TETHYS—POLYNESIAN. 95 
This small sized species is especially remarkable for its short form, 
extremely swollen back, acute tail and short anterior portion. The 
foot is very broad and spreading in front, thick and rugose. The 
swimming lobes are narrow and close on the back, and do not cover 
it entirely. The opercle or mantle is quite large and oblong. 
T. PEASE! Pilsbry, n.n. PI. 25, fig. 2. 
Animal oblong, slender, smooth, dorsal region much elevated, 
convex in outline, gradually sloping posteriorly to the termination 
of the foot, anteriorly abrupt ; neck long ; cervical tentacles slender, 
long and cylindrical; labial tentacles large, moderately dilated. 
Siphon large, erect. Color pale fawn, mottled with darker, and 
covered with minute crowded white and very light purple dots; 
under portion of the body, edges of the mantle and labial tentacles 
margined with dark slate color. (Pse.). 
When in confinement it adhered with considerable tenacity to the 
jar by the hinder portion of the foot. (Pse.). 
Huahine, Society Is. (Pse.). 
Syphonota punctata Psr., Amer. Journ Conch., iv, p. 77, pl. 9, f. 2 
(1868). Not Aplysia punctata Cuvier. 
The size is not stated by Pease, but judging from his figure it is a 
small, long-tailed form with long excurrent siphon. ‘The shell is 
undescribed. 
T. KERAUDRENII Rang. PI. 39, figs. 1, 2, 3, 4. 
Length 15 em. Oblong, very much swollen, not much elongated 
forward, acute behind ; swimming lobes very large ; opercle [mantle] 
vast, oblong, with a very distinct tube in the middle; the siphon 
long and open lengthwise. Smooth and greenish-brown with large 
irregular and close black spots. Anterior tentacles wide with wavy 
borders, posterior tentacles conic. 
Shell large, oval, not very concave, elongate, much narrowed be- 
hind, the sinus long and rather shallow ; apex triangular, recurved 
and thick ; calcareous layer quite thick. Color brown-yellow above, 
white below. Length 48 mill. 
Tahiti ( Otaheite), Society Is. (Lesson). 
Aplysia keraudrenti Rana, Hist. Nat. Aplys., p. 59, pl. 138.—Lxs- 
son, Voy. autour du Monde, ete., La Coquille, Zool., ii, pt. 1, p. 294.-— 
Not Syphonota keraudreni Anaas, P. Z.8., 1867, p. 228. 
