1893.] NATURAL SCIENCES OF PHILADELPHIA. 259 



obtain authentic specimens of adela, some doubt in regard to this 

 question will yet remain. 



4. V. pollinensis Paulucci. 



ILL pollinensis in Westerlund, Fauna, I Suppl., p. 120. 



Shell with a rather narrow, funnel-shaped umbilicus (the same at 

 the aperture, little and gradually widening), convex, with obtuse, 

 prominent apex, light horn colored, exceedingly finely striate, 

 adorned with more distant, acute, lamellifbrm, regular fine ribs ; 

 whorls 4?, regularly increasing, convex, with impressed suture, the 

 last gradually increasing and not at all expanded at the aperture, 

 rather constricted, scarcely wider than the penultimate, slightly, and 

 gradually descending above ; aperture little oblique, crescentic-cir- 

 cular, descending [?], margin straight, simple ; only the columellar 

 margin somewhat everted high up. Size 2 5 by \\ m. (Italy, Monte 

 Pollina in Prov. Potenza : Paul, ex.) Not figured. 



Translated from Westerlund, I.e. 



I have seen no specimens. To judge from the description, it 

 seems to be a somewhat intermediate form between the above 

 species and the costate groups. 



5. V. costata Muller, PI. VIII, figs. C, N. Man. Conch., PI. 32, figs. 18-22, 27, PI. 33, 

 fig. 54. 



Helix costata Muller, Verm. Hist., II, 1774, p. 31. 

 Helix costata Ro^sm. Icon., 439. 

 Helix costata Dupuy, Hist. 1848, p. 162, T. 7, fig. 4. 

 Helix costata Westerlund Fauna, I, p. 14 — a. o. 

 Helix pulchella var. costata of most authors. 

 Vallonia rosalia Risso, 1826 (ex. West. /. c). 



Shell with a moderate umbilicus more widening for the last i-$ 

 whorl, depressed convex above (or nearly flat), grayish to light or 

 reddish horn colored, with rather regularly set membranous ribs and 

 irregular microscopic stria? between them ; nucleus with fine revolv- 

 ing lines; whorls Si, slightly flattened above and below the periph- 

 ery, at the latter somewhat angular, with a deep suture, rather 

 rapidly increasing ; the last expanding near the aperture and 

 shortly descending, more so at the suture than on the back ; aper- 

 ture rather inclined and oblique, almost circular, a little flattened 

 above and angular at the base, with ends of margin much approxi- 

 mate, slightly protracted and auricled, connected by a thin callus; 

 peristome strongly and abruptly everted, except near the suture, 

 with a strong, white lip evanescent at either end. 



Diam. maj. 2*5, min. 2*1, alt. l'l mm. 



