97 



A CLASSIFIED LIST OF THE HELICOID LAND 

 SHELLS OF ASIA. 



fPART III.*) 



By G. K. GUDE, F.Z.S. 



ii. ASIATIC RUSSIA. 



A. WESTERN TURKISTAN. 



The Helicoids of Russian Turkistan exhibit strong affinity with those 

 of Eastern Turkistan, notably in the presence of the genera Gathaira 

 and Macrochlcuni/s. The occurrence, on the other hand, of two species 

 of Zo/iites, one of liefi/ieUa, and seven species of the Belogona 

 Siphonadenia proves relationship with the Palaearctic Fauna. 



The earliest record of Helicoids is by Prof von Martens, who 

 worked out the collections of Fedtschenko and Semenow. Others 

 were described by Dr. AVesterlund from material collected by Dr. S. 

 Korschinsky, Adrianow, Dr. A. Nikolsky, A. Kuschakewitsch, L. 

 Bartschtschewsky, Dr. A. Regel, A. Kasnakow, and K. E. Stenroos. 

 The shells collected by the latter went to the Museum of Helsinefors, 

 while all the others described by Dr. Westerlund are in the Imperial 

 Museum of St. Petersburg. 



Maerochlamys eoeligena, n.sp. 



(Figs. 1-3.) 



Shell narrowly perforate, lenticular, depressed, fragile, greenish 

 corneous, translucent, polished, finely striated, shortly and slightly 



costulate near the sutural margin. Spire obtuse, suture somewhat 

 shallow, margined. Whorls 4^, compressed and a little flattened 

 above and below, slightly sloping towards the suture, increasing slowly 

 at first ; last whorl more than twice the size of the penultimate, 

 widened towards the mouth, not descending in front, rounded at the 

 periphery, impressed round the umbilicus. Aperture oblique, much 



* See Ante p. 51. 



