21 
205 Rissoina interfossa Cpr 
[Todos Santos. D.] 
206 Isapis fenestrata Cpr 
Specimens from among oyster shells below low water, off an 
old pile from San Diego bay. Also Todos Santos bay. Unalaska. 
207 Mesalia tenuisculpta Cpr 
San Diego. 
208 Bittium quadrifilatum Cpr 
San Diego. 
209 Bittium armillatum Cpr ; 
Abundant on sponges found during the spring on muddy flats, 
San Diego bay, at low water; dead ones abundant among worn 
shells. 
210 Cerithiopsis assimilata C B Adams 
San Diego. Not found alive. Monterey, Cal., to Panama. 
211 Czecum californicum Dall 
Cecum Cooperi Cpr. Suppl. Rep. Br. As. 1864, p. 655, not 
Czecum Cooperi Smith, Ann. Lyc. Nat. Hits. N. Y., pp. 154, 168. 
1862. 
San Diego. Cooper. Monterey, Cal., to Baja Cal. 
[The above synonymy shows that of the two species named 
C. Cooperi, that of Mr. Sanderson Smith has priority, and conse- 
quently the Californian species is the one which must take the 
new name instead of the New York form. Through a failure to 
observe this Dr. Cooper fell into the error of renaming C. Cooperi 
(New York) as C. Smithii (Proc. Phil, Acad. Nat. Sci. 1872, p. 
154). D.] 
212 Cecum orcutti 
[Shell small, stout, smooth, but not polished, light warm 
brown in color and without sculpture, except very slight lines of 
growth. Shell slightly curved, the anterior aperture very oblique, 
about at right angles to the plane of the diameter of the plug, the 
superior margin being the anterior; plug glandiform, smooth, 
roundel without mucro; operculum brown, thin, smooth. Lon. 
of shell. 2.00; diameter 0.75 mm. 
San Diego, Creutt, abundantly, under stones. 
This is the smallest and only smooth Californian species of 
the genus. Dall.] 
213 Jeffreysia translucens Cpr 
One specimen, San Diego. 
214 Barleeia haliotiphila Cpr 
San Diego. Rare. Monterey, Cal., to Baja Cal. 
215 Bithinella binneyi Trvon. 
Freshwater springs at Campo, San Diego County, California. 
216 ®Bithinella intermedia Tryon 
Freshwater springs on Cuyamaca Mountain, at a higher alti- 
tude than the last. 
