30 CHONDRIN.E OF THE PYRENEAN CENTER. 



Var. d. (pusilla'). It is this shell which received from M. 

 de Cliarpentier the name of Pupa bigorrieiisis. It is smaller 

 than the preceding variety [tenuimarginata] ; its peristome is 

 less \videned; and the aperture, of which the basal angle is 

 almost effaced, is less lengthened. The effacement of this in- 

 ferior angle loses all really characteristic importance by its 

 inosculation with the type ^ [that is, the typical megacheilos, in 

 which the aperture is somewhat angular at the base] equally 

 in the four varieties. It only forms an individual variation 

 which dominates the type at Bagneres de Bigorre, whilst it is 

 the type which dominates at la Preste (Pyr.-OrientaL). 

 Length 7-8, diam. 2% mm. Central Pyrenees. 



Des Moulins' figure, copied in pi. 2, fig. 3, shows a fourth 

 fold in the base. The specimens from Bigorre (received from 

 Locard, and from other sources), do not show this fold. 



Perhaps the name pusilla should be used for this species, 

 since it was that adopted by Des Moulins ; yet as pusilla, and 

 bigorriensis were published simultaneously (as above), it may 

 not be necessary to reject the selection of the second by nearly 

 all subsequent authors. Rossmaessler states that he received 

 pusilla from the Pyrenees from Parreyss in 1845 under the 

 name P. consobrina (Iconogr., iii, 1859, p. 108). 



Pupa moquiniana is ranked as a variety of bigorriensis by 

 Westerlund. There does not seem to be much difference. 



Var. moquiniana, Kiister. PL 2, figs. 8, 9. The shell is elon- 

 gate, rather obtuse, conic-cylindric, rimate, finely rib-striate, 

 the stria? rather oblique, having a silky luster, dark reddish- 

 brown, the apex rust-yellowish. The 7-8 whorls are flatly con- 

 vex, contracted towards the base, joined by a simple, slightly 

 impressed suture, and increasing in height very gradually. 

 Neck flat, compressed at the base, rounded, sometimes quite 

 keel-like, whitish; also the rest of the neck is light flesh- 

 colored, with 4 unequal whitish streaks from the folds show- 

 ing through. Aperture wide, rust-reddish, vertical, higher 

 than wide, with 9 unequal folds in the contracted throat : two 

 on the parietal w r all, the inner one far within, small ; 2 on the 

 columella, the upper one much larger, sometimes emerging 

 far ; 5 in the palate, the upper one small, far within, like the 

 rest in this place, elevated tooth-like; the 2d, 3d, and often 



