102 TETHYS-AUSTRALASIAN. 



taceous ; apex elevated, incurved, with a small callus, widely re- 

 flected ; upper margin sloped downwards, arched, excavated,, 

 rounded at the end ; outer lip anteriorly sinuously produced, dorsal 

 margin obliquely arched, excavated. (Soivb.) 



The lower part of the dorsal margin, corresponding with the 

 canal in spiral shells is much excavated. This is the species to 

 which was first applied by Pline the name of Lepus marinus or Sea 

 Hare. (Sowb.*) 



Middle Harbor and Coodgee Bay, Port Jackson (Angas). 



Aplysia ligrina Rang, ANGAS, P. Z. S., 1867, p. 228. SOWERBY,. 

 Conch. Icon., xvii, pi. 2, f. 5 (1869). Not A. tigrina Rang. 



The shell is longer, with shorter sinus than that of the true tigrina. 

 Sowerby's acute remark that this species is the Lepus marinus of 

 Pliny must be taken for what it is worth. I support it only to the 

 extent of agreeing that the animal is at all events a Lepus marinus. 



T. GIGANTEA Sowerby. PI. 58, figs. 28, 29. 



Shell large, expanded, convex, obliquely subquadrate, greenish- 

 brown, concentrically undated and minutely striped, within a little 

 testaceous, very pale rose ; apex elevated, very little incurved, up- 

 per margin wide, lightly arched, excavated ; inferior margin oblique,, 

 not excavated, anteriorly obliquely produced. (Sowb.} 



Swan River (Cuming). 



Aplysia gigantea SOWB., Conch. Icon., pi. 1, fig. la, b (Aug., 

 1869). 

 T. DENISONI Smith. 



Body (in spirit) high, exhibiting a distinct pedal disk, produced 

 posteriorly into a caudal termination. The entire surface wrinkled,, 

 dirty-whitish, black-veined in the wrinkles (? stains only). Mantle- 

 lobes moderately large, commencing in front, some distance behind 

 the posterior tentacles and terminating a little in advance of the 

 cauda. Anterior tentacles large, cylindrical, with the apical slit 

 not extending half way down the outer side, placed a little nearer 

 the oral tentacles than the beginning of the mantle lobes. Eyes 

 minute, situated near the outer anterior base of tentacles. 



Shell very thin, straw color, 30 millim. long and 27 broad. 



Animal about three inches in length in its contracted state 

 (Smith.*) 



Port Denison, Queensland (Coppinger) 



Aplysia denisoni SMITH, Zool. Coll. H. M. S. Alert, p. 89 (1884). 



