1893.] NATURAL SCIENCES OF PHILADELPHIA. 275 



14. V. mionecton Boettger. 



ILL adela West. var. mionecton Bttg , Zool. Jahrb. IV, 1889, T. 27, f. 11. 

 Hel. tenuilabris var. mionecton (Bttg.,), West. Fauna, I. Sup], p. 120. 

 Vallonia mionecton Bttg , cit. in Nachr. Bl. D. Mai. Ges. 1892, p. 125 (O. 

 Rosen.) 



"Smaller, more depressed, almost regularly, very finely rib- 

 striate ; whorls only 3, the last, as also the upper margin of the 

 peristome, somewhat angular above; size 2f-2J : \\ mm. (Trans- 

 Caucasia, on the summit of the Agh-dagh in the Kopet-dagh, at 9- 

 10,000 feet). Dr. Boettger ranges this form under my adela, but 

 the excellent figures show the last whorl much widened in front, 

 deep descending above, margins much approximate, almost con- 

 nected, etc." From Westerlund, Fauna, /. c. translated. 



In Baron O. Rosen's article, evidently influenced by Dr. O. 

 Boettger, V. mionecton is treated as a species, and published. 



V. mionecton var. schamhalensis Rosen. 



Differs from the type in the shell being smooth \_polita~\ not rib- 

 striate. Schamhala, Prov. Chorassan, Persia. 



I have seen no specimens of either the type or variety. 



15. V. ladacensis Nevill. 



Scient. Res. of the Sec. Yarkand Miss., Moll., p. 4 — Mts. Centralasiat. Moll., 

 1882, p. 3, T. 3, f. 3.— Westerlund, Fauna, I, p. 15. 



" Shell widely umbilicated, depressed, with little elevated spire, 

 densely and finely ribbed (ribs sometimes almost obsolete), grayish 

 white ; whorls 3?, somewhat convex, the last rounded, descending 

 in front ; aperture very oblique, transversely pear-shaped, peristome 

 everted (" reflexed "), rather thin, with margins much approximate, 

 inferior margin more curved. Size 3i : 1$ m. (Central Asia, near 

 Iskardo in Tibet)." Descr. from Westerlund, I. c. translated. 



V. ladacensis var. (?) asiatica Nevill. 



Hel. costata var. asiatica Nevill, /. c. 



Vail, ladacoisis var. asiatica Nevill, Reinhard, iiber die von den Herren Gebr. 

 Krause auf ihrer Reise gesammelten Pupa-, Hyalina-und Vallonia- Arten; Sitzungs- 

 ber. der Ges. Naturf. Freunde, Berlin, 1883, p. 42. 



Reinhard says (I. c.) that on Pyramid Island, Alaska, a Vallonia 

 has been collected by MM. Krause which is identical with asiatica, 

 except for its somewhat smaller size. He states that the latter 

 comes nearer ladacensis than costata, under which it has been 

 ranged by the author. Mr. Pilsbry believes that the Alaska form 

 is not the same as the Asiatic. 



