23 BULIvETIN 38 • 53 



Bull. 37, U. S. N M., p. 88, 1889; Pilsbry, Man. Conch., i 

 ser.,15, p. 380, pi. 42, f. 19, 20, 1893. 



Distribution. — Guadeloupe (type locality), St. Thomas, W. 

 I.; Gulf coast at Cedar Keys, 2-95 fms. This species is the 

 genotype. 



Genus HYDATiNA Schumacher 



physis Linn^us, Sj^st. Nat., ed. x., p. 727, 1758, (as Bulla); 

 Ball, Bull. 37, U. S. N. M., p. 88, 1889; Pilsbry, Man. 

 Conch., ser. i, 15, p. 387, pi. 45, f. 14-17, 1893; Ball and 

 Simpson, Bull. U. S. Fish Com., i, p. 364, 1901. 



Distribution. — Atlantic, Pacific and Indian Oceans. Gulf 

 coast: Sarasota, West. Fla. 



Genus PHI LINE Ascanius 



flexuosa M. Sars, Nyt. Mag. f. naturvidens., 17, p. 181, pi. 11, f. 

 23-26; Christianiafjordens Fauna, pp. 69, 70, pi. 11, f. 23- 

 26; Dall, Bull. M. C. Z., 18, p. 59, 1889; Bull. 37, U. S. N. 

 M., p. 88, 1889; Pilsbry, Man. Conch., i ser., 16, p. 21, pi. 

 4, f, 86-89, 1896. 



Distribution. — Christiania,Norwa5^; Yucatan Strait, 640 fms. 



Genus TETHYS Linnaeus 



protea Rang, Hist. Nat. des Aplysiens, p. 56, pi. 10, f. 1-3,1828, 

 {as Aplj/sia) : d' Orbigny, Moll. Cuba, i, p. 117; Beau, Cat. 

 Coq. Guadeloupe, p. 20; Dall, Pr. U. S. N. M., p. 324, 

 '83; Pilsbry, Man. Conch., i ser. 16, p. 78, pi. 37, f. 20-22, 

 1895; Dall & Simpson, Bull. U. S. Fish Com. i, p. 365, 

 1 901. 



Distribution. — Florida to Carthagena, Columbia. Very 

 abundant in the Antilles. Gulf of Mexico, West Florida 

 (Dall). 



willcoxi Heilprin, Pr. A. N. S. Phila., p. 364, 1886, (as Aplj/sia) ; 

 Dall, Bull. 37, U. S. N. M., p. 90. '89; Pilsbry, Man. 



