10 CHONDRIN^E OF THE ALPIC CENTER. 



Var. caziotana n. n. A variety rather of megacheila than of 

 avenacea; in the latter species the palatal folds are opposite 

 the columellars, and do not reach the peristome, while in 

 megacheilas the stronger palatal folds alternate with the colu- 

 mellars, and one at least, or several, reach the peristome, and 

 this is the case with our variety, which is therefore closely re- 

 lated to the var. maritima. It forms a passage to Pupa mega- 

 cheila, but has not an angular aperture. Alpes-Maritimes : 

 Gorges of Cians, north of Beuil, at 1500-1600 meters eleva- 

 tion, and on the limestones of the plateau de Caussols, in the 

 ravine near the road from Grasse to Thorenc, at the place 

 called le Planesteli, at about 1000 meters (Pupa megacheila 

 var. Idbiosa Caziot, Etude moll. terr. et fluv. Monaco, 1910, p. 

 317, pi. 8, fig. 9). It may perhaps be equivalent to Pupa ave- 

 nacea var. maritima Loc., according to Caziot, t. c., p. 316, 

 footnote. The names labiosa and maritima are preoccupied in 

 Pupa. Caziot 's figures are too small to show any distinctive 

 characters. His description is given above. 



Var. galloprovincialis Margier. Hauteville (Ain). A form 

 said to resemble that of the Tyrol. I have not found a descrip- 

 tion of it, and suspect that it is a MS. name. Mentioned by 

 Caziot, Ann. Soc. Linn. Lyon for 1908, p. 159. 



2. CHONDRINA AVENACEA (Brug.). PL 1, figs. 4, 5, 6. 



The shell is perforate, rimate, cylindric-conic, thin, chest- 

 nut-brown or carob-brown; weakly, rather finely, irregularly 

 striate. Whorls somewhat convex, the last well rounded at 

 base, slowly ascending forward. Aperture with 7 teeth. An- 

 gular lamella low, rather long, either weakly joining the spiral 

 lamella or shorter and discontinuous with the spiral ; the spiral 

 lamella is often rudimentary or absent. Parietal lamella 

 short. Columellar lamella short, horizontal, a smaller, shorter 

 subcolumellar below it. Upper and lower palatal and basal 

 plicas rather short, the upper reaching the peristome, the 

 others a little immersed; frequently a minute suprapalatal 

 plica is developed. Peristome thin, whitish, a little expanded ; 

 parietal callous very thin, transparent. 



Length 6.8, diam. 2.8 mm. ; 7% whorls. 



