CLASS PELECYPODA 
69 
Modiolus capax Conrad, 1837. 
Jour. Acad. Nat. Sci. Phila., 7:242. Conch. Iconica, 10:3; fig. 11. 
Shell much inflated; anterior margin slightly retuse in the middle; 
umbo broad; summit obtusely rounded; posterior margin salient in the 
middle; epidermis chestnut brown, fibrous at base; within bluish, tinged 
with yellow. Length, 3 inches. (Conrad.) 
Type in Phila. Acad. Nat. Sci.? Type locality, San Diego, California. 
Range. Santa Barbara, California, to Payta, Peru. 
Modiolus fornicatus Carpenter, 1864. 
Suppl. Rept. Brit. Assoc., p. 643. Ann. Mag. Nat. Hist., (3) 15:178. 
M. testa curta, lsevi, latiore, maxime fornicata; pallide carnea, epider- 
mide rufo-fusca, rugis incrementi et incrustatione densissime pilosa induta; 
umbonibus maximis, spiralibus, antice torsis, per tres quadrantes totee lati- 
tudinis devectis; area ligamentali curtissima, arcuata; margine dorsali 
antice nullo, postice longo, arcuato; margine ventrali recto, vix propter 
byssum hiante; postico lato, antico angusto; altitudine dorsaliter valde 
elevata, ventraliter plane declivi, cuneiformi; umbonibus trans marginem 
anticum per sextantem totius longitudinis excurrentibus: intus, sub um¬ 
bonibus excavata; cicatr. adduct, ant. ventraliter sita. (Carpenter.) 
Shell of medium size, short, oblong, inflated in front, swollen, equi- 
valve; beaks anterior, not quite terminal, obtuse, marginal, bent forward; 
surface sculptured only with concentric, incremental lines; margins 
smooth; no hinge teeth. Length, 31; height, beaks to ventral margin, 54; 
diameter, 30. (Arnold.) 
Type in Mrs. Boyce Collection, Utica, New York. Type locality, 
Santa Barbara, California. 
Range. Monterey to San Pedro, California, and Cortez Bank, Lower 
California. In the Pleistocene at San Pedro, Ventura and Santa Barbara, 
California. 
Modiolus politus (Verrill, 1880, var.?) pallidulus Dali, 1916. 
Proc. U. S. N. M., 52:405. 
Shell thin, smooth, brilliantly polished, attenuated anteriorly, wide and 
bluntly rounded behind, divided into two color areas, the dorsal large, 
translucent with a whitish, zigzag reticulation, the ventral opaque white 
with a yellowish tinge; hinge edentulous, margins entire. Length, 23; 
maximum height, 11.5; beaks behind the anterior end, 1; diameter, 5 mm. 
(Dali.) 
Type in U. S. N. M., No. 212746. Type locality, off San Luis Obispo 
Bay, California. 
Range. Off Bodega Head, California, to Cerros Island, Lower Cali¬ 
fornia. 
