:hz naviilvs. 



The specimens were dredged in about 50 fathoms. The um- 

 bones in A. villctti are 6.0 mm. behind the anterior end of the 

 shell; in A. compacta about 5.5 mm., the result being that the 

 latter has a more triangular outline. The type of -4. icilletti is 

 number 216364 of the catalogue of mollusks of the U. S. Na- 

 tional Museum. 



sons :x soeial lasi ax: "i$z~i7i3: skills 



BY WM. K. DALL. 



The National Museum has received a small lot of fresh-water 

 -'•-•ells iron: It. T. E. Winecc-fr. stationed at Fort Yukon. 

 Alaska, nearly on the Arctic circle, which are of more than 

 ordinary interest They were collected from a small pond near 

 the fort and the large Lymnaea abounded in such numbers as 

 to give a pinkish tint to the water in which they were, accord- 

 ing to the collector. The species are: 



Lymnaea appressa Say, rather small for the species, and of a 

 brownish tint not unlike the usual color of L. palustris. 



Lymnaea pahutris MuMler. Ordinary type and size. 



Lymnaea anarginata mighelni Binney. Not known so far 

 it-rrthwest. 



Planorbis trivolris Say, medium size, abundant. 



Hanorbis crista Linne, one specimen. Nearest known locality 

 is Carberry, Manitoba. 



Pisidium resiculare Sterki, one specimen. 



During a cruise in Bering Sea last summer, Mr. G. Dallas 

 Hanna touched at St, Mathew Island in the northern part of 

 Bering Sea. From small ponds in the island he obtained the 

 following :ios : 



Aplexa hypnorum Linne. 

 Pianorbis parvus Say. 

 Valcata mergeUa Westerlund. 

 Pisidium scutellatum ? Sterki. 

 Succinea chrysis Westerlund. 



