146 MOLI.USCA OF THE GUI.F OF MEXICO I16 



3, '15; Mauiy, Bull. Anier. Pal., No. 29, p. 133, pi. 23, f. 



7- 1917- 

 agglutinans Lamarck. 



Distribution. — Hatteras to the Antilles. Gulf of Mexico, 

 West Florida and dredged at various stations, 14-229 fius. 

 Usually not so deep as X. caribaea and more heavily loaded. 

 Pliocene, Caloosahatchie beds, West Fla. Lower Miocene, 

 Chipola marl, W^est Fla. Oligocene, Tampa silex beds, Fla. 

 Upper Eocene, Jackson, Miss. Eocene, Wood's Bluff, Ala. 

 Upper Cretaceous, (Ripley) of Prairie Bluff, Ala. The 

 most ancient species of the Gulf Mollusca. 



caribaea Petit, Jour, de Conch., 5, p. 248, pi. 10, f. i, 2, 1856; 

 Tryou, Man., 8, p. 162, pi. 47, f. 96, '86; Ball, Bull. M. C. 

 Z., iS, p. 291, '89; Ball and Simpson, Bull. U. S. Fish 

 Com., I, p. 438, 1901. 



Bistribution. — Hatteras to Barbados and Gulf of Mexico, 

 various stations, 14-274 fms. 



Genus NATSCA Scopoli 



livida Pfeiffer, Wiegm. Arch., 6, p. 254, 1840; Moerch, Malak. 

 Blatt., 24, p. 64, '77; Ball, Bull. M. C. Z., 18, p. 292, '89: 

 Bull. 37, U. S. N. M., p. 154, '89. 



jamaicensis C. B. Adams, Contr. Conch., p, iii. 1850. 



/>r<?.iVwa Sowerby, Thesaurus, Natica, pi. 8, f. iii. Not of 

 C. B. Adams. 



Bistribution. — Hatteras to Barbados. Gulf of Mexico, be- 

 tween the Mississippi delta and Cedar Keys, 26 fms. 



maroccana Chemnitz, Conch. Cab., 5, p. 270, pi. 188, f. 1905-10; 

 Billwyn, Cat. Rec. Sh., 2, p. 983, No. 13, 1817; Ball, Bull. 

 M. C. Z., 18, p. 292, 1S89; Bull. 37, U. S. N. M., p. 154, 

 1889. 



Bistribution. — Hatteras to Barbados and Gulf of Mexico, 

 west of Florida. Also European and West African. 



