614 
No. 
156. 
137. 
138. 
159. 
140. 
141, 
142. 
143. 
144. 
145. 
REPORT—1868, 
attends their identification. Dr. Cooper found very large valves (resembling 
Schizotherus) 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 nasuta. 
Raéta undulata. This remarkable reverse of the Atlantic BR. canaliculata is 
also confirmed by rare valves from the S. Diegan district. It is not con- 
gone with Harvella elegans, to which it bears but a slight external resem- 
ance. 
Tapes tenerrima. Large dead valves of this very distinct species were found 
mae the Standelle, and confirm Col. Jewett’s young shells described as from 
anama. 
Pecten paucicostatus. Sta. Barbara Is. [Described from Col. Jewett’s valves. | 
Bulla Quoywt. 8. Diego. Maz. Cat. no. 226. 
Truncatella Californica. 8. Diego. 
Acmea rosacea. Monterey to 8. Diego. This shell is named prleolus, 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. Je ewett, but referred to Panama. 
Amphithalamus inclusus. §. Diego. [Several specimens of this minute but 
remarkable new genus confirm a solitary shell in Col. Jewett’s mixed 
collections. | 
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. 
Volvarina varia. 8. Diego, Cat. Is. Re Barbara, Jewett; also C.S. Lucas. ] 
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 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 Californiensis. “This form is so rare that I think it only a var. of 
Cracherodi.” 
Haliotis, Several specimens from the Farallones present characters inter- 
mediate between corrugata, rufescens, and Kamitschatkana. It is not yet 
ascertained whether they are hybrids or a distinct species. 
“ Tivona 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. anellum, Morch. | 
Macron lividus. Point Loma, 8. Pedro, common; extends northwards to thé 
Farallones. [= Planazis nigritella, Newcomb, MS.; non auct. | 
“ Olivella semistriata, Gray, fide Newe., is a species found N. of Monterey only.” 
ae Dr. faba species is from Panama, that of Newcomb is probably 
O. beetica. : 
“ Nassa interstriata, Conr., foss. (P= N. paupera, Gld.) ; resembles NV. fossata, 
Gld. (=B. elegans, Rve.*), but distinct. Common south from Sta. Barbara.” 
Probably =. perpinguis, Hds. N. paupera is quite distinct,= N. striata, 
. B. Ad., teste Cuming. ] 
“ Fissurella violacea I have seen from Catalina Is.” { Esch.’s shell is generally 
considered S. American. ? May Dr. Cooper’s be a form of Seat 
Acmee. 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 
* Nassa elegans was first published, by J. Sowerby, in the Min. Conch. 1824. 
