GASTEROPODA. 



119 



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

 theii- base. Lingual ribbon linear ; rachis toothed ; pleurce uuai-med. 



VoLUTA, L. Volute. 

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



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

 Shell ventricose, thick ; spire short, apex manimillated ; aperture large, 

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

 others have a smaU 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 hehrcea till the nuclei of their spii'cs with solid shell. 

 V. brasiliana forms nidamcntal capsules 3 inches long. (D'Orb.) In V. 

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

 shell. 



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

 Chalk — . India, Brit., France, &c. 

 Vol v.t With es, Sw. Spire pointed, many-whirled, columella 

 V. spinosus, PI. VIL, fig. 10. 

 {V. ahysskola), di-edged at 132 fathoms ; otf the Cape. 



Bistr., 70 sp. 



Fossil, 80 sp. 



Sub-genera. 

 plaits indistinct. 



Lhnng, I sp. 

 (Adams). 



Fossil, Eocene. 



Brit., Paris. 



Scaphella, Sw. Fusifonn, smooth. 

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



3Ielo, Brod. Large, oval ; spire short. 

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



Cymba, Brodcrip. Boat-sheU. 



Syn., Yctus (Adans.) Gray. 



Type, C. proboscidalis, PI. VII., fig. 12, and fig. 

 74 (= V. cymbium, L.) 



Shell like voluta ; nucleus large and globular ; 

 whii-ls few, augidar, forming a flat ledge round the 

 nucleus. 



Tlae foot of the animal is very large, aud deposits 

 a thin enamel over the under side of the shell. It is 

 ovo-viviparous, and the young animal is very lai-ge 

 when born ; the nucleus becomes partly concealed by 

 the growth of the shell. 



Distr., 10 sp. AY. Africa, Lisbon. 



MiTKA, Lam. Mitre -shell. 



Syn., turris, Montf. Zicrliaua, Gray. Tiara, 

 Sw. 



Cymba. 



