ARCA. 233 



Mouths of the Niger. Adanson. Red Sea. Forskael. Cey- 

 lon. Gronovius. Islands of France, Bourbon, and Mada- 

 gascar. Bruguiere. Naples. Ulysses. West Indies. Hum- 

 phreys. 

 Shell about two inches long, and rather more than three inches 

 broad ; white tinged with pale flesh colour at the summits, 

 and coated with a brown hairy epidermis; there are about 

 thirty-six rounded longitudinal ribs, and the anterior end is 

 produced, compressed, and slightly angulated ; the inside is 

 white, and marked with shallow longitudinal grooves. Kaem- 

 merer erroneously considered Chemnitz's fig. 549. to be a 

 variety of A. rhomb ea. Area scapha of Gmelin is wrongly 

 named, for it is A. scaphiuncula and not A. scapha of Gro- 

 novius, and is too uncertain a species to be retained. 



granosa. 18. Shell somewhat heart-shaped, ven- 

 tricose, thick, with strong nodulous longitu- 

 dinal ribs ; apices remote and recurved ; mar- 

 gin crenated. 



Area granosa. Linnaus Syst. Nat. p. 1142. Chemnitz, 

 vii. p. 219. t. 56. f. 557. Schroeter Einl. iii. p. 268. 

 Gmelin, p. 3310. Bruguiere Enc. Meth. p. 104. 



Lister Conch, t. 241. f. 78. and t. 242. f. 79- Rumphius, 

 t. 44. f. K. Petiver Amb. t. 17. f. 7. Gualter, t. 87- 

 f. E. Argentille, t. 27. f. C. Klein Ost. t. 10. f. 45 

 and 46. Knorr, vi. t. 34. f. 2. Favanne, t. 51. f. C 1. 

 Enc. Meth. t. 307. f. 1. 

 Inhabits the coasts of Campeachy. Lister. Southern Europe. 



Linnaus. Tranquebar, and the Nicobar Islands. Chemnitz. 



Italy, Tuscany, and the Antilles. Bruguiere. 

 Shell an inch and a half, or two inches loug, and the breadth 



nearly the same ; almost equilateral, white, and coated with 



a brown epidermis, which it is difficult entirely to remove ; 



it has about twenty-five longitudinal ribs, armed with round 



somewhat spinous nodules, and crossed by fine transverse 



striae. 



rhombea. 19. Shell heart-shaped, with longitudi- 

 nal transversely striated ribs ; apices remote, 

 and the intervening space rhomboidal. 



Area rhombea. Born Mus. p. 90. Chemnitz, vii. p. 211. 



t. 56. f. 553, a and b. Bruguiere Enc. Meth. p. 105. 

 Area rhomboidea. Gmelin, p. 3314. 



