1880.] LAND-SHELLS OF MENTON. 141 



Alt. 16|, diam. 12; apert. alt. 8 (vix), lat. 7 millim. Specimen 

 from upper stratum, Cape Mortela. Identified by M. Bourguignat 

 as his G. physetum, considered by me merely a form of 0. elegans. 



Alt. 10|, diam. 10|, apert. alt. 7, lat. 61 millim. From the 

 preceding locality ; identified by M. Bourguignat as G. lutetianum ; 

 an elongate subvar. of 0. elegans in my opinion. 



Cyclostoma sulcatum (?), Drap., var. (rar. reticulata, Zgl.). 



The single living specimen already alluded to, found at 4000 ft. 

 on the "Grand Mont," is most certainly quite distinct from G. 

 elegans. There are two described species to which it may belong, 

 C. sulcatum or C. phgsetum ; or, what seems to me likely enough, it 

 may be both ; that is, these two species may prove not separable 

 except as varieties. The specimen does not agree exactly with the 

 subfossil ones identified by M. Bourguignat as his C. physetum. 

 To me it seems an extreme variety, dififering more from the C. elegans 

 type as to the shorter spire, more convex whorls, and globosely 

 swollen last whorl, but less as regards coarseness of the sculpture ; 

 the umbilicus and aperture with its margins seem to be exactly- 

 similar. They differ so widely from Algerian specimens of G. sul- 

 catum that I am in doubt whether both ought not to be separated 

 as C. physetum. Unfortunately I have not got with me any typical 

 French specimens of C. sulcatum for comparison. 



Alt. 1()|, diam. 13^ ; apert. alt. 8|, lat. 7| millim. 



Unique specimen from the "Grand Mont." 



Cyclostoma lutetianum, Bourg. Moll. Diluvium, Paris, pi. iii. 

 figs. 35-37, 1869. 



One of the most abundant shells in deposits A, B, C, D, and E 

 (the genus did not occur at all in deposit F). One of the forms I 

 include under the above heading was invariably to be found where- 

 ever H. paretiana occurred, both at Cape Mortela and Cape 

 Vieille &c., M. Bourguignat identifying it as his C. lutetianum. 

 I did not find in this zone any specimen of what I consider a variety 

 only, and what M. Bourguignat calls G. physetum. 



In deposits A and D especially these two so-called species, vary- 

 ing in every specimen, and running into one another from the extreme 

 of one form to that of the other, were to be found mixed up together 

 under one rock, leaving in my mind not the slightest doubt as to 

 their being varieties of one single species, most certainly quite dis- 

 tinct from C. elegans, possibly extreme varieties of the living form 

 C. sulcatum, or perhaps a distinct species. I think they are very 

 doubtfully specifically separable from the preceding living specimen, 

 which, however, I have thought best temporarily to separate as a 

 variety of C. sulcatum. Specimens from deposit D had a distinct 

 tendency to coarser sculpture than those from other localities. 



Alt- 21i,,diam. 14^; apert. alt. 9, lat. 8^ millim. 



An elongate specimen from deposit D, with the aperture widely 

 detached from the body-whorl. 



Alt. 16i, diam. 12|; apert. alt. 7^, lat. 7 millim. 



