104 TETHYS-ORIENTAL. 



in front; dorsal margin round, reflected, with a radiating groove. 



Zebu, Philippines (Cuming). 

 Aplysia cornigera SOWB., Conch. Icon., pi. 9, f. 40 (1869). 



The curved horn- like form and pointed apex distinguish this 

 prettily striped shell. ($.). 



T. FUSCA Tilesius. PI. 59, fig. 34. 



Length 9 cm., swollen, oblong, brown and spotted ; mantle with 

 the foramen radiated ; foot oblong, narrow ; swimming lobes mod- 

 erately ample ; tentacles folded as usual. Shell fragile, flexible. 



China, living on sea-weed, etc., along the shore. 



Aplysia fusca TILESIUS, in Krusenstern's Voyage around the 

 World in 1804-1806, p. ?, pi. ?. (Russian, 3 Vols. 4to, St. Petersb., 

 1809-1812, and Atlas in folio, 1813). RANG, Hist. Nat. Aplys., p. 

 65, pi. 18, f. 1. DESK, in Lam., An. s. Vert., vii, p. 696. 



I have not seen Admiral Krusenstern's Voyage, and have, there- 

 fore, given Rang's translation of the description and copied his re- 

 production of the original figure. The species resembles T. depilans 

 in having a large oval mantle orifice, with radiated borders. 



T. ORIENTALIS Sowerby. PI. 18, fig. 25. 



Shell ovate subtrigonal, rather solid, chestnut, tumid in the mid- 

 dle of the back, calcareous within ; apex elevated, biauriculated ; 

 upper margin sloped, scarcely excavated, obtusely angular at the 

 end ; outer lip rather straight above, rounded below ; dorsal mar- 

 gin straight, elongated ; lower margin round. (Sowb.\ 



Chinese Seas (Cuming). 



Aplysia orientalis SOWB., Conch. Icon., pi. 5, f. 18 a, b (1869). 



This shell nearly resembles Aplysia punctata in form, although 

 less triangular. It has a slight bluish tint in coloring. 



T. SINENSIS Sowerby. PI. 18, figs. 26, 27. 



Shell thin, hyaline, arched, quadrate, concentrically finely ridged ; 

 apex nearly terminal, small, biauriculated ; upper margin straight, 

 arched, obtusely angular at the end ; outer lip a little convex, dor- 

 sal margin reflected, sloped below. (Sowb.). 



Chinese Seas (Cuming). 



Aplysia sinensis SOWB., Conch. Icon., pi. 7, f. 29a, b (1869). 



