CLASS PELECYPODA 
165 
nearly the whole of the basal part is coincident with the line of the basal 
attachment of the mantle; the hinge plate is broad and subtriangular quite 
strong, bearing one prominent grooved tooth between two channels; 
behind the posterior channel, in the left valve, is a much narrower, obscure, 
and little-raised tooth; the corresponding second tooth in the right valve 
is anterior and similarly obscure; the left valve is destitute of lateral 
teeth, but in the right valve there is a short, strong, elevated, subtriangular, 
anterior lateral close to the anterior cardinal, and a more distant and feeble 
posterior lateral over the posterior adductor scar. 
Length, 48; height, 28.5; diameter, 8.5 mm. of which 5 mm. is com¬ 
prised in the left valve. (Dali.) 
Type in U. S. N. M. Type locality, Long Beach, California. 
Range. Santa Barbara Islands to San Diego. In the Pleistocene at 
Santa Monica and San Pedro. 
Subgenus Arcopagia Leach, 1827. 
SECTION MERISCA Dali, 1900. 
Tellina lamellata Carpenter, 1857. 
Mazatlan Cat., p. 37, No. 58. 
A beautiful little shell, very flat, thin, white, transparent; cardinal and 
lateral teeth moderately strong; spaces between the lamellae smooth; 
outline oval very regular except where the umbos project; flexure wanting. 
It might have been the young of T. lira, but for the entire absence of the 
stout umbonal ridge of that species. Length, 1; height, .13. (Carpenter.) 
Type locality, Mazatlan, Mexico. 
Range. San Diego, California, to Mazatlan, Mexico. 
Tellina declivis Sowerby, 1868. 
Conch . Iconica, 17, sp. 261; pi. 44, fig. 261. 
Shell white, smooth, inflated, subtrigonal; anterior side inflated, dorsal 
margin sloped, rather convex, and rounded, posterior side cuneate, sub¬ 
compressed, radiately angular, slightly rostrated, dorsal margin much 
sloped, end truncated, acuminated below, margin excavated before the 
angle, umbones subcentral, elevated, obtuse. (Conch. Iconica.) 
Type in Museum Hanley. Type locality not given. 
Range. Catalina Island, California, to Panama. 
Subgenus Moerella Fischer, 1887. 
Tellina salmonea Carpenter, 1864. 
Plate 44, figs. 3a, 3b. 
Suppl. Rep. Brit. Assoc., p. 639. Conch. Iconica, 17; pi- 29, fig. 155. 
Shell small, solid, polished, subcuneated, equivalve, very little flexuous, 
whitish, salmon tinted within; posterior side very short, with dorsal 
