PLATE XVIII. 
Fig. 1. CRASS] N A DANx^IONIENSIS. 
Cbassina Danmoniensisj Lam. Syst. vi. p. 554. 
Venus Danmonia, Moni. Test. Brit. Suppl. p. 45 — 
Dilltv. Cat. p. 167. 
Fig. 2. CRASSINA depressa. 
New, Frith of Forth — Lady Jardine's Cabinet. 
Fig. 9. CRASSINA scotica. 
Venus Scotica, Lam. Syst. v. p. 600. — Mont. Test. Brit. 
Suppl. p. 44 — Mat. and Rack. Liti. Tr. viii. p. 81. 
—Dilltv. Cat. p. 167. 
Fig. 3. CRASSINA elliptica. 
New, Frith of Forth and Greenock — Lady Jardine's Ca- 
binet. 
Fig. 4, 5. CRASSINA compressa. 
Venus Montagui^ Dilltv. Cat. p. 167- — V. compressa^, 
Mont. Test. Brit. Suppl. p. 43. 
Fig. 6. CRASSINA obliqua. 
New, Color Cots, Northumberland — Lady Jardine's Ca- 
binet. 
Fig. 7. CRASSINA convexiuscula. 
New, Color Cots, Northumberland — Lady Jardine's Ca- 
binet. 
Fig. 8. CRASSINA striata. 
New, Frith of Forth — Lady Jardine's Cabinet. 
Fig. 10. CRASSINA sulcata. 
Venus sulcata. Lam. Syst. v. p. 592. — Mont. Test. 
Brit. p. 131. — Mat. and Rack. Lin. Tr. viii. p. 81.— 
Dillw. Cat. p. 166. 
Fig. 11. CYPRINA islandica. 
Cyprina Islandica, Lam. Syst. v. p. 556. 
Venus Islandica, Mont. Test. Brit. p. 114. — Mat. and 
Rack. Lin. Tr. viii. p. 83. — Donov. Brit. Sk, pi. 78. 
Dilltv. Cat. p. 176. 
The uncommonly large specimen from wliich this shell 
was drawn was dredged in the Irish Channel, and is 
in the Cabinet of John Nicol, Esq. Lecturer on Natu- 
ral Philosophy. 
