ON MOLLUSCA OP THE WEST COAST OF NORTH AMERICA. 635 



In his " Synopsis of the Genera Parapholas and I'enitella," from the same 

 Boiirce, p. 335, are given as synonyms — 



ParapJiolas Californica, Com'., =Pholas C, Conr., '=Pholas Janelli, Desh. 

 Penitdla Conradi, Val., =Pholas penita, Conr., ^Pholas concamerata, Desh. 

 Penitella melanura, Shy., =Pemtella Wilsoni, Conr. (not Parapholaa bisulcatd). 



In the elaborate but somewhat intricate " Monograph of the Order Phola- 

 dacea," &c., by G. W. Tryon, jun., Philadelphia, 1862, the following species 

 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. Xocellaria [Gastrochesna] ovata, Sby. Panama, W. I., and Charleston, Stimp- 

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

 mens.'' 



74. Pholas (Cyrtopleura) truncata,Sa,j. Massachusetts ; S. Carolina; Payta, Peru, 

 Ru^chenherger ; ChUi. 



77. Dactylina (Gitocentrum) Chilo'ensis, King, 1832, = P/j. laqueata, Sby., 1849. 

 Peru, Chili [Panama, Jetoett]. Scarcely differs from D. Campeeliensis,= 

 Ph. ohlongata, Say, =PA. Candeana, D'Orb. ; Southern TJ. S., W. I. 



82. Navea subglobosa, Gray, Ann. N. H. 1851, vol. viii. p. 385. California. ["In 

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



85. Pholadidea (Hatasia) melanura, Sby. Lower California, = Pe««feHa Wihonii, 

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

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

 Penitella." IVide Brit. Assoc. Rep. 1856, p. 265.] 



87. Penitella penita. [Mr. Tryon erroneously C[uotes (JNetastoma) Darwinii, as 



well as Ph. cornea, as synonyms.] 



88. Jmmmietia (Pholadopsis) pectinata, Conr.,= Trioniphalia pulcherrima, Sby. 



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

 127. "Pholas retifer, Mbrch, Mai. Blatt. vii. 177, Dec. 1860. One broken right 

 valve. ^o6. EealLlejos." = Dactylina (^Gitocentrum) CAitoe»«js, King [teste 

 Tryon]. 



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

 have been identiiied, 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 first column were obtained by Prof. 

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

 contains the species tabulated from other sources in the Pirst Eeport. Those 

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

 Supplementary Eeport. The fourth column contains the shells brought by 

 the Pacific EaUroad Expeditions, as well as the species sent to the ofiicers of 

 the Smithsonian Institution by the Eev. J. EoweU and their various corre- 

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

 and the sixth (' Lord ') of the British North 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 before 

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

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

 synonymy, the previous pages of the two Eeports must be consulted. 



121 



