92 TETHYS-POLYNESIAN. 



outer lip anteriorly obliquely produced ; dorsal and inferior mar- 

 gins very obliquely sloped forwards. (Sowb.). 



Sandwich Is. (Pse.). 



Syphonota bipes PEASE, P. Z. S., 1860, p. 23. Aplysia bipes SOWB. 

 Conch. Icon., xvii, pi. 6, f. 26a, b. 



This species contracts itself when handled so as to form a ball. 

 The young are subpellucid. The hinder part of the foot is evidently 

 used as a sucker, by which the animal suspends itself. (Pse.). 



T. SANDVICHENSIS Sowerby. PI. 20, figs. 46, 47. 



Shell obliquely oblong, arched, ivory, brown towards the edges, 

 white within, apex elevated, very little incurved ; upper margin 

 sloped downwards, deeply excavated, angular at the end ; outer lip 

 roundly produced below ; dorsal margin convex, inclined towards 

 the outer lip below, widely excavated. (Sowb.'). 



Shores of Sandwich Islands (Cuming). 



Aplysia sandvichensis SOWB., Conch. Icon., xvii, pi. 4, f. 14a, b 

 (August, 1869). 



" Much more arched than Aplysia tigrina." But it may be only 

 the shell of a fully adult T. bipes Pease. 



T. GRANDIS Pease. PL 20, figs. 40, 41. 



Body long, smooth, elevately rounded above and rather compressed 

 along the sides. Mantle lobes thin, rounded, much dilated and 

 strongly undulated along the margins. Dorsal tentacles rather 

 large, pointed, dilating outwards and grooved. Oral tentacles 

 grooved, about same size as the dorsal, with a furrow extending from 

 beneath the right one along the neck and terminating in the back 

 between the mantle lobes. Foot elongate, narrow, corrugated, and 

 projecting posteriorly, where it is rounded. The siphonal tube is 

 on the posterior lateral portion of the back, canaliculated and curved, 

 and extending above the back. Shell large, covered by a thin mem- 

 brane, ovately rounded, thin, fragile, with rugose lines of growth, a 

 deep rounded sinus on the right side near the apex. Apex small 

 and callous. Color purplish-brown, pale along the flanks, every- 

 where above densely crowded with minute white dots, which on the 

 sides are arranged in circular clusters forming spots. Foot pale. 

 The young are of a very pale color. (Pse.). 



