62 CHONDRINA, SECTION SOLATOPUPA. 



Var. pr&historica G. Nevill. The commonest subfossil shell 

 in all the deposits except F ; though varying in countless ways, 

 it always preserves a distinct "facies" from that of the pre- 

 ceding living form [simUis] ; it can invariably be distin- 

 guished by the much stronger and more regular striation, not 

 so oblique, so flexuous, or so inclined to be subobsolete ; the 

 aperture is also invariably smaller and more contracted, less 

 everted as a rule, with both margins straight and parallel, in- 

 stead of more or less rounded ; the folds appear scarcely to 

 differ at all. Long. 14, diam. 4 mm. Type of the var. from 

 deposit B, Menton (Nevill). 



Var. speluncarum G. Nevill. A more distinct and charac- 

 teristic variety than the preceding, which I only found in de- 

 posit F, where it was abundant, and in the interior of the cave 

 itself (as I have already mentioned). A very short, convexly 

 swollen, tumid form, of only 9 instead of 10 whorls, the last 

 being proportionally much broader; striation more like that 

 of the typical form than of the preceding variety; the short, 

 quadrangular, unusually everted aperture, with remarkably 

 thickened and reflected peristome, seems to be its most char- 

 acteristic feature, the margins being more convexly rounded 

 and united by a distinct (instead of subobsolete) callosity. I 

 can see no difference in the folds (or teeth). Long. lO 1 /^ 

 diam. 3y 2 millim. From deposit F (Nevill). Menton. 



Types, Indian Museum, Calcutta. 



Var. Isabella: Caziot. A variety of lengthened shape, very 

 slightly swollen, robust, 11 very slightly convex whorls. It 

 differs from the type especially by the dimensions, length 17- 

 18, diam. 4y 2 mm. 



The typical similis varies between length 9-15, diam. 3-31/2 

 mm. The var. major West, has, length 16 mm., with a diam- 

 eter equal to my variety ; it is thus more obese. The var. isa- 

 belkc approaches var. variegella Ziegler which has been found 

 at Grasse, and which is more ventricose and more distinctly 

 marbled. The variety of the Courmettes has, besides, the 

 depth of the aperture of a dirty yellow color. Some specimens 

 show a single band, such as is characteristic of my var. uni- 

 fasciata. Southern slope of the Courmettes between the tor- 



