THE NAUTILUS. 127 



Pomattopsidce. 

 Pomatiopsis lapidaria Say. 



Corbiculada. 



Musculium elevatinn Hald. 

 Pisidum virginicum Say. 



NEW CALIFORNIAN MOLLUSCA. 



BY WM. II. DALL. 



During the later portion of the life of the late W. C. Goforth, lie 

 paid much attention to the natural history of the places in California 

 which he visited, and made some collections which were transmitted 

 to the U. S. National Museum after his death l>y a relative, Mrs. 

 Emma C. Ingersoll. Among them were two or three small speci- 

 mens of shells, supposed to have been collected at Monterey. Curi- 

 ously enough, one of these specimens represents a species hitherto 

 undescrihed, and which it gives me pleasure to name in honor of the 

 regretted collector. 



Aesopus goforthi Dall, n. sp. 



Shell smooth, slender, elongate, with inconspicuous sutures and 

 about eight whorls; nucleus defective, smooth; subsequent whorls 

 gradually increasing, moderately convex; color greenish-waxen with 

 flammules of dark chestnut so arranged on the last whorl as to form 

 two irregular bands, one above and the other below the periphery, 

 which also show in the interior of the aperture and on the base of the 

 pillar; the paler portion of the surface is also irregularly mottled 

 with opaque whitish blotches. Aperture short, rather wide; the 

 outer lip simple, sharp, smooth within ; body and pillar smooth, 

 with a thin wash of callus ; canal short, wide, not recurved. Length 

 of shell 13, of last whorl 6, of aperture 4 mm., max. diam. of shell 

 3.3 mm. 



Type No. 249H24, U. S. N. Museum. 



While destitute of the spiral sculpture which maiks many species 

 of the genus, it ; s not without smooth congeners as, for instance, 



