Vol. IX] SMITH— CLIMATIC RELATIONS 133 



Panomya ampla Dall, Panopea generosa Gld., Pecten caurinus 

 Gld., Pecten hericeus Gould, Phacoides anniilatus Rv., Saxi- 

 domus giganteus Desh., Siliqua nuttalli Con., Thracia trapezoi- 

 dea Con., Thyasira bisecta Con., Venericardia ventricosa 

 Gld., Amphissa corrngata Rv., Boreotrophon gracilis Perry, 

 Boreotrophon stuarti Smith, Chrysodomiis phoeniceus Dall, 

 Chrysodonius tabulatus Baird, Haliotis gigantea Chem., Natica 

 claiisa B. & S., Purpura foliata Martyn, Tritonofusus jordani 

 Dall, Trichotropis cancellata Hds., Turris perversa Gabb. 



The Puget Sound fauna contains a considerable number of 

 circumboreal species, also several inhabitants of the Japanese 

 coast that are not circumboreal. The influx of circumpolar 

 species is probably going on now, but that from Japan cer- 

 tainly is not. All the species on the northwest coast that are 

 common to Japan date back to Pliocene time, when the con- 

 figuration of the coast-line, and the climate permitted free 

 intermigration between the two regions. 



III. Middle California (Cape Mendocino to Point Concep- 

 tion, lat. 40°-34° 30' N., min temp. 54° R). Cardium corbis 

 Martyn, Pandora punctata Carp., Paphia staminea Con., Paphia 

 tenerrima Carp., Macoma bodegensis Hds., Modiolus flabella- 

 tus Gld., Schizothoenis nuttalli Con., Tivela crassotelloides 

 Con., Yoldia cooperi Gabb, Bathytoma carpenteriana Gabb, 

 Calliostoma canalicidatum Martyn, Cancellaria crazvfordiana 

 Dall, Chlorostoma montereyi Kien., Gyrinemn calif ornicum 

 Hds., Lucapina crenulata Sby., Nassa fossata Gld., Nassa per- 

 pinguis Gld., Polinices lezvisii Gld., Haliotis rufescens Swain, 

 Dendraster excentricus Esch., Strongylocentrotus purpuratus 

 Stimp. 



There are few characteristic species confined to this province. 

 The fauna is chiefly composed of northern species ranging 

 southward, and southern species ranging northward. 



IV. Southern California (Point Conception, California, to 

 Cerros Island, Lower California, lat. 34° 30' to 28° N., min. 

 temp. 62° F.). Amiantis callosa Con., Area multicostata Sby., 

 Atrina oldroydi Dall, Cardium elatum Sby., Cardium quadri- 

 genarium Sby., Chione succincta Val., Chione fluctifraga Sby., 

 Metis alta Con,, Pecten cequisulcatus Carp., Pecten diegensis 

 Dall, Pecten hastatus Shy., Phacoides richthofeni Gabb, Spisula 



