Fam. XI. VOLUTIM3, Flem. 



Siphon of mantle very short, recurved. Shell with a nick in 

 front for the siphon, and the front of the pillar regularly and deeply 

 plaited. The foot is generally large, and often deeply nicked on 

 each side in front. Lingual membrane linear, with one series of 

 teeth (fig. 17-19). 



