OX MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 635 



In his " Synopsis of the Genera Parapholas and Penitella," from the same 

 source, p. 335, are given as synonyms 



Parapholas Californica, Conr., =zPholas C., Conr., =Pholas Janelli, Desh. 

 Penitella Conradi, Val., =Pkolas penita, Conr., Pholas concamerata, Desh. 

 Penitella inelanura^ Sby v =.Penitella Wilsoni, Conr. (not Parapholas bisulcata). 



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

 dacea" <fec., by G. W. Tryon, jun., Philadelphia, 1862, the following species 

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

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



Page. 



49. Rocellaria \Gastr oclicena] ovata, Sby. Panama, W. I., and Charleston, Stimp- 

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

 mens." 



74. Pholas ( Cyrtopleura) truncate, Say. Massachusetts j S. Carolina ; Payta, Peru, 

 Ruschenberger ; Chili. 



77. Dactylina (Gitocentrum) Chiloensis, King, 1832, = Ph. laqueata, Sby., 1849. 

 Peru, Chili [Panama, Jeivetf]. Scarcely differs from D. Campechensis.= 

 Ph. oUongata, Say, =Ph. Candeana, D'Orb.; Southern U. S., W.I. 



82. Navea subo'lobosa, 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} ntelanttra, Sby. Lower California, = Pen itella Wilsonii, 

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

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

 Penitella." [ Vide Brit. Assoc. Rep. 1856, p. 265.] 



87. Penitella penita. [Mr. Tryon erroneously quotes (Netastoma) Darwinii, as 



well as Ph. cornea, as synonyms.] 



88. Joiiannetia (Pholadopsis) pectinata, Conr.,= Triomphalia ptdcherrima, Sby. 



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



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

 valve. Hob. Real Llejos." = Dactylina (Gitocentruni) Chiloensis, King [teste 

 Tryon]. 



112. The following Table contains a complete list of 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 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 First Report. 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 officers of 

 the Smithsonian Institution by the Rev. J. Rowell 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 California!! 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. For the full 

 synonymy, the previous pages of the two Reports must be consulted, 



121 



