106 MR G. NEVILL ON THE [Feb. 17, 



ment. I take mine from the base of the outer margin of aperture 

 to the apex. It is quite specifically distinct from the following 

 allied species, which take its place at 3000 feet or so. 



Alt. 7, diam. 15; apert. alt. 6, lat. 7^ millim. Specimen of 

 seven whorls, from Menton. 



Hyalina eugyrtjs, Stabile (Moll. Lugano, p. 51, 1859 ; fide 

 cl. Bomg.=H. cellaria, var. villcB, Stabile, Moll. Pie'mont, 1864, 

 = H. villa, Mortillet, not ofDeshayes, Giorn. Mai. 1853). 



I am indebted for this identification to M. Bourguignat, Mr. 

 Williams found the species rather scarce on the " Berceau " and 

 " Grand Mont," from 2500 to 4000 feet. It has six whorls of 

 very fragile substance, spire almost flat, umbilicus very open and 

 shallow, periphery more compressed than in the preceding, colu- 

 mella much more oblique, &c. 



Alt. 5^, diam. 13 ; apert. alt. 5, lat. 6^ millim. 



Hyalina blauneri, Shuttl. (Mitth. Ges. Bern, 1843, Corsica; 

 = Helix lucida, Drap., var. compressa, Dumont & Mortillet, Moll. 

 Savoie, 1852). 



An abundant form in the submaritime zone ; it does not appear to 

 occur at any considerable altitude, at least near Menton ; we found 

 nothing like it subfossil. Young specimens bear perhaps a faint 

 resemblance to Hyalina fodereana, Bourg. MS. I very much 

 doubt if H, blauneri can be specifically separated from H. lucida ; 

 I have thought it best to do so temporarily. The present form is 

 quite distinct from a more openly umbilicate shell from Lucca, 

 which I received as " H. lucida," but which is nearer H. blondiana, 

 indeed scarcely separable ! 



Alt. 5|, diam. 12^; apert. alt. 4|, lat. 6 millim. Subraar. zone, 

 Menton. 



Animal entirely of a dark slate colour ; sole and sides of foot of a 

 trifle more greenish hue. 



Hyalina maceana, Bourg. (Zonites maceana, Bourg. Descr. 

 Moll. Alpes-Marit. 1869 ; near Grasse; alt. 4|, diam. 13 millim.) 



A well-marked and most distinct species, unmistakable for any 

 other with which I am acquainted. Subfossil, it abounds at Menton, 

 in deposits A, B,C, D ; we found a single specimen in F. It occurs 

 here aud there along the coast as far as Monaco. Mr. Williams 

 found it rather scarce, living on the " Grand Mont," at nearly 

 4000 feet. 



Alt. 5, diam. ]2; apert. alt. 4|, lat. 53 millim. 



Var. PLANORBioiDES, uov. (an potius Hyalina planorbioides, 

 n. sp. ?). 



A singular Planorbis-]'\ke variety with sunken spire ; the last 

 whorl increasing more rapidly in proportion, more compressed at 

 the periphery and (near the aperture) raised above the preceding 



