614 KEPORT— 1863. 



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

 Schizothcerus) 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 thii'd, which may be Dr. Gould's sup- 

 pressed nasida. 

 13G. Riieta vndulata. This remarkable reverse of the Atlantic R. canalicidata 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 veiy distinct species were found 



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

 Panama. 



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

 13(1. Bulla Quoyii. S. Diego. Maz. Cat. no. 226. 



140. Tnoicutella Calif or nica. S. Diego. 



141. AoitfPa rosacea. Monterey to S. Diego. This shell is named />?7eo/«s, Midd., 



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

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

 Col. Jewett, but referred to Panama. 



142. Amphithalanms inchisus. S. Diego. [Several specimens of th-s minute but 



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

 collections.] 



143. Mi/urella 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 he the young of a 

 Gulf species. 



144. Volrarina varta. S. Diego, Cat. Is. [Sta. Barbara, Je??Wi ; also C. S. Lucas."] 



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



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



The infoi-mation 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 Cabforniensis. " 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 corrwfata, rtifescens, and Kamtschatkana. It is not yet 

 ascertained whether they aue hybrids or a distinct species. 



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

 Conception." 



*' ? Serpulorhis sqnamir/erus. Common south of Pt. Conception ; has no 

 operculum." [The young begins like V. anellum, Morch.] 



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

 Farallones. [ = Planaxis riif/rifella, Newcomb, MS.; non auct.] 



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

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

 O bcetica.'] 



** Nassa tnterstriata, Conr., foss. (?= N. pavpera, Gld.) ; resembles N. fossntn, 

 Gld { = B. elec/a/is, Rve.*), but distinct. Common south from Sta. Barbara." 

 [Probably =N. perpint/uis, Hds. N. pavpera is quite distinct, =JV. striaiOf 

 C. B. Ad., teste Cuming.] 



*' Fissurella inolacea I have seen from Catalina Is." [Esch.'s shell is o-enerally 

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



Acm(C(B. ' With regard to limpets and other variable shells, Dr. C. writes:— 

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

 more compelled to believe that hybrids are very frequent between allied 



• l^assa elegans was first pubUshedj by J. Sowerby, in the Min. Conch. 1824. 



100 



