93 MOIXUSCA OF THE GlJEF OF MEXICO 6 1 



Distribution. — Lat. 38 0 29' N., south to Yucatan straits, Gulf 

 of Mexico, 856-1582 fms. Also off France, 820 fms. 

 granulosa (Jeffreys) Monterosato, Jour, de Conchy., 22, 1874, 

 (as Axinus); Dall, Proc. U. S. N. M., 23, p. 785, 1901. 

 Distribution. — Gulf of Mexico to St. Lucia, W. I., 60-116 fms. 

 Also Mediterranean and off Canaries, 

 pyriformis Dall, Bull. Mus. Conip. Zool., Harvard Coll., 12, p. 

 267, 1886. 



Cryptodon f obesus Dall, Idem, 9, p. 136, '81. Not obesus of 

 Verrill, Amer. Jour. Sci., 3, p. 287, pi. 7, f. 2, i8j2=tri- 

 sinuata d'Orbigny, 1846. 

 Distribution. — Carolina to Florida. 85-731 fms. Gulf of Mex- 

 ico, Yucatan Strait, 640 fms. A thinner, natter and less 

 earthy shell than that of T. obesus {—trisi?iuata) . 

 Genus ERYCINA Lamarck 

 floridana Vanatta, Proc. Acad. Nat. Sci., Phila., vol. 55, p. 758, 

 f. 2, 1903. 



Distribution. — West Florida at Crooked Island, Calhoun Co. 

 Genus ROCHEFORTIA Velain 

 planuIataStimpson, Shells of New England, p. 17, 1851, (as Kel- 

 lia); Verrill, Inv. Vineyard Sound, p. 688, pi. 30, f. 6, 

 '73 ; Dall, Bull. 37, U. S. N. M., p. 48, '89; Pr. U. S. N. 

 M., 21, p. 890, (as Mysella); Tr. W. I. S., 3, p. 1161, 

 pi. 45, f. 7, 1900. Johnson, Occ. Papers, Bost. Soc. Nat. 

 Hist., 7, p. 66, 1915. 

 Montacuta bidentata Verrill and Bush, Proc. U. S. N. M., 

 20, p. 779, pi. 93, f. 7, 8, pi. 94, 6, '98. Not bidentata 

 Montagu, 1803. 



Distribution. — Maine to Hatteras. Variety fragilis Verrill 

 and Bush, (Proc. U. S. N. M., 20, p. 780, pi. 92, f. 8, '98), 

 Narragansett Bay, R. I., and Corpus Christi, Tex. Plio- 

 cene : Caloosahatchie marl, Fla. 



Genus MONTACUTA Turton 

 floridana Dall, Proc. U. S. N. M., 21, p. 893, pi. 87, f. 10, 1899 ; 

 Tr. W. I., 3, p. 1x74, 1900; Vaughan, Publ. 133, Carn. 

 Inst., p. 171, 19x0. 



