ON 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., =Pholas C., Conr., =Pholas Janelli, Desh. 
Penitella Conradi, Val., =Pholas penita, Conr., =Pholas concamerata, Desh. 
Penitella melanura, Sby., =Penitella Wilsoni, Cony. (not Parapholas bisulcata). 
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, Rocellaria { Gastrochena] ovata, Sby. Panama, W. I., and Charleston, Stimp- 
son. “Not the slightest difference between the Pacific and Atlantic speci- 
mens.” 
74. Pholas (Cyrtopleura) truncata, Say. Massachusetts ; S. Carolina; Payta, Peru, 
Ruschenberger ; Chili. 
77. Dactylina (Gitocentrum) Chiloénsis, King, 1832,=Ph. laqueata, Sby., 1849. 
Peru, Chili [Panama, Jewett]. Scarcely differs from D. Campechensis,= 
Ph. oblongata, Say, =Ph. Candeana, D’Orb.; Southern U. 8., W. I. 
82. Navea subglobosa, Gray, Ann. N. H. 1851, vol. vil. p. 385. California. [In 
a hole ina shell. Cabinet Gray.” Neither shell nor authority cnteast 
85. Pholadidea (Hatasia) melanura, Shy. Lower California,= Penitella Wilsonit, 
Conr., J. A. N. Se. Ph., fig. 4 (non 5). “This error in figuring led Dr. 
Gray to misunderstand both the species and Conrad’s idea of the genus 
Penitella.” [| Vide Brit. Assoc. Rep. 1856, p. 265. ] 
87. Penitella penita. [{Mr. Tryon erroneously quotes (Netastoma) Darwinit, as 
well as Ph. cornea, as synonyms. | 
88. Jouannetia (Pholadopsis) pectinata, Conr.,= Triomphalia pulcherrima, Sby. 
“ California” [no authority], W. Columbia. 
127. “ Pholas retifer, Morch, Mal. Blatt. vii. 177, Dec. 1860. One broken right 
valve. Hab. Real Llejos.” = Dactylina ( Gitocentrum) Chiloénsis, King [ teste 
Tryon]. 
112. The following Table contains a complete list of all the Molluses which 
have been identified, from Vancouver Island to 8. 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 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 large 
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. 
