232 MANUAL OF THE MOLLUSCA, 
VOLVARIA, Lam. 
Etymology, vowa, a wrapper. 
Type, V. bulloides, Pl. VIL., Fig. 17. 
Shell cylindrical, conyolute : spire minute; aperture long and 
narrow; columella with three oblique plaits i in front. 
Distribution, 29 species, tropical seas. 
Fossil, 5? species. Hocene. Britain, France. 
MARGINELLA, Lam. 
Etymology, diminutive of margo, a rim. 
Synonyms, Porcellana (Adans.), Gray. Persicula, Schum. 
Types, M. nubeculata, Pl. VII, Fig. 18. M. persicula, 
Fig. 19. 
Shell smooth, bright; spire short or concealed; aperture 
truncated in front; columella plaited; outer lip (of adult) with 
a thickened margin. 
Animal similar to cypreea. 
Distribution, 139 species. -Tropical, West Indies, Brazil, 
Mediterranean (1 small species), West Africa, China, Australia. 
Fossil, 30 species. Hocene—. France, &c. 
Sub-genus, Hyalina, Schum. Outer lip scarcely thickened. 
Type, yoluta pallida, Montfort, West Indies. 
FAMILY VI.—CYPRAIDA. Cowries. 
Shell convolute, enamelled ; spire concealed ; aperture narrow, 
channelled at each end ; outer lp (of adult) thickened, inflected. 
No operculum. 
Animal with a broad foot, truncated in front ; mantle expanded 
on each side, forming lobes, which meet over the back of the 
shell; these lobes are usually ornamented with tentacular fila- 
ments; eyes on the middle of the tentacles or near their base; 
branchial plume single. Lingual ribbon long, partly contained 
in the visceral cavity; rachis 1 toothed; wncini 3. In Ovulum 
the teeth are 2. 1. 2. the outermost broad, with pectinated 
margins. Loyén describes the Cypreeide as haying ashort, non- 
retractile muzzle, and places them between the Naticide and 
Lamellaria. The cowries inhabit shallow water, near shore, 
feeding on zoophytes. 
Cyprma, L. Cowry. 
Htymology, Cypris, a name of Venus. 
Types, C, tigris, C. mauritiana Pl, VIL., Fig. 20. 
