TETHYS—ORIENTAL. 105 
The whole shell is laterally much curved. 
T. MARMOREA A. Adams. 
A large species, sometimes 10 inches long. Back elevated ; 
swimming lobes large, ample, marbled with green and white; an- 
terior tentacles very broad, truncate ; posterior tentacles sublinear, 
obtuse. Shell large, thin, fragile, much dilated in front; apex 
scarcely involute, somewhat thickened. (A. Ad.). 
Port Hamilton (Mah-lu Sau), tidal pools and taken in the seine 
(Ad.). 
Aplysia marmorea A. Ap., Annals and Magazine of Natural 
History, Series 3, viii, p. 140 (August, 1861). 
T. marcinaTa A. Adams. 
Back elevated ; swimming lobes large, dilated, white edged, and 
then with a brown margination; reddish-brown, variegated and 
dotted with brown. Anterior tentacles broad, short, truncate ; pos- 
terior small and subacute. Shell fragile, thin, semimembranous, 
subtriangular, dilated and rounded anteriorly ; apex scarcely invo- 
lute. (A. Ad.). 
Port Hamilton in rock pools at low water (Ad.). 
Aplysia marginata A. Av., Ann. Mag. N. H. (8), viii, p. 141, 
(Aug., 1861). 
T. rrmBpriAtTa Adams & Reeve. PI. 18, figs. 20, 21, 24. 
Anterior tentacles with a sinuous, fringed margin from the outer 
end to the head; posterior tentacles bent toward the apices, deeply 
slit. Obscure greenish, with very many eye-spots, with minute 
white pupils and brown irides; ornamented with black anastomos- 
ing lines and minute opaque white dots. (A. & R.). 
Shell oblong-subquadrate, pale, concentrically striped in every 
part, thin, subventricose, very thinly testaceous within, apex a lit- 
tle elevated, incurved, scarcely callous, upper margin slightly exca- 
vated, lineate at the end; outer lip rather straight, subquadrate at 
the end, dorsal margin convex, lower margin rounded. (Sowd.). 
Miyako-jima Island (Taipinsan or Typinsan of some charts), 
Further Loo Choo group. 
Aplysia fimbriata A. & R., Zool. Samarang, Moll., p. 63, pl. 17, 
fig. 2 (1848).—Sowersy, Conch. Icon., pl. 4, f. 12a b. 
Inner surface of foot, when seen expanded, marbled with black 
and white. This large and handsome species is remarkable for the 
