614 IIEPORT 1863. 



B 



attends their identification. Dr. Cooper found very large valves (resembBriff 

 Schizothcerits) in abundance, but much deformed by the entrance of sand, and 

 apparently killed by the fresh waters of the great flood. The large shells 

 belong to two very distinct species, which are probably those of Conrad ; 

 among the small shells is perhaps a third, which may be Dr. Gould's sup- 

 pressed nasitta. 



136. Raeta undulata. This remarkable reverse of the Atlantic R. canaliculata is 



also confirmed by rare valves from the S. Diegan district. It is not con- 

 generic with Harvella elegans, to which it bears but a slight external resem- 

 blance. 



137. lapes tenerrima. Large dead valves of this very distinct species were found 



with the Standellce, and confirm Col. Jewett's young shells described as from 

 Panama. 



138. Pecten paucicostatus. Sta. Barbara Is. [Described from Col. Jewett's valves.] 



139. Bulla Quoyii. S. Diego. Maz. Cat. no. 226. 



140. Tnmcatella Californica. S. Diego. 



141. Acmfea rosacea. Monterey to S. Diego. This shell is named pileolus, Midd., 



in Mus. Cuming, but does not agree with the diagnosis. It can hardly be 

 distinguished from Herm specimens of A. virginea. It was first brought by 

 Col. Jewett, but referred to Panama. 



142. Ampliithalamus inclusus. S. Diego. [Several specimens of this minute but 



remarkable new genus confirm a solitary shell in Col. Jewett's mixed 

 collections.] 



143. Myurella simplex. Very variable in sculpture, as befits the species which 



forms the northern limit of a group common between the tropics. Col. 

 Jewett's shell was in poor condition, and supposed to be the young of a 

 Gulf species. 



144. Voharina varia. S. Diego, Cat. Is. [Sta. Barbara, Jewett ; also C. S. Lucas.] 



145. Nassa Coopcri, Fbs. S. Diego, Cat. Is. [This Kellettian shell has a double 



right to its name, now that Dr. Cooper has ascertained its habitat.] 



The information on station, &c., which Dr. Cooper has sent with regard to 

 previously known species, will be found incorporated in the general table of 

 the fauna. The following notes, extracted from his letters, are too valuable 

 to be omitted : 



Haliotis Cahforniensis. " This form is so rare that I think it only a var. of 

 Cracherodii" 



Haliotis. Several specimens from the Farallones present characters inter- 

 mediate between corrugata, rufescens, and Kamtschatkana. It is not yet 

 ascertained whether they are hybrids or a distinct species. 



" Livona picoides I have not found, though I have seen fresh ones from Pt. 

 Conception." 



" ?Serpulorbis squamigerus. Common south of Pt. Conception; has no 

 operculum." [The young begins like V. artettum, Mb'rch.] 



Macron lividm. Point Loma, S. Pedro, common ; extends northwards to the 

 Farallones. [ = Planaxis niaritella, Newcomb, MB.; non auct.] 



tl Olivella semistriata, Gray, fide Newc., is a species found N. of Monterey onlv." 

 [As Dr. Gray's species is from Panama, that of Newcomb is probably 

 O bcetica.'] 



"Nassa interstriata, Conr., foss. (?= N. paupera, Gld.) ; resembles N. fossata, 

 Gld. (=J3. ekgans, Rve.*), but distinct. Common south from Sta. Barbara." 

 [Probably N. perpinguis, Hds. N. paupera is quite distinct, = N. striata, 

 C. B. Ad., teste Cuming.] 



t{ Fissurella wolacea I have seen from Catalina Is." [Esch.'s shell is generally 

 considered S. American. ? May Dr. Cooper's be a form of volcano. .] 



Acmcea. With regard to limpets and other variable shells, Dr. C. writes : 

 a From my examination of large numbers of specimens, I am more and 

 more compelled to believe that hybrids are very frequent between allied 



* 2iassa elegan* was first published, by J. Sowerby, in the Min. Conch. 1824. 



100 



