1880.] LAND-SHELI.S OF MENTON. 125 



everted, with less oblique columella ; it is, however, too close to be 

 separated, even as a variety. 



Unique (subfossil) specimen in Indian Museum, Calcutta. 



Pupa (ToRauiLLA) quinquedentata. Born. 



Living specimens are most abundant all along the Genoese Riviera, 

 at Monaco, Menton, Alassio, &c. At Menton it is found from the 

 sea up to 2500 feet ; after that it becomes much rarer, but exists up 

 to nearly 4000 feet. There is but httle difference between the sub- 

 maritime form and that from the higher regions ; the latter are gene- 

 rally somewhat smaller. 



Long. 1-4 3, diam. 4 millim. A fine form from Roquebrune 

 station. 



Long. 145, diam. 3^ millim. A rare and remarkably attenuate 

 var., of 11 whorls, from St. Agnes (2500 feet). 



Long. 9^, diam. 83 millim. A common dwarf form from (he 

 same spot. 



Long. 13j, diam. 3| millim. A common cylindrical form from 

 the " Berceau." 



Var. prjEhistorica, nov. 



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 preceding living form ; it can invariably 

 be distinguished by the much stronger and more regular striation, 

 not so oblique, so flexuous, or so inclined to be subobsolete ; the 

 apei'ture is also invariably smaller and more contracted, less everted 

 as a rule, with both margins straight and parallel, instead of more or 

 less rounded ; the folds appear scarcely to differ at all. 



Long. 14, diam. 4 millim. Type of the var. from deposit B. 



Var. SPELT] nca RUM, nov. 



A more distinct and characteristic variety than the preceding, 

 which I only found in deposit 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, qua- 

 drangular, unusually everted aperture, with remarkably thickened 

 and reflected peristome, seems to be its most characteristic 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. 10|, diam. 3| millim. From deposit F. 



Types of all the preceding in Indian Museum, Calcutta. 



Pupa (ToRauiLLA) multidentata, Olivi. 

 =:jP. variabilis, Drap. 



Though more localized than the preceding, a very common Menton 

 mollusk, varying enormously in the number and shape of the whorls 



