232 ARCA. 



the striae are much stronger on the anterior than on the pos- 

 terior side; the summits are recurved, and a little distant 

 from each other ; hinge elongated and oblique. This species 

 has much the habit of a Mytilus. 



concamerata. 1(3. Shell rhombical-heart-shaped, 

 truncated and gaping at the anterior end, and 

 the inside furnished with an ear-shaped ap- 

 pendage ; hinge with two teeth at each end. 



Area concamerata. Martini Besch. Berl. Naturf. iii. p. 292. 

 t. 7- f- 15 and 16. 



Area cucullata. Chemnitz, vii. p. 174. t. 53. f. 526 to 528. 



Area Cucullus. Gme/in, p. S3 1 1 . 



Area labiata. Solanders MSS. Portland Cat. p. 185. lot 

 3947. 



Area concamera. Bruguiere Enc. Meth. p. 104. 



Cucullcea auriculifera. Lamarck Syst. des Anim. p. 11 6. 



D'Avila, t. 18. f. V. Favanne, t. 51. f. A. Enc. Meth. 

 t. 304. 

 Inhabits the coasts of the Nicobar Islands. Chemnitz. 

 Shell about two inches and a quarter long, and three inches and 



a quarter broad ; of a reddish brown colour, and the inside 



often tinged with violet ; it is marked with strong longitudinal 



and minute transverse striae; an internal ear-shaped appendage, 



and two rather large teeth at each end of the straight crenated 



hinge readily distinguish this species. 



antiquata. 17. Shell obliquely heart-shaped, with 

 rounded slightly wrinkled longitudinal ribs ; 

 apices remote and recurved; margin cre- 

 nated. 



Area antiquata. Linnceus Syst Nat, p. 1141. Born Mm. 

 p. 90. Schroeter Einl. iii. p. 266. Gmelin, p. 3409. 

 Bruguiere Enc. Meth- p. 103. 

 Area scapha. Gronovius Zooph. p. 274. t. 18. f. 13. 

 Chemnitz, vii. p. 201. t. 55. f. 548 and 549. Ulysses's 

 Travels, p. 489- 

 Bonanni Rec. and Kirch. 2. f. 74. Lister Conch, t. 230. 

 f. 64 a, and t. 236. f. 70. Rumphius, t. 44. f. I. Pe- 

 ttier Amb. t. 17- f. 8. Gualter, t. 87. f. B and C. Adan- 

 son Senegal, t. 18. f. 7. Knorr, i. t. 21. f. 3 and 4. Enc. 

 Meth. t. 306. 

 Inhabits the coasts of Jamaica. Lister. Malacca. Rumphius. 



