52 



OUDE : LIST OF HELICOID LAND SHELLS. 



maps to which I have access show these places on the Chinese side of 

 the frontier, I have accepted Mr. Ancey's view and have included 

 these shells in the Tibetan list. 



The species described by Dr. von M Ollendorff from the Koko-nor 

 district are also included here, for, although Dr. von Mollendorff is In- 

 clined to consider this district outside Tibet, Prejevalski, Bonvalot, 

 ^^'^ellby, and Hedin all show it on their maps within the boundaries of 

 north Tibet. 



On glancing at the known 'Tibetan Helicoids, one feature is 

 striking, viz., the absence of Zonifidae ; and we have also a prepon- 

 derance of the typical genus Gathaira. That the Zonitidaf will be found 

 on further exploration, however, may be inferred from the fact that they 

 have been recorded from all the surrounding countries. 



As a case of apparent erratic distribution may be cited Cafhaira 

 stolirzkana, Nevill, recorded originally from eastern Turkistan, and 

 which has been found in the extreme east of 'J'ibet, near Yerkalo. 



Family Helicidae. 

 Group Belogona, v. Iher. 



BeLOGONA EUADENIA, Pils. 



Genus Eulota, Hartm. 

 Section Eulotella, s.s. 



physeta, Anc. 



pandynama, Mab. 



= poirieri, Bourg. 



desgodinsi, Anc. Yerkalo. 

 Genus Cathaica, Mdff. 

 Sub-genus Eucathaica, Andreae. 



giraudeliana, Hde. Yerkalo. 

 Sub-genus Xerocathaica, Andr. 



holdereri, Andr. N.E. Tibet. 



stoliczkana, Nev. \'erkulo. 



cucunorica, Mdff Kokcj-nor. 



siningfuensis, Hilb. Nan-shan 

 Range. 

 v. brunnescens, Mdff. 



nanschanensis, Mdff. Nan- 



shan Range. 



kreitneri, Hilb. N.E. Tibet. 



pulveratricula, Mts. Nan-shan 



Range, 

 ohlmeri, Andr. Koko-nor. 

 fedtschenkopsis, Anc. 



Yerkalo. 

 reneana, Anc. Yerkalo. 

 Sub-genus Campylocathaica, 



Andreae. 

 cunlunensis, Mdff. Di-chu. 



N. Tibet, 

 przewalskii var. minor, Andr. 



Nan- shan Range. 

 Genus Plectotropis, Mts. 

 hilberi, Anc. Ta-tsien-lou. 



BeLO(;OXA SlPIlOXADKNIA, Pils. 

 Genus Vallonia, Risso. 



asiatica, Nev. South Koko-nor 



Range, 

 ladacensis, Nev. Narka, 

 AV. Tibet. 



v. tibetana, Mdff. Burhan 

 Bota, south of Tsaidam. 



C. E ASTE R N ' I ' U R K I SI' AN . 



The earliest records from this region are by von Martens, based on the 

 collection of Ecdtschenko, and by G. Nevill, from specimens obtained 



