59 MOLLUSCA OF THE GuLF OF MEXICO 27 



Pedcu ziczac Reeve, Conch. Icon. Pcden, pi. 6, fig. 29 ; 

 Dall, Bull. 37, U. S. N. M., p. 32, '89 ; Trans. Wagner 

 Inst., 3, pt. 4, p, 694, '98. 

 Distribution. — Tampa to Guadelou])e. 



Subgenus CHLAMYS Bolten 

 exasperatus Sowerby, Thes. Conch., i, ]). 54, pi. iS, f. 1S3-186, 

 '43; Reeve, Conch, Icon., 8, pi. 2, f. 7, 8, '52; Dall, 

 Bull, 37, U. S. Nat. Mus., p. 34, '89. 

 fuscopnrpuretis Q.o\\x2A, J. A. N. S. Phila., pp. 209, 280, pi. 

 39, f. 10, '49. 

 Distribution. — Hatteras to Guadeloupe. Pliocene to Recent. 

 Gulf of Mexico : Charlotte Harbor, 13 fms, Yucatan 

 Strait 640 fms., Tampa (type \oc2X\\.\ oi fttscopnrpureus) . 

 Pliocene : Caloosahatchie. 

 ornatns Lamarck, An. s. Vert., 6, p. 176, 1819 ; Reeve, 

 Conch. Icon., 19, f. 68, '53 ; Dall, Bull. 37, U. S. Nat. 

 Mus., p. 34, '89 ; Trans. Wagner Inst., 3, pt. 4, p. 743, 

 1898. 

 Distribution.— N. Carolina to Brazil. Gulf. — Off Cedar Keys, 

 50 fms. 

 (Nodipecten) nodosus Linnaeus 



Ostrea nodosa Linn., Syst. Nat. ed. X, p. 697, 1758. 



Peden coralli7ius Ch&van . Conch. Cab. 7, p. 306, pi. 64, figs. 



609-11, 1784. 

 fragrostis Conrad, Jour. Acad. Nat. Sci., Phila., 2d Ser. i, 



p. 214, pi. 39, f. II, 1849. 

 nodosus Dall, Trans. Wag. Inst. Sci., 3, pt. 4, p. 728, 1898 ; 

 Mitchell, List Texas Shells ; Maury. Bull. Amer. Pal. No. 

 29, p. 186, 1917. 

 Distribution. — Antilles and Gulf of Mexico. \'ariety /"ra^v^- 

 sus, Cedar Keys. Pliocene : Caloosahatchie. 



(Plagioctenium) gibbus Linnaeus 



Ostrea gibba Linn. Sy.st. Nat., ed. X, p. 698, 1758. Not of 



Born 1780. 

 Peden dislocatus vSay, Jour. x\cad. Nat. Sci., Phila., 2, ]). 

 260, 1822. 



