94 
strie (becoming tuberculated anteriorly) of which the 
longitudinal are the more prominent; lunule indistinct; 
inside glossy white or yellowish, purple about the car- 
tilage; two of the teeth cloven. 2...3. Common on 
Sandy Coasts. 
V. Puusastra. Pen. 4. p. 210.—Lam. 47.—Lin. 
T.6. t.17. f. 13,4. and vol. 8. p. 88. t. 2. f. 7.— 
Mont. p. 125.—Dor. Cat. p. 36. t.1. f. 8.—Turt. 
C. D.p. 244.—Turt. B.p.—VENERvPIs P. F: p. 451. 
—V. Senecaensis. D. p. 206.—Oblong, anteriorly 
subangulated, reticulated by fine strie, of which the 
concentric are the more apparent and become sublamel- 
lar anteriorly, white, with purple blotches (rarely grey 
with dark rays) ; lunule rather obscure ; middle tooth 
cloven. 12...13. Common. 
TriBE.— CARDIACEA. 
Having irregular cardinal teeth, bothin form and 
situation : usually with one or two lateral. 
Grenus.—CARDIUM. 
Equivalve, subcordiform ; beaks prominent ; inner 
margin of the valves denticulated or plicated ; hinge 
with four teethin both valves, two approaimated ob- 
hique, cardinal teeth mutually inserted and crossing 
each other and two remote lateral. 
