132 THE NAUTILUS. 



staiting points for numerous subsequently developed genera, are 

 usually notable for their tendency to vary and interchange charac- 

 ters. In the present case, perhaps, the very general habit of com- 

 mensalism or parasitism, has produced degeneration, accompanied by 

 a revival of atavistic primary characters." 



Other introductory remarks are followed by a list of species from 

 the east and west coasts of North America, with synonymy and dis- 

 tribution. From the east coast there are recorded 13 genera, 34 

 species and one variety ; from the west coast 12 genera, 33 species 

 are listed. 



A list of the tertiary species of the United States is also given, 

 containing 73 species, divided among 13 genera, followed by "de- 

 scriptions of new species and remarks on others imperfectly known." 

 1 8 new recent species are described, all of the new species are in- 

 cluded in preceding lists. On plate 87 is shown a crab (Gebia pn- 

 qctensis, Dana), with Eryeiiw rugifera, Carp., attached by its bys- 

 sus to the underside of the abdomen of the crab. C. W. J. 



The Mollusk Fauna of the Pribilof Islands. — By Wm. 

 H. Dall. (Extracted from The Seals and Fur-Seal Islands of the 

 North Pacific Ocean, Pt. Ill, pp. 539-546, 1899.) 



A very interesting paper on the geographical distribution of species 

 and the physical characteristics of the region. The faunal summary 

 gives a total of <SG forms. Only three land shells are known from the 

 group : Succinea chrysis, Vitrina exilis and Pupa decora var.? A 

 fauual summary of the Commander Islands given for comparison, 

 shows a total of 74 species from those islands, including six land and 

 three fresh-water forms : Limax hyperboreus, V. exilis, H. radiatula, 

 Conulusfulvus, Patula ruderata var. pauper, P. decora, Limn tea ovata, 

 L. humilis and Pisidium eequilaterale. Fossil mollusks were found 

 only on St. Paul Island. 



Description ok a New Genus, Austrosarepta, and Notes 

 on other Mollusca luoM New South Wales. By Charles 

 Hedley. (Proc. Linn. Soc. N. S. W., pt. 3, pp. 429-434, Dec. 1899.) 

 Following Dr. Dall's classification, Mr. Hedley places this interesting 

 genus in the subfamily Sareptince; the type is a new species A. picla. 

 A new species, Teinostoma starkeyee, is described and figured. Sulen 

 shanii Gray, Neritula lueida, Cassis nana T. Woods, fiantltarus 

 waterhousice Braz., are also figured. — C. W. J. 



