GASTEROPODA. 931 
Fossil, V. Lamberti, Crag, Suffolk. 
Melo, Brod. Large, oval; spire short. 
Type, M. diadema, Pl. evil: Fig. 11. New Guinea, 8 species. 
CymBA, Broderip. SBoat-shell. 
Synonym, Yetus (Adans.), Gray. 
Type, C. proboscidalis, Pl. VII., Fig. 12, 
pad wis, 91 (—-V. cymbium, L.). 
Shell like voluta; nucleus large and 
elobular; whorls few, angular, forming a 
flat ledge round the nucleus. 
The foot of the animal is very large, and 
deposits a thin enamel oyer the under side 
of the shell. It is oyo-yiviparous, and 
the young animal is very large when born; 
the nucleus becomes partly concealed by the 
growth of the shell. 
Distribution, 10 species. West Africa, 
Lisbon. 
Fig. 91. Cymba. 
Mirra, Lam. Mitre-shell. 
Synonyms, Turris, Montfort. Zierliana, Gray. Tiara, Sw. 
Types, M. episcopalis, Pl. VII, Fig. 13. M. vulpecula 
Fig. 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, haying a nauseous odour, when irritated. The eyes are 
placed on the tentacles, or at their base. Range, from low 
water to 15 fathoms, more rarely in 15—80 fathoms. 
Distribution, 420 species. Philippines, India, Red Sea, 
Mediterranean, West Africa, Greenland (1 species), Pacific, 
West America. The extra-tropical species are minute. WM, 
Greenlandica and M. Cornea (Mediterranean species) are found 
together in the latest British Tertiaries. (Forbes.) 
Fossil, 90 species. Chalk—. India, Britain, France, &c. 
Sub-genera. Imbricaria, Schum, (concelix, Sw.) 
Shell cone-shaped. I. conica, Pl. VIL., Fig. 15. 
Cylindra, Schum. (Mitrella, Sw.) 
Shell oliye-shaped. OC. crenulata, Pl. VIL, Fig. 16. 
