BIBLIOGRAPHY OF 1876. 275 



Dall (W. H.)— On the Marine Faunal Regions of the 

 North Pacific ; an introductory note to the report 

 on Alaskan Hydroids by iVlr. Clark.— Proc. Ac. Nat. 



Sci. Philad., 1876, pp. 205 to 208; also published at Wash- 

 ington, Dec. 1876, as part of Vol. I. of the 'Scientific Results 

 of the Exploration of Alaska.' 



Mr. Dall finds that Mr. Clark's researches on the hydroids 

 confirm his own views published in 1873 as to the faunal regions 

 of the Alaskan coast and re-states those views. He considers 

 that the coast of Alaska and Northwest America from Monterey, 

 California, north and west, may be divided into three faunae, viz. : — 



I. The Oregonian fauna, extending from Monterey to the 

 Shumagin Islands; II. the Aleutian fauna, from those islands 

 westward throughout the Aleutian chain and northward to the 

 winter-line of floating ice in Bering Sea; III. the Arctic fauna, 

 a well-recognized one, limited southwards by the winter-line of 

 floating ice. Mr. Dall in the course of further remarks reiterates 

 his view of 1868 that temperature, and that alone, is the great 

 factor in determining the limits of marine faunae, all other factors 

 being merely subsidiary. 



Dall (W. H.) — On the Extrusion of the Seminal Products 

 in Limpets, with some remarks on the Phyllogeny 

 of the Docoglossa. — Proc. Ac. Nat. Sci. Phil., 1876, pp. 

 239 to 247; also published Dec. 1876, by the Smithsonian 

 Institution as portion of Vol. I. of the 'Scientific Results of 

 the Exploration of Alaska.' 



Includes some additional notes on the genera of limpets and 

 concludes with a genealogical tree of the Docoglossa. 



Duprey (E.) — Shells of the Littoral Zone, and Fresh- 

 water and Land Shells in Jersey, — Ann. and Mag. Nat. 

 Hist., Oct. 1876, 4th series, xviii. 



