manual of the mollusca. 



[Eamily Volutid^] 



Contains CoLUMBELLiisrA (p. 221), Mitra [Imbricaria, Cylindra, 

 StrigatelJa, and Hyalina) (p. 231), YoijTSTA.{yolutilit]ies, Scaphella, 

 Volutomitra, and Melo) (p. 230), Cymba (p. 231), Maeginella 

 (p. 232), YoLYAEiA (p. 232), and 



Lybia, Gray, 1847. 



Synonyms, Harpella, Gray ; Enseta, Gray. 



Types, L. deliciosa, Montf. ; L. harpa, Barnes. 



Shell ovate oblong, mitriform, thick, sometimes longitudi- 

 nally costated ; aperture subovate, with a large number of 

 columellar plaits, the two anterior of these being the strongest ; 

 posterior portion of the inner lip provided with a large number 

 of short cross-plaits. Operculum ovate-elongate, thin ; corneous 

 nucleus at first nearly central, at a more advanced age sub- 

 apical. 



Distribution, 14 species. Pacific Ocean, America, Madagascar, 

 Australia, Japan, New Caledonia, Antilles. 



Fossil, 3 species. Cretaceous. India. The species in the 

 Tertiary strata have not been distinguished from Voluta. 



Cystiscijs, Stimpson, 1865. 



Type, C. capensis. Cape of Good Hope. 



Shell resembling that of Marginella ; small, thin, ovate, 

 inflated, smooth, and polished ; aperture narrow, columella 

 plaited. 



Animal with an elongated foot, truncated in front ; head ob- 

 long, depressed ; tentacles triangular, flattened, and horizontal ; 

 eyes at the lateral margins of the head, at the bases of the ten- 

 tacles. Lingual dentition, 0*1 "0, resembling the rhachidian 

 teeth of Murex, thick and strong, with seven unequal conical 

 denticles. 



[Family Cypr^idje] 



Includes Erato, Cypr^ea {Cyprovula, Luponia, and Trivia), 

 OvTJLA {Volva and Radius), Pachybathron, Pedicularla, and 

 Dentiora, Pease, 1862. 



Type, D. rubida. Sandwich Islands. 



Shell difiers from that of Pedicularia in the flat or excavated 

 columella, compressed, and toothed. 

 16 



