ON MOLLUSCA OF THE WEST COAST OF NORTH AMERfCA. Ca5 



In his " Synopsis of the Genera Parapholas and I'tutteUa ,''' from the saiue 

 eource, p. 335, are given as synonyms — 



Piirapliolas Califoniica, Conr., =^Fholns C, Conr., =P/iohis Jmielli, Desli. 

 PcniU'Ua Conradi, Val., =P/i(das pi^tiifo, Conr., ^Pliolas concunncrnta, Desh. 

 Peiiitella melcmtira, Sby., ==^Penitella Wilsoni, Conr. (not Putapl.o'uA lisiilaila). 



In the elaborate but somewhat intricate " Monoi^raph of the Order Phnla^ 

 dacea" tfec., by G. W. Tryon. jun., Phihidelphia, 18G2, the following sjiecies 

 are quoted from the West Coast, and form the conclusion of the marine shells 

 hitherto described, so far as known to the writer : — 



Page. 



49. PoceJlaria [Gastrochcpna] ovnfa, Sby. Panama, W. I., and Charle.>ton, Stimp- 

 son. " Not the slightest ditference between the Pacific and Atlantic speci- 

 mens." 



74. Pholas ( Cyrtopleurd) frimcata, Say. Massachusetts ; S. Carolina ; Payta, Peru, 

 PHSchenherfier ; Chili. 



77. Dadylina (Gitocentrum) CJnloensis, King-, 1832, = P/(. laqmata, Sby., 1849. 

 Peru, Chili [Panama, Jeivett]. Scarcely diil'ers from D. Campechensu,— 

 Ph. obloiif/afa, Sav, =Ph. CancJeaim, D'Orb. ; Southern U. S., W. I. 



82. Narea siihy'lohnsa. Gray, Ann. N. H. 1851, vol. viii. p. 385. California. [" In 

 a hole in a shell. Cabinet Gray." Neither shell nor authority stated.] 



85. Pltoladidea (Hatasia) melaniira, Sby. Lower Ca\iiormii,=: Penifella WilsonUf 

 Com-., J. A. N. Sc. Ph., fig. 4 (non 5). " This error in figuring led J3r. 

 Gray to misunderstand both the species and Conrad's idea of the genus 

 PeniteUa:' [ Vide Brit. Assoc. Pvep. 1856, p. 265.] 



87. Penitella penifa. [Mr. Tryon erroneously quotes (Netastoma) Danvinii, as 



well as Ph. cornea, as synonjnns.] 



88. Jonannetia (Pholadojms) pectimifa, C onr., = Trtomphalia pidcherrima, Sby. 



" California " [no authority], W. Columbia. 

 127. " Pholas refifer, Morch, Mai. Blatt. vii. 177, Dec. 1860. One brolcen right 

 valve. Hub. Real Llejos." = DactyUna {Gitocentrum) Chiloensis, King [teste 

 Tryon]. 



112. The following Table contains a complete list ot all the Molluscs which 

 have been identified, from Vancouver Island to S. Diego, arranged so as to 

 show at the same time their habitat, and the principal collectors who have 

 obtained them. The species in the fii'st column were obtained by Prof. 

 Nuttall; in the second, by Col. Jewett. The third column (marked E A.) 

 contains the species tabulated from other sources in the First Kepoit. Those 

 to the right of the double column are the fresh explorations recorded in this 

 Supplementary Report. The fourth column contains the shells brought by 

 the Pacific Railroad Expeditions, as well as the species sent to the oflicers ot 

 the Smithsonian Institution by the Rev. J. RoweU and their various corre- 

 spondents. The fifth column (' Ken.') contains the species of the American, 

 and the sixth (' Lord ') of the British Nort/i Pacific Boundary Survey. The 

 seventh records the collections of Mr. Swan and his Indian children ; the 

 last, those of Dr. Cooper in the Californian Geological Survey. As a largo 

 proportion of the species are as yet unknown, and the diagnoses will be found 

 scattered in various periodicals, some of which are rarely accessible in this 

 country, it has been judged needful to add a few words of description, with 

 references to well-known books. By this means the student will have beforo 

 him a compact handbook of the fauna, and will distinguish at a glance tho 

 range of localities, and the amount of authority for each. For the full 

 •ynonjTny, the previous pages of the two Reports must be consulted, 



121 



