66 MOLLUSCA OF THE GuLF OF MEXICO 



ihea Dall, Pr. U. S. N. M., 6, p. 32S, pi. 10, f. 5, 18S3; Bull, M. 

 C. Z., 18, p. 91, '8g; Bull. 37, U. S. N. M., p. 98, pi. 48, 

 f. I, '89. 



Distribution. — Hatteras to Florida Kej^s, and West Florida 

 at Cedar Keys, 3-15 fms. 



Note. — The variety <rar;«/«?/ra Dall (Bull. M. C. Z., 18, p. 

 91, 1S89) was dredged in Gulf of Mexico, U. S. Fish Com. 

 Station 2402 at 1 1 1 fms. 



Simpsons Dall, Pr. Davenport Acad. Sci., 5, p. 54, 1887, (as 

 Plcuroto)na)\ Bull. M. C. Z., i8, p. 91, 1889. 



Distribution.— Hatteras to Tampa Bay, West Florida, 15- 

 18 fms. 



lissotropis Dall, Bull. M. C. Z., 9, p. 58, Ang. i38i; 18, p. 91, 

 pi. II, f. 3, 4, 1889; Bull. 37, p. 98, pi. II, f. 3, 4, '89. 



hypsela Watson, Jour. Linn, Soc, 15, p. 433, Oct. 18S1; Chall. 

 Gastr., p. 341, pi. 21, f. 4, 1885. 



Distribution. — Gulf of Mexico, West of Florida at 220 fras. 

 Also Antillean. Variety perpoliia Dall (Tr. W. Inst., 3, p. 



36, '90), Caloosahatchie Pliocene. 



dalli var. cestrota Dall, Bull. M. C. Z., 18, p. 92, 1889; Bull. 



37. P- 98, '89. 



Distribution. — Between the Mississippi delta and Cedar 

 Keys, at 196 fms. Typical dalli Verrill, ranges from 

 Martha's Vineyard to Delaware Bay. 



nucleata Dall, Bull. M. C. Z., 9, p. 62, 'Sr; 18, p. 92, pi. 11, f. 



1, 1889. 



Distribution. — Gulf of Mexico, 229-339 fms. Also Antillean. 

 Pleiirotoma amblia Watson may be a synonjmi. 



verrilli Dall, Bull. M. C. Z., 9, p. 68, 1881: 18, p, 93, pi. 11, f. 



2, 1889; Bull. 37, p. 98, pi. II, f. 2, '89. 



Distribution. — Gulf of Mexico, West of Florida, 220-3 10 fms. 



