236 COLUMELLA. 



Proe. Zool. Soc. LoncL, 1854, p. 206. — Paiva, Mon. Moll. 

 Mader., 1867, p. 117. — Pfr., Monogr., iii, p. 531 ; iv, 663.— 

 Wollaston, Testae. Atlantica, p. 208. 



The rather broad, inflated, rounded-ovate, or somewhat glo- 

 bose, LimnaBus- (or, rather, Paludina-) like form of this re- 

 markable Pupa, in conjunction with its few and ventricose 

 volutions (which are densely but very finely striated), its 

 pale, yellowish-cinereous hue (often becoming whiter towards 

 the more or less decorticated apex), its comparatively thin, 

 fragile substance, and its perfectly edentate aperture and un- 

 thickened lip, will at once separate it from its allies (Wol- 

 laston) . 



The first iy 2 whorls are smooth, the rest very finely, closely 

 striate, the stria? rather sharp or in places partly effaced. 

 This species differs so much from the other Columellas that it 

 is rather doubtful whether it belongs to that genus. Figured 

 from a specimen collected by Wollaston. 



2. European and Asiatic species. 

 3. Columella edentula (Drap.). PI. 30, figs. 9, 10, 11. 



The shell is perforate, oblong-ovate, tapering above, cylin- 

 dric in the lower two whorls, or tapering slightly from the 

 last whorl, the summit rounded ; thin ; cinnamon or a little 

 darker colored, sometimes having some whitish streaks ; glossy, 

 nearly smooth, but under the microscope showing some irreg- 

 ular wrinkles of growth. The whorls are convex, the last two 

 rather strongly so. Aperture oblique, rounded, truncate by 

 the preceding whorl, toothless. Peristome with thin, sharp, 

 unexpanded outer margin, the eolumellar margin reflected; 

 margins remote. 



Length 2.5, diam. 1.3 mm.; 6 whorls. Calvados. 



Length 2.2, diam. 1.3 mm.; 5% whorls. Calvados. 



Length 2.3, diam. 1.3 mm.; 6 whorls. Cruce, Moldavia. 



Length 2.15, diam. 1.25 mm. ; 6 whorls. Dalaroe, Sweden. 



Europe generally; the Caucasus region and Turkestan; 

 main island of Japan. America, from Alaska to Oregon, east 

 in the northern states to the Middle States, New England, 

 and Labrador. 



