GASTEROPODA. 231 



Fossil, y. Lamberti, Crag, Suffolk, 



Melo, Brod. Large, oyal ; spire short. 

 Type, M. diadema, PI. YII., Fig. 11. New Guinea, 8 species. 



Cymba, Broderip. Boat- shell. 



Synonym, Tetus (Adans.), Gray. 



Type, 0. proboscidalis, PI. VII., Pig. 12, 

 and Pig. 91 (=== V. cymbium, L.). 



Shell like yoluta ,' nucleus large and 

 globular; whorls few, angular, forming a 

 flat ledge round the nucleus, 



The foot of the animal is very large, and 

 deposits a thin enamel over the under side 

 of the shell. It is oyo-viviparous, and 

 the young animal is very large when born j 

 the nucleus becomes partly concealed by the 

 growth of the shell. 



Distribution, 10 species. West Africa, 

 Lisbon. 



^Fig. 91. Cymha, 



MiTEA, Lam. Mitre-sheU. 



Synonyms, Turris, Montfort, Zierliana, Gray. Tiara, Sw. 



Types, M. episcopalis, PL YII., Pig. 13. M. vulpecula 

 Pig. 14. 



Shell fusiform, thick ; spire elevated, acute ; aperture small, 

 notched in front ; columella obliquely plaited ', operculum very 

 small. 



The animal has a very long proboscis ; it emits a purple 

 liquid, having a nauseous odour, when irritated. The eyes are 

 placed on the tentacles, or at their base. Eange, from low 

 water to 15 fathoms, more rarelv in 15 — 80 fathoms. 



Bistrihution, 420 species. Philippines, India, Eed Sea, 

 Mediterranean, West Africa, Greenland (1 species), Pacific, 

 West America. The extra-tropical species are minute. M. 

 Greenlandica and M. Cornea (Mediterranean species) are found 

 together in the latest British Tertiaries. (Forbes.) 



Fossil, 90 species. Chalk—. India, Britain, Prance, &c. 



Sub-genera. Imbricaria, Schum, (conoelis, Sw.) 



Shell cone-shaped. I. conica, PI. TIL, Pig. 15. 



Cylindra, Schum. (Mitrella, Sw.) 



Shell olive-shaped. C. crenulata, PI. VIL, Pig. 16. 



