23 BUI.I.ETIN 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 

 genot3'pe. 



Genus HYDATINA Schumacher 



physis Linnaeus, S3-st. Nat., ed. .v., p. 727, 1758, {siS 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. 



Bistribution. — 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. it, f. 

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

 26; Ball. 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. 



Bistribution. — Christiania, Norway ; Yucatan Strait, 640 fms. 



Genus TETHYS Linnaeus 



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

 {a.s Aplysia): d' Orbigny, Moll. Cuba, i, p. 117; Beau, Cat. 

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

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

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

 1901. 



Bistribution. — Florida to Carthagena, Columbia. Very 

 abundant in the Antilles. Gulf of Mexico, West Florida 

 (Ball). 



willcoxi Heilprin, Pr. A. N. S. Phila., p. 364, 1886, (as Aplysia)\ 

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



