37 Bulletin 38 67 



havanensis Dall, Bull. M. C, Z., 9, p. 67, 1881; iS, p. 93, pi. 11, 

 f- 5, 'S9- 

 Distribution. — Yucatan Strait, 640 fms. Also off Havana. 



lithocolieta Watson, Jour. Linn. Soc, 15, p. 441, 1881; Chall. 

 Rept. Gastr. , p. 320, pi. 24, f. 6, 1S85 {-as Pleiiroioma); 

 Dall, Bull. M. C. Z., iS, p. 95, pi. 11, f. 6, '89; Bull. 37, p. 

 98, pi. II, f. 6, '89. 



Distribution. — Hatteras to Guadeloupe, W. I. Also Gulf of 

 Mexico between Mississippi delta and Cedar Keys, at 940 

 fms. 



Genus CYMATOSYRIMX Dall 



centimata Dall, Bull. M. C. Z., 18, p. 95, pi. 36, f. g, 1889; Bull. 

 37, U. S. N. M., p. 98, pi. 36, f. 9, '89. 



Distribution, — Hatteras and Gulf of Mexico, Lat. 24° N., 

 Lon. 84° W. at 1920 fms., and between Mississippi and 

 Cedar Keys at 1181 fms. 



moseri Dall, Bull. M. C. Z., 18, p. 97, pi. 36, f. 3, 1889; Bull. 

 37, U. S. N. M., p. 98, pi. 36, f. 3, '89. 



Distribution. — Cape Hatteras and Sarasota Ba\', West Fla. 



Genus PLEUROTOIVIELLA Verrill 



packardi Verrill, Am. Jour. Sci., (3) 5, p. 15, 1873; Tr. Conn., 

 Acad., 5, p. 453, pi. 43, f. 9, pi. 57, f. 5, '82. 



Distribution. — Gulf of Maine to Rhode Island. The variety 

 benedidiY. & S., (Dall, Bull. 37, U. S. N. M.,p. 102, pi. 

 14, f. 4, pi. 60, f. 70 a, '89) ranges from Gulf of Maine to 

 Bequia,i29o-i507 fms. Gulf of Mexico, West Florida region. 



leucomata Dall, Bull. M. C Z., 9, p. 63, 1881, {z.s Drillia); 18, 

 p. 120, pi. II, f. 13, '89; Bull. 37, p. 102, pi. II, f. 13, 

 1889. 



