ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 211 



Oregon District. 



Alasmodonta falcata. 

 Helix Vancouver ensis. 

 Helix loricata. 

 Helix germana. 

 Planorbis vermicularis. 

 Planorbis opercularis. 

 Lacuna carinata. 

 Natica Lewisii. 

 Trichotropis cancellata. 

 Fusus fidicula. 

 Lottia pintadina. 



To which we may add (from California),- 



Solecurtus lucidus. 



Atlantic Coast. 

 A. arcuata. 

 H. concava. 

 H< inflect a. 

 H. fraterna. 

 PI. deflectus. 

 PL exacutus. 

 L. vincta. 

 N. heros. 

 Tr. borealis. 

 F. turricula. 

 L. testudinalis, &c. 



<S. radiatus. 



The following are quoted as parallel types between the Gulf of California 

 and the Caribbean Sea : — 



Gulf of California. 

 Lutraria undulata. 

 Mactra nasuta. 



Lutraria ventricosa [Mactra exoleta\. 

 Cytherea biradiata. 

 Natica Chemnitzii, Pfr. 



Caribbean Sea. 

 L. canaliculata. 

 M. Brasiliana. 

 L. carinata. 



C Chione. \ Mediterranean . 

 N. maroccana. J 



The following species have also been examined and determined by Dr. 

 Gould, from the same collection : — 



Helix tudiculata, Binney, Oregon. 



Acmcea cribraria, G., Columbia River, 

 San Francisco, De Fuca. 



Modiola elongata, G., Puget Sound. 



Solen maximus, Mouth of Columbia R. 



Tellina nasuta, Conr., Mouth of Colum- 

 bia River. 



Tellina secta, Conr., De Fuca. 



Tellina Californica, Conr., De Fuca. 



Tellina Bodegensis, Hinds, Classet. 



Anodonta Nuttalliana, Lea, Wallawalla, 

 San Francisco. 



Buccinum corrugatum, Rve., Puget Sound. 



Purpura septentrionalis, Rve., Puget Sd. 



Melania plicata, Lea, Oregon. 



Melania Wahlamat ensis, Lea, Sacra- 

 mento River. 



(Cryptomya) Sphcenia Calif brm'ca, Conr., 

 Sacramento River. 



Melania occata, Hds., Sacramento River. 



Triton tigrinum, Brod., Puget Sound. 



Modiola discrepans, Mont., Puget S. [! !] 



Modiola ? vulgaris, Puget Sound. 



Pecten Fabricii, Phil., Puget Sound. 



Fusus cancellinus, Phil., De Fuca. 



Pholas (concamerata, Desh. =) penita, 

 Conr., San Francisco. 



Paludina seminalis, Hds., Sacramento. 



In the MS. list of the shells collected in the Oregon and Californian 

 district during the U.S. Exploring Expedition, sent by Dr. Gould, and in- 

 cluding the above, there appear 70 species from Oregon, a district before so 

 little known, that only 23 of them have been identified with previous names, 

 the rest having been described by Dr. Gould. 



Through the great kindness of Dr. Gould, who showed his desire to make 

 the materials for this Report as complete as possible, by copying out all the 

 valuable information which was in his possession, we are enabled to .present 

 the materials from which the foregoing lists were drawn up, in the shape in 

 which they first made their appearance. They are the only documents 

 approaching the authority of "dredging papers," which have been made 

 public, in the whole history of the coast, from Behring's Straits to Panama. 

 They are the memoranda made by Dr. Charles Pickering of the U.S. Expl. 

 Exp. ; the specific names having been for the most part added by Dr. Gould 

 on identification. 



p2 



