THE NAUTILUS. 17 



From the same source and locality (Karghalik), I also obtained 

 the form I have described as Bid. kmckalceivitzi, var. Funki. 



II. Pseudiberus uniformis n. sp.=Helix plectotropsis (in parte) von Mart, et al=//. 

 plectotropsis var. uniformis, Anc. olim. 



This is the so-called variety that I had formerly looked upon (Le 

 Naturaliste, 1887, p. 167) as a variety of Martens' Helix pledotropis. 

 At that time I had a single specimen of the latter, but I now have 

 more of the typical form (from Lake Tssyk-Kul and Karghalik) for 

 comparison, so that I consider uniformis a very distinct, although 

 allied form. Altogether it comes from a different district (Arassau 

 Culak) and appears to be very constant. The characteristic features 

 having already been described by myself in the paper I alluded to, 

 I shall simply say that uniformis is a paler and more depressed shell 

 than plectotropis, with a wider umbilicus and much more acute keel. 



III. Pseudiberus anisopleurus n. sp. 



Shell rather thin, of a greenish-horn color, coarsely sculptured, 

 somewhat shining, closely related in form, size and shell characters 

 to Nevill's mataianensis, found in the Dras Valley, region of Ladak, 

 but of different and uniform color. Spire convex, not much elev- 

 ated, obtuse. Whorls 5, convex, furnished with broad, distant and 

 irregular ribs, closer and more regular on the under side, but never 

 obsolete. Suture furnished with an appressed keel, canaliculate 

 above. Body whorl briefly, but not abruptly falling in front, con- 

 vex above the inserted keel, more so below, the keel somewhat irreg- 

 ular, margined on both sides, especially above where the impressed 

 line is very conspicuous. Umbilicus medium-sized. Aperture 

 oblique, transversely oval, livid within, scarcely angular internally, 

 barely lunate. Peristome white, moderately thickened, expanded, 

 reflected below, chiefly towards the umbilicus. Margins not remote, 

 connected by a thin shining callosity. 



Great, diarn. 14?, less. 12-1 ; height 8, of aperture 6>!> mill. 



Locality unknown, but judging from its very well marked affini- 

 ties, this fine new species for which I am indebted to my friend Dr. 

 A. Vayssiere, is undoubtedly from Central Asia. At a glance, I 

 had mistaken it for mataianensis, which is known to me from the 

 description and figure only, but am now satisfied it is very distinct. 

 The color, sculpture and characters of the suture are not the same. 

 In the latter respect the present Pseudiberus is more like the true 

 /'. plectotropis, but the color is equally different, the size smaller 

 and the ribs larger and much less numerous and regular. 



