THE NAUTILUS. 95 



Circinoria vancouverensis var. chocolata. " A variety of a dark 

 chocolate-brown color, otherwise like the ordinary form, was found 

 rather commonly at Sitka," 



Vitrina alaskana Dall, new name for V, pfeifferi Newc., " not V- 

 pfeifferi Deshayes in Fer. Lima9ons, 1822." I have been unable to 

 trace any V- pfeifferi in Ferussac's work which is cited without page 

 reference as above. Vitrina is not recognized as a genus in that 

 work, which so far as I recollect was published before Deshayes had 

 begun publishing on land shells. It would be well to await fuller 

 data proving preoccupation before rejecting Newcomb's well-known 

 name for this species. 



Oreohelix strigosa var. stantoni. Dwarfed, measuring in maximum 

 diam. 10, min. 8.5, height 8 mm., with about 5 whorls, umbilicus 

 1 mm. Assiniboia, 33 miles s.-e. of Medicine Hat., near top of 

 Cypress Hills, alt, 4700 ft, 



Lymn&a petersi Dall. Koyukuk River, north of the Yukon, in 

 Alaska. A delicate species of the typical group of Lymnsea, 16 mm. 

 long. 



Lymncea (binneyi var.?) preblei Dall. A large and peculiar form 

 from Manitoba and Keewatin, 37-38 mm. long. 



Lymnaa perpolita Dall. A small, dark, smooth and polished form 

 from Nushagak, Bristol Bay, Alaska. 



Lymnaea anticostiana Dall. Pleistocene marl of Marl Lake, 

 Anticosti Island. 



Planorbis campanulatus var. rudentis Dall. Wider and flatter 

 than the type. Knee Lake, Keewatin. 



P. exacuous var. meyas Dall. Whitish, and larger than the 

 typical form. Manitoba. 



Segmentina (Planorbula) christyi Dall. Manitoba. Larger, flatter 

 and more sharply sculptured than S. armigera Say. 



Valvata (sincera var.?) nylanderiDall. Aroostook Co., Maine. 



Valvata leivisi var. helicoidea Dall. With typical lewisi especially 

 northwestward. More depressed, with the last half whorl more 

 peripherally diverted. 



The work will take a place hitherto unfilled in America, that of a 

 standard fauna of the region north of the United States boundary. 

 It is a pleasure to add that the mechanical execution, paper, typog- 

 raphy and press-work, are worthy of the subject-matter, and are a 

 credit to the publishers, Messrs. Doubleday, Page & Co. 



H. A. P. 



