82 TETHYS-ANTILLEAN. 



This form differs from T. willcoxi in lacking the characterises 

 pattern of dark marking, and in the longer excision or sinus of the 

 shell. The animal colors the alcohol in which it is preserved green. 

 The single specimen was found alive at Cape May in October, 1894. 



T. CAILLETI Deshayes. 



Nearly as large as A. depilans. Irregularly marbled with green- 

 ish-brown, very sombre, on a ground of white washed with brown- 

 reddish ; the free edges of the mantle [swimming lobes] bordered 

 with a wide zone of the same color but paler. (Desk., Journ. de 



Conchy!., 1857, p. 140.) 



Guadeloupe (Schramm). 

 No other information has been published on this form. 



T. BRASILIANA Rang. PI. 38, figs. 3, 4, 5. 



Length 11 to 13 cm. Very much swollen, elongated in front, 

 somewhat shortened behind, carrying the mantle far back. Tube of 

 the mantle quite ample and conspicuous. Swimming lobes very 

 large. Color deep brown. 



Shell oblong, of a dark yellow color, the apex little developed ; 

 posterior sinus almost wanting. 



Bay of Rio Janeiro, abundant (Quoy & Gaimard). 



Aplysia brasiliana RANG, Hist. Nat. de Aplysiens, p. 55, pi. 8, f. 

 1-3 (1828). 



Rang's figures and description which I give above are evidently 

 from alcoholic specimens. He writes : Two quite remarkable char- 

 acters distinguish A. brasiliana from the other species : first, the 

 front part, is much lengthened, and the posterior part is rather 

 short ; and second, the opercle [mantle] is placed far toward the 

 hind end, and consequently obliquely towards the tail. To these 

 characters we may add the color of the lobes, which is a dark 

 brown, and the form of the posterior tentacles which are perfectly 

 conical, while the others are much widened. The lobes are ample 

 and long and the opercle quite large. The shell, too, is distinct ; it 

 is of an oblong shape, and an obscure-yellow color ; its lower sur- 

 face is covered by a quite thick calcareous layer, the apex is little 

 formed, and there is almost no sinus. The type is Aplysia No. 11, 

 of the anatomical cabinet of the Garden of Plants. 



T. FLORIDENSIS Pilsbry, n. sp. PI. 37, figs. 15, 16, 17, 18, 19. 



Length about 9 cm. Body rather short, with short tail. Head 

 lobes broad and triangular, the mouth parting their lower median 



