CONCHIFERA. 485 
separate, orifices cirrated, branchial cirri dendritic; foot com- 
pressed, broadly lanceolate; gills large, unequal; palpi small. 
Sub-genus. Anapa, Gray. A. Smithu, Pl. XXI., Fig. 17. 
Umbones anterior, siphonal inflection obsolete. 
Ceronia, Gray. Lateral teeth marked with coarse oblique 
etrice. 
? Davila, Gray. Laterals unequal; anterior teeth small and 
erect. 
Distribution, 31 species. West Indies, Mediterranean, Crimea, 
India, New Zealand, Chili; sands at low water. 
Fossil, 7 species. Neocomian—. United States, Europe. 
(Donacillu, D’Orbigny.) 
Ervitta, Turton. Lentil-shell. 
Etymology, ervilia, diminutive of ervum, the bitter-vetch. 
Type, Ki. nitens, Pl. XXI., Fig. 18. 
Shell minute, oval, close ; cartilage in a central pit; right 
valve with a single prominent tooth in front and an obscure 
tooth behind ; left valve with 2 obscure teeth ; no lateral teeth; 
pallial sinus deep. 
Distribution, 2 species. West Indies, Br un, Canaries, 
Mediterranean, Red Sea. —250 fathoms. 
DonAx, L. Wedge-shell. 
Example, D. denticulatus, Pl. XXI., Fig. 19. 
- Litymology, donax, a sea-fish. (Pliny.) ‘ 
Synonyms, Chione, Scop. Cuneus, Da Costa. Capisterium, 
Meuschen.* lLatona and Hecuba, Schum. Egeria, Lea (not 
Roissy). 
Shell trigonal, wedge-like, closed ; front produced, rounded ; 
posterior side short, straight; margins usually crenulated ; 
hinge-teeth 2.2; laterals 1—1 in each valve ; ligament external, 
pr fecat: pallial sinus deep, horizontal. 
Animal with the mantle fringed; siphons short and thick, 
diverging, anal orifice denticulated, branchial with pinnate 
cirri; foot very large, pointed, sharp-edged, projected quite 1m 
front; gills ample, recumbent, outer shortest; palpi small, 
pointed. 
Distribution, 68 species. Norway, Baltic, — Black Sea, all 
tropical seas. In sands near low-water mark (—S8 fathoms) 
buried an inch or two beneath the surface. 
fossil, 45 species. Carb.—. United States, Europe. 
* Meuschen was a Dutch auctioneer; the names occur in his “sale cataloguea ® 
Idiote imnosuere nomina alsurda. Linnseus. 
