452 CYPRINID^. 



even generic value, though In this, of only individual 

 importance. Mr. Searles Wood has suggested that the 

 difference in the margin may indicate sexual distinctions ; 

 an observation deserving of minute inquiry. 



A. Sulcata,* Da Costa. 



More or less convex, never elliptical ; ribs occupying the en- 

 tire surface, not peculiarly close set : lower margin crenated in 

 the adult. 



Plate XXX. fig. 6, {A. Danmoniensis) and (Animal) Plate M. fig. 5. 



Pectunculus mlcatus, Da Costa, (1778) Brit. Conch, p. 192. 

 Venus borealis, (in part) Chemn. Conch. Cab. vol. vii. p. 26, pi. 39, f. 413. 

 „ Svoitca, Maton, Linn. Trans, vol. viii. (1807) p. 81, pi. 2, f. 3. — Mont. Test. 

 Brit. Suppl. p. 44. — Turt. Conch. Diction, p. 236. — Lam. 

 Anim. s. Vert. (ed. Desh.) vol. vi. p. 360. — Dillw. Recent 

 Shells, vol. i. p. 167. — Index Tcstaceologic. pi. 7, f. 20. 

 „ Batmonia, Mont. Test. Brit. Suppl. (1808) p. 45, pi. 29, f. 4.— Dillw. 

 Recent Shells, vol. i. p. 167. — Index Testaceol. pi. 7, f. 21, 

 Crasshia Danmoniensis, Lam. Anim. s. Vert. (ed. Desh.) vol. vi. p. 257. — Brit. 

 Marine Conch, p. 80. — Brown, 111. Conch. G. B. p. 

 95, pi. 38, f. 1.— Crouch, Introd. Conch, pi. 6, f. 7. 

 — Delessert, Rec. Coquil. pi. 7, f. 1. 

 Venus sulcata, Turt. Conch. Diction, p. 235. 



Crassina Scoiica, Turt. Dithyra Brit. p. 130, pi. 11, f. 3, 4. — Brit. Marine 

 Conch, p. 79.— Brown, 111. Conch. G. B. p. 95, pi. 38, f. 9. 

 — Hanl. Recent Shells, vol. i. p. 87. 

 „ sulcata, Turt. Conch. Dithyra Brit. p. 131, pi. 11, f. 1, 2. — Hanl. 

 Recent Shells, vol. i. p. 87. 

 Astarte Scoiica, Flem. Brit. Anim. p. 440. — Macgill. Moll. Aberd. p. 258. — 

 Philippi, Neuer Conch, vol. ii. p. 5G, Astarte, pi. 1, f. 3. — 

 LovEN, Index Moll. Skandinav. p. 36. 

 „ Danmoniensis, Sowerby, Genera Shells, Astarte, f. 1,2, 3. — Flem. Brit. 

 Anim. p. 440. — Macg. Moll. Aberd. p. 258.— Reeve, 

 Conch. Systemat. pi. 66, f. 1,2, 3. — Sowerb. Conch. 

 Man.f. 110. 

 „ sulcata, Macgilliv. Moll. Aberd. p. 250.— Brit. Marine Conch, p. 247. — 

 Phil. Neuer Conch. Astarte, vol. ii. p. 56, pi. 1, f. 4. 

 Crassitie erassatelUe, Chenu, Traite Elem. f. 232, 233. 



* Da Costa's name has been preferred, not so much for its priority, as that, 

 tjirough its adoption, we are enabled to include under one epithet botli Hcoticu 

 and the subsequent Danmoniensis. 



