TETHYS-AUSTRALASIAN. 99 



Aplysia tryonii MEINERTZHAGEN, Trans, and Proc. N. Z. Inst., 

 1879, xii, p. 271, 270 (1880). HUTTON, Tr. N. Z. Inst., xv, p. 118, 

 pi. 13, fig. A (Dentition). 



The formula of teeth given by Hutton is 13'1*13, an unusually 

 small number. In form, the teeth offer nothing especially charac- 

 teristic. 



T. HAMILTON: Kirk. 



Animal about 7 inches in length, 2? inches high, and weighing 

 14 oz. Color umber-brown, with fine irregular dark markings ; 

 lighter below. Shell ear-shaped, horny, firm, ribbed on left side, 

 irregularly concentrically striated ; epidermis bright straw color, 

 highly polished. Inside white, with a pearly luster. Length, 1*6, 

 breadth 1*45 inch. (Kirk.} 



Napier, New Zealand. 



Aplysia hamiltoni KIRK, Trans. N. Z. Inst., 1881, xiv, p. 283 

 (1882). 



T. TASMANICA Tenison-Woods. 



Shell thin, fragile, translucent, shiny, obliquely subquadrate, 

 slenderly concentrically striate, and transversely minutely sulcate, 

 subtestaceous within, slightly concave, enamelled, horny ; apex 

 scarcely incurved, with the upper margin arcuate and subreflexed, 

 lower margin oblique and straight, anteriorly produced and rounded. 

 Length 38, breadth 28 mill. (T.-W.~) 



Tasmania. 



Aplysia tasmanica T.-W., Papers and Proc. and Rep. Roy. Soc. 

 Tasm. for 1875, p. 156 (1876). 



A large form of talcous appearance, the margin becoming insensi- 

 bly membranaceous. It is somewhat similar in form to A. gigantea 

 of Sydney, but more oval, membranaceous, and smaller. (T.-TF.) 



T. NORFOLKENSIS Sowerby. PI. 59, figs. 42, 43. 



Shell horny, brown, arched, ventricose, obliquely subovate, thin, 

 smooth ; apex elevated, round, auriculated at the back ; upper mar- 

 gin sloped, excavated ; outer lip rather convex ; lower margin 

 rounded, dorsal margin arched, rounded, thinly reflected near the 

 apex, obliquely inclined towards the lower end. (Sowb.) 



"Norfolk Island, New South Wales" (Sowb.) ; Shark Island, Port 

 Jackson (Brazier). 



