276 HAAS: ABIDA AND CHONDRINA. 



near Artias in the Valle d'Aran, thus in the upper Garonne 

 valley, serves to illustrate this form in pi. 23, figs. 13, 14. 



Contrary to the view expressed by Pilsbry (Vol. XXIV, p. 

 179), A. bigerrensis (ringens) is known to me from, various 

 valleys on the southern side of the Pyrenees. I never found 

 it outside of the mountains, but there are specimens before 

 me from the Basque country (Ordufia and San Sebastian). 



6. Abida pyren^earia (Mich.). PI. 24, figs. 1 to 10. 



To this species of the high Pyrenees I ascribe the following 

 forms, treated by Pilsbry (Vol. XXIV, 286 and following 

 pages) as separate species: Pupa vergniesiana Kstr. and its 

 variety provida West., Papa hospitii Fag., P. clausilioides 

 Boubee, P. aulusensis Fag. and P. petrophila Fag. 



The basis of my treatment is similar to that already dis- 

 cussed under A. bigerrensis. The original diagnosis of the 

 species need not be supplemented further, except by saying 

 that the apertural development depends very much upon the 

 geologic constitution of the station, which is further not with- 

 out influence upon the size of the shell. In some localities A. 

 pyrencearia reaches a length of 8 mm., with a diameter of 3.5 

 mm. ; in others, with a diameter of 3 mm., it is only 6 mm. 

 high; and a third, described under the name clausilioides, 

 measures only 2.5 mm. diameter with a length of 7 mm. The 

 shell form also is as mutable as the length. The specimens 

 illustrated in pi. 24, figs. 1, 2, 3, 4, all came from the same 

 place, the Spanish side of the Port de Salau in the Province 

 Lerida, where I collected them close together at an elevation 

 of about 1800 m. They show that the shape may be from 

 narrowly cylindric to bluntly fusiform, the apex more or less 

 acute. The striation of the shell varies a good deal. Along- 

 side of strongly, distantly striate ones, closely and finely 

 striate live, and others in which the kind of striation differs 

 on different whorls, and even almost wholly disappears on the 

 last. The development of the aperture goes through all the 

 stages specified for A. bigerrensis. 



A series of specimens of A. vergniesiana in the Rossmassler 

 collection, received from Charpentier, lies before me, agreeing 



