THK NAUTILI'S. 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. 

 pfcifferi Deshayes in F£r. Lima9ons, 1822." I have been unable to 

 trace any V- pfeifferi'm 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. 



Oreoheh'x 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. 



Lymncza petersi Dall. Koyukuk River, north of the Yukon, in 

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

 long. 



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

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



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

 from Nushagak, Bristol Bay, Alaska. 



Lymnsea anticostiana Dall. Pleistocene marl of Marl Lake, 

 Anticosti Island. 



Planorbis campanulatus var. rudentis Dall. Wider and flatter 

 than the type. Knee Lake, Keewatin. 



P. exactions 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.?) nylanderi Dall. Aroostook Co., Maine. 



Valvata lewisi var. helicoidea Dall, With typical lew i si 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 Sintcs boundary. 

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

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

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



H. A. P. 



