imen shows obscure, revolving, impressed lines below the swell of the body 

 whorl ; size quite uuiform. Long. .26 ; lat. .09 inch. 



Habitat. — Todos los Santos Bay, Lower California, where several specimens 

 were obtained by Mr. Hemphill, for whom J have named this well marked 

 species. 



MuRiciDEA suBANGULATA, Stcams. Plate I, fig. 4. 



Shell small, abbreviated fusiform, dingy white and marked spirally by an in- 

 conspicuous band formed of three reddish-brown lines more or less interrupted 

 on the basal and the preceding volution ; whorls five, angulated above and on 

 the basal whorl rounded below the angle, with a shallow sulcation beneath ; 

 surface covered with rounded and irregular costie, which are inconspicuous or 

 obsolete on the upper whorls ; longitudinally marked with from seven to nine 

 irregular rounded ribs, which at the edge of the angle (which is somewhat car- 

 inated) are broken into angular or pointed knobs or blunt spines ; aperture 

 ovate, angulated above and white within ; the outer lip with five or six tuber- 

 cles internally ; canal moderately prolonged, slightly curved and open in the 

 two specimens before me. Dimensions of largest : Long. .89 ; lat. .41 inch. /, 



Habitat. — San Miguel Island, off the southern coast of California, where the 

 specimens from which this description is made were obtained by Mr. W. G. W. 

 Harford . 



AsTYRis VARiEGATA, Steams. Plate I, fig. 5. 



Shell small, elongated, acutely conic, light rufous-brown or sienna-yellow un- 

 der a thin brownish or greenish epidermis ; with whitish median and sutural 

 bands more or less interrupted ; in some specimens these bands are connected 

 by waved lines of a darker brown ; surface of shell when free from epidermis, 

 smooth and shining, marked with delicate incremental lines, and on the lower 

 portion of the body whorl with narrow grooves; apex rounded, whorls seven, 

 convex ; suture well defined, aperture ovate, about one-third the length of the 

 shell ; outer lip simple, in some specimens a little thickened with small tubercles 

 on the inner side. 



Dimensions : Long. .3 ; lat. .12 inch. • ., 



Habitat. — San Diego, California, where numerous specimens were collected 

 by Henry Hemphill, Esq. This beautiful species resembles some forms of NtH- 

 della and Truncarin ; it differs from Astyris fuberosa, in the greater convexity of 

 the whorls, and especially in being without the angularity or concavity which 

 is displayed in the lower part of the body whorl in the latter species ; it is a 

 more delicate and graceful shell than either of the other forms of Astyris found 

 on the coast, many of which have been distributed as "Amycla" or " Colnmbella" 

 gausapata, Californiana, carinata, and var. Hindsii. 



Pholas Pacifica, Stearns. Plate I, figs. 6, 6a, 6b, 6c. 



P. Pacifica, Stearns, Prel. Descr. August 28, 1871. 



Shell oblong, beaks two-fifths of length of shell from anterior end ; anterior end 

 of valves triangular, pointed ; anterior dorsal edge of valves reflected and folded 

 down on the umbos ; lower anterior margin curved, forming a large elliptic-oval 



