236 ARCA. 



senegalensis. 23. Shell ovate, with convex lon- 

 gitudinal ribs, and the inside striated ; mar- 

 gin crenated. 



Area Senegalensis. Gmelin, p. 3312. 



Area Robet. Bruguiere Enc. Meth. p. 107. 



Area, No. 35. Schroeter Einl. iii. p. 292. 



Le Robet. Adanson Senegal, p. 248. t. 18. f. 6. 

 Inhabits the coasts of Senegal, about the Mouths of the Niger. 



Adanson. 

 Adanson describes this species to be about eight lines long, and 



ten broad, and the depth of the two valves is about equal to 



the length ; the colour is white, sometimes tinged with red ; 



it has twenty-six convex longitudinal ribs, which are mostly 



smooth, but sometimes slightly wrinkled transversely, and the 



inside has twice as many longitudinal striae. 



lactea. 24. Shell sub-rhomboidal, diaphanous, 

 with obsolete decussated striae ; summits re- 

 curved and distant; margin entire. 



Area lactea. Linnaus Syst. Nat. p. 1141. Da Costa 



Brit. Conch, p. 171. t. 1 1. f. 5. Chemnitz, vii. p. 200. 



t. 55. f. 547. Schroeter Einl. iii. p. 265. Gmelin, p. 



3309. Montagu Test. p. 138. Donovan, iv. t. 135. 



Matonand Racket, in Lin. Trans, viii. p. 93. Dorset 



Cat. p. 36. t. 11. f. 5. Bruguiere Enc. Meth. p. 108. 

 Area barbata. Pennant Zool. iv. p. 98. t. 58. f. 59. 

 Area crinita. Solafider's MSS. Pulteneys Dorset Cat. 



p. 34. 

 Area nodulosa. Muller Zool. Dan. Prod. p. 247- ? 

 Area Afra. Gmelin, p. 3408. 

 Area, No. 36. Schroeter Einl. iii. p. 293. 

 Le Jabet. Adanson Senegal, p. 250. t. 18. f. 8. 

 Bonanni Rec. 2. f. 34. and Kirch, f. 33. Lister Conch, t. 



235. f. 69. Petiver Ga%. t. 73. f. 1. 

 Inhabits the Mediterranean. Linnaus. Adriatic. Bonanni. 

 Guernsey. Lister. Goree. Adanson. Britain. Pennant, fyc. 

 Shell about five or six lines long, and eight broad ; yellowish 

 white, covered with a brown epidermis, beneath which it is 

 marked with extremely delicate crowded deenssated striae. 

 Linnaeus has described the margin to be crenulated, but in 

 all other respects this shell agrees better with his description 

 than A. reticulata, which was arranged in the Portland Ca- 

 binet under this name. 



