104 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



ON SOME FEESH-WATER SHELLS FROM THE ISLAND OF KOLGUEV. 



By Edgak a. Smith, F.Z.S., etc. 



Read Uth March, 1896. 



" As Kolguev Island lies but fifty miles off the coast of Arctic Europe 

 it may fairly be regarded as European. A glance at the map will 

 show that it is the only island in that part of the Arctic Ocean known 

 as Barents Sea." 



Mr. A. Trevor-Battye, from whose book, "Tee-bound on Kolguev," 

 I have quoted the above paragraph, did not collect any terrestrial 

 or fresh-water molluscs during liis expedition in 1894, his attention 

 being more devoted to botany, birds, and mammals. Colonel H. W. 

 Eeilden, the well-known Arctic naturalist, was, however, during his 

 visit in 1895, successful in finding the following three species of 

 fresh-water shells, the first recorded from the island. Although no 

 land-shells have as yet been discovered, it is very probable that some 

 species of Zonitida^ and rupida3 may occur, such forms apparently 

 being capable of enduring an Arctic climate. 



Colonel Eeilden also obtained a few marine forms. They are not, 

 however, of any special interest, belonging to well-known boreal 

 forms of Bmcinum, Littorma, Astarie, Cardium, and Mi/tilus. 



The three fresh- water species are — 



1. LlMN^A PALTJSTKTS, Miillcr. 



Var. terehra. Westerlund, Eauna Paliiarct. Begion, Theil 2, p. 46. 



Hah. — Kriva Biver (Eeilden). 



In these specimens the spire is often much produced, the whorls are 

 very convex, and the surface, when cleaned, has a silky appearance. 

 The lines of growth are fine and oblique, and interrupted by 

 somewhat distant, impressed spiral lines, producing a more or less 

 reticulated appearance. All the specimens have the apex eroded ; and 

 the largest, consisting of four remaining whorls, is 22 mm. in length. 



2. LiMN^A OVATA, Drapamaud. i 



" Var. nova. — Pra?cipue notabilis, spira elongata, I 

 crassa, contorta, sutura impressa, pone aperturam ob- 

 liqua, anfractu antepenultimo tumido-convexo, ultimo i 

 ventroso, infra levissime attenuato, subrotundato." i 

 (Wcstcrlund in litt.) ! 



Hah.- — Valley of the Gobista Biver (Eeilden). j 



Mr. C. A. Westerlund, wlio kindly gave me hisi 



Limn/va ovafa . . , . ' n i / • i j.-i> -i 



var Kuhmcvensis. opimon upon these species, was unable to identity tliese 



specimens with any known form of this species ; I ! 



therefore suggest the name Kolguevensis for this variety. It is veryi 



unlike the typical form, the greater length of the spire and the) 



tumidity of the penultimate whorl being very remarkable. 



3. Planorbis borealis (Loven), "Westerlund. 



P. horoalis, Loven, Westerlund, Mai. Bliit. 1874, vol. xxii, p. 112,' 



pi. ii, figs. 23-5 ; Fauna Paliiarct., Theil 2, p. 80. 



Ilah. — Kriva Biver (Eeilden). 



