32 



AMERICAN JOURNAL 



it is also found in abundance in the vicinity of the ruins, by the 

 border of a little river where there is luxuriant vegetation of 

 grass. On the plains between Igaliko and Tunnundliarlikfjord, 

 (Sept. 1, 1839), Kasiarsuk. (Rev. Jorgensen, 1840.) 



The dimensions are from an unusually large specimen. The 

 beautiful rose color of the spire is one of its most striking fea- 

 tures. It is closely allied to S. arenaria, but much larger. 



I for a long time considered the variety, of which I only 

 possess a few specimens, to be unusual large individuals, but I 

 have since found young specimens corresponding in the breadth 

 of the aperture. 



Succinea Groenlandica is found in Iceland and perhaps, too, in 

 Denmark. Among specimens from Iceland were found some 

 with lateral denticles on the mandible, like those of S. amphibia, 

 but I am unable to see any difference in the shell. 



PULMONATA, HYGROPHILA. 



6. Planorbis arcticus, Beck. Plate 4, fig. 9. 



T. sinistrorsa* flavescente cornea lsevis strigis incrementi ob- 

 scuris ssepe 2 aequidistantibus, utrinque fere asqualiter umbili- 

 cata ; anfr. 3J convexis suturis canaliculars ; superne concavo 

 anfr. ult. obsoletissime angulato ; inferne planiuscula centro im- 

 merso ; apertura oblique hippocrepiformis faucibus lacteis callo 

 parietali crassiusculo candido, augustato. 



Diam. 5. m., diam. transv. apertura 1J m. (Morch.) 



Animal grayish, tentacles long, filiform, pellucid, with an in- 

 ternal black line from the base to the point. The head looks to 

 me shorter and more round than that of the European species. 

 (Moll.) 



Planorbis arcticus, Beck, Index, p. 123, No. 61. 

 " Moll., Index, p. 5. 

 " " Dkr., Mgr. in Kiister. (From Troschel.) 



Planorbis alius, Midd., Reise, p. 404. f 



a i. 



This species looks most like Planorbis parvus, Say, and PI. 

 deflectus, Say and Gould, according to the figures. Of European 

 species it is most like to PL Dazuri, (PL spirorbis, Rossm. f. 63), 

 but has broader and fewer whorls. 



In stagnis alpinis ad Tunnundliarbik, 1829, (J. Vahl.), 



* Morch, Journal de Conch. Say, Sowerby, 1824, considered the 

 shell sinistral, 

 t PI. Sibericus, Dkr., Annals, 1848, 2, p. 454. 



