1880.] LAND-SHELLS OF MENTON. 131 



are moderately convex, short, regular, increase rapidly in breadth, 

 the upper one closely costulated, the ribs scarcely oblique ; the lower 

 one has these ribs more distant, less crowded and more acutely 

 raised ; the next two, of about equal height and breadth, also in- 

 crease rapidly in breadth, are very convex, the ribs become still a 

 little more acute, more oblique and less crowded ; the antepenultimate 

 has similar ribbing, is much the same in size, only a trifle more 

 tuinidly convex, it has the peculiar character that whilst on the side 

 of the aperture it only just equals the preceding one in width, on 

 the other side it markedly surpasses it : the last becomes abruptly 

 much narrower above, about equal in width to the fourth whorl ; on 

 its centre it is girt with an impressed line, dividing it into two 

 nearly equal portions, the lower of which becomes abruptly narrower 

 and more compressed, and is brought round (or ascends) in such a 

 manner as to peculiarly evert the aperture, and to bring the latter's 

 outer margin right up to the suture, reminding one of the genera 

 Boysia, Scopelophila, &c. ; looking at it from behind the aperture, 

 it ascends so much that, at its termination, it completely hides the 

 antepenultimate whorl. The aperture is much everted, triangular, 

 somewhat contracted by the strong inflection of the outer margin 

 above the middle, caused by the impressed dividing groove of the 

 last whorl. 



Long. 31, diam. 2 millim. 



Type, Indian Museum, Calcutta ; also in coll. MM. Bourguignat, 

 Williams, Fagot, Joly, and Godwin- Austen. 



Clausilia (Delima) punctata, Michaud. 



A rather uncommon and almost invariably broken subfossil form 

 from deposits A, B, C, D. 



M. Bourguignat found it living in the Col di Tenda. 



Clausilia (Delima) viriata, Bourg. (Hist. Claus. France, 

 1877, from the Col di Tenda.) 



Though almost exactly of the same proportions as the preceding, 

 a totally distinct species, it is quite impossible to confuse the two. 

 This form occurred subfossil, with the preceding, in deposits A, B, 

 and C; they are still to be found living together in the Col di Tenda. 



Clausilia (Papillifera) solida, Drap. 



An abundant species from the immediate proximity of the sea up 

 to some 2000 ft. ; at the higher elevations on the " Grand Mont," 

 &c. CI. solida does not exist, indeed Mr. Williams could not find 

 there any representative of the genus, although he searched specially 

 for them. The numerous varieties of this form are some of them 

 very interesting; and the whole group requires special study. I 

 think there can be no doubt M. Bourguignat was right in specifically 

 separating one or two of them. Unfortunately it is quite impossible 

 to identify these closely allied forms without first-rate figures. I 

 noticed that the variety living near the sea had a much darker 

 animal than the form I found high up at the village of Roquebrune. 



9* 



