TETHYS—POLYNESIAN. 93 
Shell somewhat talon-shaped ; oblique, arched, brownish-green, 
subpellucid ;. apex very elevated, acuminated, subauriculated ; upper 
margin much sloped, excavated, outer lip rounded; lower margin 
rounded ; dorsal margin convex, subangulated. (Sowb.). 
Sandwich Is. (Pease). 
Syphonota grandis Psx., P. Z. S., 1860, p. 23.—Aplysia grandis 
Sows., Conch. Icon., pl. 8, f. 34a, b. 
This species was found gregarious on a rocky bottom. They 
generally carry the mantle lobes expanded, spreading open and ex- 
posing the shell and branchis. When confined in a glass jar, they 
used the posterior portion of the foot as a sucker, suspending them- 
selves from the glass, although there was no division of the foot, as 
in the preceding species. (Pse.). 
T. ELONGATA Pease. PI. 59, figs. 35, 36, 37, 38. 
Length (of alcoholic specimens) about 2 em. Form oblong, 
smooth. Back elevated, so much so as to give it a slightly com- 
pressed appearance. Mantle lobes strongly dilated and undulated, 
and free nearly the whole length of the back. Dorsal tentacles 
rather slender, and ear-shaped; anterior pair large and dilated. 
Foot narrow and terminating in a point posteriorly, which projects 
beyond the back. Color of a darker or lighter brown, which color 
is most intense on the top of the head and neck, The whole dorsal 
region is clouded and minutely speckled with white. The shell is 
distinctly defined in the living animal being covered with a thin 
translucent membrane. (Pse.). 
Swimming lobes narrow, membranous, united for a short distance 
behind. Mantle having an extremely large oval foramen; excised 
and lobed behind. Genital pore and groove as usual. 
Shell extremely large for size of the animal, moderately solid, buff 
outside; calcareous layer nearly as extensive asthe cuticular. Very 
convex, the apex incurved, bearing a wide, reflexed and adnate callous 
hood. Sinus very deeply concave and short. Length 113, breadth 8 
mill. 
Sandwich Islands (Pse.; Townsend). 
Siphonota elongata Psx., P. Z. S., 1860, p. 24.—Marr. & LANGE. 
Donum Bismarckianum, p. 54, pl. 5, f. 6. 
This seems tu be a species allied to 7. punctata and parvula, hav- 
ing the shell of the same convex form, although provided with a 
