THE 
TELLINA.—Puare VII. 
tico brevi, subacuminato, costd umbonali reflexd et de- 
flexd, termino subrostrato, subtrilobato, maryine dorsali 
recto, valde declivi, elongato, latere antico tumido, ele- 
vato, margine dorso-laterali rotundatim aut subqua- 
dratim convexo, margine ventrali medio rectiusculo, 
utringue sursum acclivi, umbonibus elevatis, dentibus 
lateralibus nullis. 
DELTOID TeLLINA. Shell subtrigonal, white, solid, 
smooth, inequivalve, inequilateral, posterior side short, 
somewhat acuminated, reflected and deflected by an 
umbonal rib, slightly beaked and trilobate at the 
termination; dorsal margin straight, very sloping, 

long, anterior side tumid, elevated, the dorso-lateral 
margin roundly or rather squarely convex, ventral 
margin nearly straight in the middle, on both sides 
sloping upwards, umboes elevated, lateral teeth none. 
Lamark, Anim. sans vert., Tellina, no. 49. 
Tellina lactea, Quoy et Gaimard. 
Hab. Australia. 
The squareness of the anterior side and the strong pos- 
terior slopes give to this shell the deltoid appearance 
whence it derives it name. Variety Fig. a shows the ex- 
treme degree of this peculiarity, while some specimens are 
even rounder than variety Fig. 4. 

