142 AGAKDHIA. 



states that P. valsabina differs from ligustica by its more 

 strictly cylindric shape, the whorls flatter, the suture less im- 

 pressed, the surface smoother, the umbilicus practically 

 closed ; and above all by the characters of the aperture, which 

 is very narrow with the peristome continuous and free, and 

 oblique in a direction opposite to that of the other species. 

 The deeply placed palatal folds are short, thick, and not 

 parallel to one another as in other species. The upper and 

 lower ones are punctiform. Length 4, diam. iy± mm. 



Spinelli's poor figures are reproduced photographically in 

 my pi. 18, fig. 3. I have not seen the species, and have ac- 

 cepted Pollonera's identification, considering Gredler 's Pupa 

 spinellii as probably synonymous. Gredler identified two 

 specimens taken by Baron A. von Tiesenhausen in Val Lorina, 

 an alpine transverse valley of the Val Ainpolo, as the true 

 P. valsabina, which he considers a variety of biplicata. 



P. spinellii. — Gredler (1885) raised the question whether 

 Spinelli's specimens were found in drift debris of the lake 

 shore; if so, they were possibly derived from the adjacent 

 Tyrol, Judicarien, Val Ampola, etc. In a later communica- 

 tion (1889) he stated that Spinelli, in his old age, sent him 

 two specimens as his P. valsabina; but that he (Gredler) be- 

 lieves that they are really a distinct species, which he pro- 

 poses to name P. spinellii; his notes of 1885 pertaining to 

 this, and not to the true valsabina. The substance of these 

 notes, by which spinellii is solely known to me, here follows. 



The contraction of the aperture [which is so extraordinary 

 that it could almost be called a (diagonal-) vertically placed 

 slit] is due not only to the callus of the outer lip, but this 

 itself apparently depends on the reflected, backwardly rolled 

 peristome, which is pinched in behind ; to which may be added 

 that the contraction is due also to the lightly bent inward 

 columellar margin, which in biplicata and ferrari is bowed 

 outward. In fact, the aperture, which is a long quadrangle 

 in the two species compared, is here so narrow that it can 

 hardly be called fusiform or elliptical (rather bilocular) ; 

 and above, as below, it almost runs out and recurves in a 

 spout, and is placed more oblique to the axis. The second 

 half of the last whorl is flattened on both sides, and set off 

 from the rest of the height by a deep notch on the umbilical 



