120 MANUAL OF THE MOLLUSCA. 





Types, M. episcopalis, PI. YII., fig. 13. M. -^iilpecula, fig. 14. j 



Shell fusiform, thick ; spire elevated, acute ; apertui-e small, uotched iu .; 

 front ; columella obliquely plaited ; operculum very small. 



The animal has a very long proboscis ; it emits a purple liquid, ha-^-ing a 

 nauseous odom', when irrritated. The eyes are placed on the tentacles, or at 1 

 their base. Range, fi'om low water to 15 fathoms, more rarely in 15 — 80 ] 

 fathoms. 



Distr., 350 sp. Philippines, India, Red Sea, Medit., W. Africa, Green- "^ 

 land (1 sp.). Pacific, "W. America. The extra-tropical species are minute. *j 

 M. Greenlandica and M. cornea (Medit. sp.) are foimd together in the latest j 

 British Tertiaries (Forbes.) 



Fossil, 90 sp. Chalk — . India, Brit., France, &c. 



Sub-genera. Imhricaria, Schimi. (conoelix, Sw.) 



Shell, cone-shaped. I. conica, PL VII., fig. 15. 



Cylinclra, Schum. (MitreUa, Sw.) 



Shell, olive-shaped. C. crenulata, PI. YII., fig. 16. 



VoLVARiA, Lam. 

 Htym., volva, a wrapper. 

 Type, V. buUoides, PI. YII., fig. 1?. 

 Shell cylindi'ical, convolute ; spii-e minute ; apertui'e long and narrow 

 columella with 3 oblique plaits in front. 

 Fossil, 5 ? sp. Eocene. Brit., Fi-ance. 



j 



Margin ELLA, Lam. 



Etym., diminutive of margo, a rim. *' 



Syn., porcellana (Adans.) Gray. Persicula, Schum. ' 



Types, M. nubeculata, PI. YII., fig. 18. M. persicula, fig. 19. 



Shell, smooth, bright ; spire short or concealed ; aperture truncated in 



front ; columella plaited ; outer lip (of adult) ^"ith a thickened margin. '^ 



Animal similar to cyprsea. | 



Bistr., 90 sp. Tropical, W. Indies, Brazil, Medit. (1 small sp.) W. ^ 



Africa, China, Australia. jk 



Fossil, 30 sp. Eocene — . France, &c. | 



Sub-genus. Hyalina, Schum. Outer lip scarcely thickened. 



Tijpe, voluta pallida, Mont., W. Indies. 



FAMILY YI. Cypr^id^. Co\raes. 



Shell convolute, enamelled ; spire concealed ; aperture narrow, channelled 

 at each end ; outer lip (of adult) thickened, inflected. No operculum. 



Animal with a broad foot, truncated in front ; mantle expanded on each 

 side, forming lobes, which meet over the back of the shell ; these lobes are 

 usually ornamented with tentacular filaments; eyes on the middle of the ten- 

 tacles or near their base : branchial plume single. Lingual ribbon long. 



