Vlir.— APPENDIX. 



Receut explorations in extreme northern regions have added several 

 names to our catalogue of laud shells which I refer to here. I am not 

 able to decide on the accuracy of the identification of the species. 



Limax hyperboreus, Westerlvst), KM. (See below.) 

 Pupa arctica, Wall. 



columella, Benz. 

 Succinta chrysis, Westerlund. (Also p. 198, pi. iii, fig. 10.) Alaska, Greenland. 

 (See below.) 

 turgida, West. 



a?! nexa, Westerlund. (Also p. 198, pi. iii, tig. 11.) Port Clarence, Alaska. 

 Vallonia asiaiica, Nev., p. 164. 

 Pupa edevtula, Drp. (?) 

 signata, MSS. 



The above are from "Vega Expeditionens," Stockholm, 1885. I am 

 enabled to give a figure of a specimen of Suceinea chrysis, col- ^^^' ^^^' 

 lected by Mr. Dall, at St. Michael's, Alaska. It is the form 

 generally considered as a variety of S. lineata. (See also Nach. 

 der Deutsch. Mai. ges., 1883.) 



° ' ' S. chrysis. 



I am indebted to Mr. W. H. Dall for authentic specimens of Xtwaj? hyper- 

 boreus, from which I extracted the jaw and lingual 

 membrane here described. 



Jaw arched, smooth, with blunt median projec- 

 tion. Lingual membrane with about 42-1-42 teeth ; 



Fin. 516.— Lingual dentition 



centrals tricuspid; laterals bicuspid, twelve m of l. hyperboreus. 

 number on each side ; marginals about thirty in number on each side, 

 aculeate, simple, without bifurcation or side spur. 



Fig. 516 shows a central tooth with its adjacent lateral and three 

 extreme marginals. 



Vertigo BoUesiana var, Arthuri. (See VON Martens, Gesell. nat. Freunde zu Berlin, 



21 Nov., 1882, p. 140.) Dakota. 

 Pupa muscorum var. bigranata, Rossm., ibid., p. 141. Fort Berthold. 

 Pupa muscoruvi var. Lundatromi, Westerl., 20 March, 1883, p. 36. Alaska. 



(473) 



