126 THE NAUTILUS. 



already been named C. zonaria by Gmelin (1791). Our shell being 

 nameless, I propose to call it G. annettne. 



CTPR^A CAPUT-DKACONIS Melvill, lives on the reefs at Easter 

 Island and the locality " Hong Kong " is probably erroneous. 



CTPR^EA MEXIOANA Stearns, is omitted by Hidalgo. 



TRIVIA CALIFORNIANA Gray, (1828) was inaccurately mono- 

 graphed by Reeve under the name of T. calif ornica ; which, having 

 been inadvertently adopted in Carpenter's British Association re- 

 ports, has been more or less commonly in use ever since. 



TRIVIA COSTISPTNCTATA Gaskoin, 1870, reported from Cali- 

 fornia, if correctly located, is probably only a mutation of T. radians 

 Lamarck. 



TRIVIA SOLANDRI Gray, and CTPR^EA SPADICEA Swainson, are 

 reported from Vancouver Island by Hidalgo, but his authority was 

 doubtless inaccurate, as neither species is known north of latitude 

 34 30' N., and even T. californiana is not yet reported north of 

 Bodega Bay in latitude 38 15'. 



It is much to be desired that Californian naturalists will deter- 

 mine from the living animals whether the important differences 

 stated to exist between Trivia and Cyprcea are really as stated ; 

 since, if confirmed, the two genera can hardly be retained in the 

 same family. 



Erato is not included in Hidalgo's lists, though so closely related 

 to Trivia; but I may add that since describing E. albescens in 1905 

 (NAUTILUS, xviii, p. 124) the details of the station have come to 

 hand and it seems that the type specimen was dredged in 30-41 

 fathoms, sand, off the western Santa Barbara Islands, California. 



BIFIDABIA BILAMELLATA STERKI AND CLAPP, N. SP. 



BY V. STERKI. 



Shell small, slender, cylindrical or slightly attenuated above, with 

 an obtusish apex, perforate; whorls 5^, subequal, the apical ones 

 comparatively large; colorless to pale or reddish-horn, 1 transparent; 

 surface shining, with very fine, crowded, subregular striae, on the 

 apex microscopically rugulose; the last whorl ascending above, some- 

 what flattened at the base close to the aperture, keel-like further 



1 So far aa can be seen from drift specimens. 



