408 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvi. 



North side Catalina Island, California, in 16 fathoms gravel and 

 sand; W. H. Dall. Cat. No. 163089, U.S.N. M. 



The species is viviparous; some of those taken having as many as 

 thirty young shells in the anal chamber. It is always distinguisha1)le 

 from Psej)his tantilla (Gould) Carpenter by its hinge and oval form, 

 and from P. lordi by its oval outline, compressed valves, and thinner 

 shell. Pf<ephh tellimyalia of Carpenter, 1861, is the nepionic young 

 of a species of Petricola, and his Psephis mhnonea bears the same rela- 

 tion to some other bivalve, apparently a species of Tivela, not T. 



sttdtoruiit. 



NOTES. 



Dfmnia amjuloxa Philippi, through having the name of the Chinese 

 province of Chi-li, latinized into clullenHe by Deshayes, has been erro- 

 neously supposed to extend its range to South America. 



The National Museum contains a valve of Doshria pr(>xtr<(t»i said to 

 have been dredged in the Gulf of California, but as the collector had 

 also visited and collected on the coasts of China and Japan, I suspect 

 a mixture of labels to be responsil)le for an obvious error. Clementia 

 graciUihia Carpenter, 1857, from Mazatlan, is an unidentifiable nepi- 

 onic shell, less than a tenth of an inch in length. 



The genus Glrce does not occur on the west coast of America; even 

 Gauldla, which might be expected, is unknown. Two shells described 

 as Circe margarita and C. siihtrigona by Carpenter, in 1857, from 

 Mazatlan, are nepionic shells, which are so juvenile in their characters 

 as to be impossible of identihcation at present. We may assume it to 

 be certain that they do not belong to the genus Circe. Circe nui/i- 

 midina Lamarck, 1818, was listed from Central America by Sir E. 

 Belcher, but his localities were notoriously not dependable. Cytherea 

 petechialis Lamarck, 1818, is listed by Carpenter from Mazatlan, hav- 

 ing been found among the Keigen shells, but it is certainly exotic, 

 none having appeared from there for half a century. Saxidoinus 

 hrevisiphonatus Carpenter, 1865 (and Darina declivis of the same 

 date), have never been collected since they were described from the 

 Vancouver region. I believe them to be exotics which were acciden- 

 tally mixed with West Coast shells. Specimens supposed to be the 

 Saxidomus, sent by West Coast collectors, have invariably proved to be 

 mutations of aS". glganteus. The name Saxidomus squalldus^ given to a 

 South American shell, probably a Ma/pcia, has been frequently applied 

 to the 8. giganteuf<, following an erroi* of Carpenter. 



