NO. 1177. NORTH AMERICAN LEPTONACEJ—DALL. 885 



small, and delicate; adductor scars high up, the anterior narrow and 

 longer, the posterior larger and rounded; exterior with a very thin, 

 ])ale straw-colored epidermis, and faint incremental sculpture, the sur- 

 face apparently smooth but under the microscope minutely sagrinate. 

 Lon. 8, alt. 5, diam. 2.5 min. 

 A single left valve was dredged as stated. 



SPORTELLA CALIFORNICA Dall. 



Sportella californica, new species. 



(Plate LXXXVIII, fig. 5.) 



B. 3. Shell small, compressed, rude, with a yellowish epidermis; 

 slightly arcuate, dorsal margin evenly arched, base concavely arcuate; 

 inequilateral, the anterior part longer, rounded, the posterior end more 

 blunt; teeth normal, the larger right cardinal nearly parallel with the 

 dorsal margin, the ligamentary nymph obscure, the attachment for the 

 resilium thickened and projecting; scar of the mantle wide and some- 

 what irregular, the anterior adductor scar not well distinguished from 

 it. Lon. 6, alt. 4.2, diam. 1.5 mm. 



A single rather worn right valve was collected on the beach at Mon- 

 terey, California, by Dall in 1860. 



SPORTELLA STEARNSII Dall. 



Sportella stearnsii, new species. 



(Plate LXXXVII, tigs. 9, 12.) 



B. 4. Shell of moderate size for the genus, inequilateral, not very 

 convex, white, with an almost imperceptible yellowish epidermis; ante- 

 rior dorsal margin nearly straight, the base parallel with it, the ends 

 bluntly rounded ; surface nearly smooth, with faint incremental lines 

 and microscopic sagrination; teeth normal, strong, the posterior car- 

 dinal prominent, vertical; ligament strong, external, on a nymj)h; resil- 

 ium well developed, its area of attachment thickened; posterior 

 adductor scar rounded, unusually large. Lon. 13.5, alt. 10, diam. 5 mm. 



One well preserved specimen from the Gulf of California, exact 

 locality unknown, is contained in the Stearns collection. 



ANISODONTA CORBULOIDEA Dall. 



Anisodonta corbuloidea, new species. 



(Plate LXXXVIII, fig. 2.) 



A. 0. Shell small, glassy white, rather compressed, very inequilateral, 

 anterior side short, comprising about the anterior fourth of the shell, 

 bluntly rounded; beaks distinct, dorsal margin nearly parallel with the 

 base; posterior end obliquely rounded-truncate to a point near the 

 base from which an obscure ridge extends to the beaks; nymph for the 



