BERTINIA. 189 
the margins of the shell. Interior straw yellow, shading toward the 
margin into a bluish-white. Length 1°3, width 1:1, alt. °5 inch. 
(Gabb.). 
Santa Barbara Island, California, on the shore (Dr. Cooper). 
Tylodina (?) fungina Gass, Proc. Cal. Acad. Sci., iii, p. 188 
(1865). 
Soft parts unknown. The above measurements are approximate, 
making allowance for the epidermis which in the dry specimen is 
contracted and incurved around the margins to a width of about a 
tenth of aninch. A singie specimen, fresh, though without the 
animal, was found by Dr. Cooper. (Gabb). 
Tylodina excentrica Locard= Gadinia. 
Insufficiently known or spurious species. 
Genus Bertinia Jousseaume, 1883. 
Bertinia Jouss., Bull. Soc. Zool. France for 1885, 3d. pt., p. 194 
(type B. bertinia Jouss., |. ¢., pl. 10, f. 6, 8). 
Shell calcareous, limpet-like, oval, with thin edges and subcentral 
summit inclined toward the shorter end of shell, which is nail- 
shaped, with muscular impression within. Soft part unknown. 
(Jouss.). 
This shell must have much resemblance to a worn Helcioniscus 
toreuma or nigrolineatus (see MANUAL, vol. xill, p. 135), with the 
periphery broken down to the muscle impression, and with the out- 
side worn. Can the learned Doctor have been deceived? 
B. bertinia Jouss. (Pl. 71, figs. 68, 69). Shell ovate-oblong, 
patelliform, convex outside, the vertex excentric, bent toward the 
anterior side; white and nail-shaped in front, with an impressed 
muscle scar; the anterior surface, as well as the lateral notches, 
smooth and shining, colored yellowish-brown toward the summit, 
nacreous white toward the borders, as if the anterior part had been 
buried in the tissues of the animal nearly to the apex, while behind 
it was joined at the edges only. _Posteriorly rounded and smooth, 
with fine lamellose growth-lines toward the summit, a little swollen 
and shining; its color of a yellow-orange white, is masked toward 
the summit by a wide spot of deep brown, which emits rays nearly 
to the periphery of the same color, more or less long, and quite 
widely spaced. The interior, which is concave, smooth, shining 
