GASTEROPODA. 



119 



mantle often lobed and reflected over the shell ; eyes on the tentacles, or near 

 their base. Lingual ribbon linear ; rachis toothed ; pleura unarmed. 



VOLUTA, L. Volute. 

 Type, V. musica, PL VII., fig. 9. 



Syn., cymbiola, harpula, Sw. Volutella, D'Orb. Scapha, &c., Gray. 

 Shell ventricose, tliick ; spire short, apex mammillated ; aperture large, 

 deeply notched in front ; columella with several plaits. V. musica and a few 

 others have a small operculum. 



Animal, eyes on lobes at the base of the tentacles ; siphon with a lobe on 

 each side, at its base ; lingual teeth 3 cusped. 



V. vespertilio and hebrcea fill the nuclei of their spires with solid shelL 

 V. tbrasiliana forms nidamental capsules 3 inches long. (D'Orb.) In V. 

 angulata the mantle is produced into a lobe on the left side, and overlaps the 

 shell. 



W. Indies, Cape Horn, W. Africa, Australia, Java, Chili. 

 Chalk . India, Brit., Trance, &c. 

 Volutilithes, Sw. Spire pointed, many-whirled, columella 

 V. spinosus, PI. VII., fig. 10. 

 (V. abyssicola], dredged at 132 fathoms; off the Cape. 



Distr., 70 sp. 



Fossil, 80 sp. 



Sub -genera. 

 plaits indistinct. 



Living, 1 sp. ( 

 (Adams). 



Fossil, Eocene. 



Brit., Paris. 



Scaphella, Sw. Fusiform, smooth. 

 Ex., V. magellanica. Fossil, V. Lamberti, Crag, Suffolk. 



Melo, Brod. Large, oval ; spire short. 

 Type, M. diadema, PL VII., fig. 11. New Guinea, 8 sp. 



CYMBA, Broderip. Boat-shell. 



Syn., Yetus (Adans.) Gray. 



Type, C. proboscidalis, PL VII., fig. -12, and fig. 

 74 (= V. cymbium, L.) 



Shell like voluta ; nucleus large and globular ; 

 whirls 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 

 ovo-viviparous, and the young animal is very large 

 when born ; the nucleus becomes partly concealed by 

 the growth of the shell. 



Distr., 10 sp. W. Africa, Lisbon. 



MITRA, Lam. Mitre -shell. 



Syn., turris, Montf. Zierliana, Gray. Tiara, 

 Sw. 



Cymba. 



