CLASS PELECYPODA 
131 
low, pustular, the prodissoconch very small but distinct. Length, 4; 
height, 3.5; diameter, 1.5 mm. (Dali.) 
Type in U. S. N. M., No. 194339. Type locality, Santa Rosa Island, 
California. 
Range. Known only from the type locality. 
Genus KELLIA Turton, 1822. 
Shell small, thin, suborbicular, closed; beaks small; margins smooth; 
ligament internal, interrupting the margin, or on the thickened margins; 
cardinal teeth; 1 or 2 laterals 1-1 in each valve. (Tryon. S. S .Conch.) 
Type. My a sub orbicularis Montagu. 
Distribution. Norway, New Zealand, California. 
Range in time. Eocene, Pleistocene. 
Kellia laperousei Deshayes, 1839. 
Plate 10, fig. 2, and plate 33, fig. 4. 
Rev. Zool. Soc. Cuvierienne, p. 357. Guerin, Mag. de Zool., Moll.; pi. 12, figs. 5, 6. 
Shell of medium size, suborbicular, convex thin; umbones slightly 
anterior, not prominent; surface sculptured by fine incremental lines which 
are slightly variable as to prominence; no lunule; each valve with one very 
prominent cardinal tooth; right valve with • two posterior laterals, left 
with one; hinge area lacking between cardinal and lateral teeth; muscle 
impressions not distinct. Length, 23; height, 19; diameter, 11 mm. 
(Arnold.) 
Type locality not given. 
Range. Bering Sea and Pribiloff Islands to San Diego, California. 
In the Pliocene at San Pedro and the Pleistocene at San Pedro and San 
Diego, California. 
Kellia suborbicularis Montagu, 1804. 
Test. Brit., p. 39; pi. 26, fig. 6. 
Mya with a sub-pellucid, sub-orbicular shell, of a yellowish-white 
color, frequently covered with a brown epidermis; faintly striated trans¬ 
versely, somewhat glossy; margin opposite the hinge nearly straight; 
sides nearly equal, rounded; hinge central; beaks small, pointed, turning 
to one side; in one valve a single tooth immediately under the beak, locking 
into a double one in the opposite valve; with a laminated tooth behind 
the beak in each, somewhat remote. Inside glossy white; valves shut close. 
Length rather exceeding % of an inch; breadth, % inch. (Montagu.) 
Type in British Museum. Type locality, Plymouth, England. 
Range. Bering Island, the Aleutians, and south to Panama. Also 
Atlantic. In the Pleistocene at San Pedro, California. 
