209 



4. MONOGRAPH OF THE ShELLS COLLECTED B\ T. NuTTALL, 

 ESQ., ON THE CaLIFORNIAN CoAST, IN THE YEARS 1834-5. 



By Philip P. Carpenter. 



The following shells were collected by Mr. Nuttall at various sta- 

 tions from Oregon to San Diego. Most of them were deseribed by 

 T. A. Conrad iii the Journal of the Academy of Natūrai Sciences of 

 Philadelphia, vol. vii. part ii. 1837 (Read, Jan. and Feb. 1837). This 

 paper is accompanied by four coloured platės ; but the descriptions 

 are in English. References are now giveu as far as known, and descrip- 

 tions of a few overlooked species. The types are destined ultimately 

 for the British Museum, where many of them are already to be 

 found. They are at Mr. Nuttall' s residence, Nut Grove, near Rain- 

 hill, Lancashire. Severai of the species are only known by references 

 in the Catalogue of Dr. Jay's Collection, U. S. A. 



Philip P. Carpenter. 



Bristol, June 1856. 



Genus Parapholas, Conr. 



" Testą Pholadiformis ; marginihus dorsalibus supra valvis lafe 

 expansis ; valvis accessoriis ii., subcequalibus, elongatis, altera 

 ab umbone ad marginėm posticum directa, altera ad basim 

 affixa ; area cardinali solida ; cicatr. muse. adduct. valde 

 elongatis. 



" Distinguished by the accessory valves, which appear soldered to 

 the shell, elongated muscular irapressions ; form of the pallial sinus 

 and valve on the base." — Journ. 1849, p. 214. 



It is difficult to know what limits Conrad intended for this genus. 

 It is used in the B. M. Maz. Cat. for tlie tripartite Pholadidece with 

 persistent cups, on the authority of Woodward's Manual ; but Con- 

 rad uses it, besides the following species, in Journ. Jan. 1850, for 

 Pholadidea melanura, which he calls Parapholas bisulcata ; while 

 the Parapholas acuminata (vide B. M. Maz. Cat. p. 12, no. 18) he 

 calls Penitella JVilsonii *. 



— 1. Parapholas Californica, Conr. 



Pholas Californica^ Conr. Journ. p. 236. pi. 18. f. 5, 6 ; Sow. Thes. 

 Conch. in loc. 



=Pholas Janellii, Desh. Rev. Zool. 1839, teste Gould. 



Parapholas Californica, Conr. Journ. 1849, p. 214. 



Hab. Sta. Barbara, rupibus argillaceis. Mus. Nutt., Cum., Brit., 

 Jay. 



* In the sarae paper is deseribed a genus Solecardia (species) ebumea ; and 

 theii occur the following additional synonyins : — 



Petricola sinuosa, Conr. = P. robusla, Sow. 



Pholadopsis pectinata, Conr. = Triomphalia, sp., Sow. 



Triton perforatus, Conr. = T. Chemnitzii, Oray = Argobitccintim nodo- 



gum, Cheran. 

 Oliva propatula, Conr. = O. iesiacea, Lam. 



No. CCCXIV. — Proceedings of the Zoological Society. 



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