113 Mollusc A of the Gulf of Mexico 82 



Genus SIMNIA Risso 



(Neosimnia) intermedia Sowerby, Spec. Conch., No. i, p. 9, f. 32, 

 33, (as OvuluDi), Thes. Conch., Ovulum, No. 40, p. 479, pi. 

 100, f. 61, 62, 1848; Reeve, Conch. Icon., Ovulum, pi. 7, f. 

 33a. b, 1865; Tryon, Man., 7, p. 251, pi. 3, f. 85-86, (as 

 Ovnla); Ball, Bull. M. C. Z., 18, p. 235, 1889; Bull. 37, U. 

 S. N. M., p. 134, '89. 



Distribution. — Hatteras to Brazil. Gulf coast, Vera Cruz. 

 15-170 fms. 



(Neosimnia) uniplicata Sowerby, Thes. Conch., p. 478, pi. 100, f. 

 30-32, 1848, (as Ovuiupi);'Reeve, Conch. Icon., Ovuhim, -pi, 

 9, f. 51a, b, 1865; Trj^on, Man., 7, p. 254, p] 5, f. 39, 40, 

 '85; Ball, Bull. 37, p. 134, '89; Bull. 112, U. S. N. M., p. 

 139, 1921. 



Ovuhim subrostratuyn Sowerby, 1848, antillarum and arcua- 

 lufnKeQve, 1865. carolinensis Moerch, 1877. 



Amphiperas canadieyisis Moerch, 1882 (typ. err. for carolinen- 

 sis). 



Bistribution. — Hatteras to Barbados and West Florida. 12- 

 121 fms. Also Pacific coast, San Pedro, Cal. to Lower Cal- 

 ifornia. 



Genus CYPHOMA Bolten 



gibbosa Unn^us, Syst. Nat., ed. X, p. 726 1758, {2iS Bulla); 

 Reeve, Conch. Icon., 15, pi. 7, f. 32, 1865, (as CM^/ww); 

 Tryon, Man., 7, p. 250, pi. 3, f, 81, 82, 1885; Ball, Bull. 37, 

 U. S.N. M.,p. 134, '89; Ball and Simpson, Bull. U. S. Fish 

 Com., I, p. 420,1901, (as Ultimus). 



Distribution. — Georgia to Trinidad, 15-50 fms. Also West 

 Florida. 



