1880.] LAND-SHELLS OF MENTON. 113 



species is found near Menton, is interesting, as the different forms 

 seem to be fairly constant in their several localities. On the sunny 

 hill of Grimaldi a true dwarf form is abundant, living with a similar 

 dwarf variety of H. vermiculala. Round Menton generally, and up 

 to a considerable height, it is an ordinary form ; near the summits 

 of the mountains, at 3000-4000 feet, it is a gigantic tumid form, 

 not very common, reminding me very much of Algerian specimens. 

 I could see no trace of the species in the lower strata of the " Couche 

 Marneuse " of Cape Mortela (zone of H. paretiana) ; a rather large 

 form abounded, however, at about 5 feet or so below the surface, 

 with other common existing shells of the country. 



Subvar. nana. Alt. 21 1, diam. 25 millim. Found only on the 

 hill of Grimaldi. 



Subvar. alticola. Alt. 43, diam. 46| millim. Summits of the 

 neighbouring Alps, and a similar, somewhat smaller form from near 

 the surface of the " Couche marneuse " of Cape Mortela. 



Typical form. Alt. 30|, diam. 31 millim. Abundant every where 

 near Menton, up to about 2000 feet. 



Measurements below, from Pfeiffer, Mon. i. p. 241 : — 



Diam. maj. 41, min, 32, alt. 32 millim. 



li. minor— diam. maj. 28, niiu. 23, alt. 22 (spec. Azor.). 



Helix (Pomatia) aperta. Born. 



This is a small form, to be found here and there round Menton ; 

 by no means common. 



Alt. 21|, diam. 19J miUim. Subwraritime zone, Menton. 



Subvar. ampla. I found one or two specimens only, near the sur- 

 face of the " Couche marneuse " of Cape Mortela; like the preceding, 

 it does not appear to exist lower down, in the zone of H. paretiana. 



Alt. 25i, diam. 26 millim. 



Below I give measurements of Pfeiffer, in Mon. i. p. 25 : — 



Alt. 27, diam. maj. 26 millim. 



Helix (Macularia) vermiculata, Miiller. 



An ordinary form ; is plentiful all round Menton up to a certain 

 altitude, beyond which it does not appear to exist. It is also common, 

 near the surface only, in the " Couche marneuse " of Cape Mortela 



Alt. 22, diam. 29^ miUim. 



Var. grimaldiensis, nov. 



A remarkable dwarf form, apparently constant, as I found some 

 hundred specimens on the hill of Grimaldi, all in the same locality. 

 Spire varying, but usually more produced than in typical form ; last 

 whorl more rounded, scarcely subangulate, more convex at base; 

 aperture less produced, with the columellar margin less oblique and 

 more callous ; very variable in its coloration, if any thing a trifle 

 smoother, thicker, and more callous. 



Type of var. AU. \7h, diam. 22| millim; another specimen, alt. 

 16, diam. 21| milhm. 



I found, near Roquebrune, a single specimen, some feet below the 

 Proc. Zool. Soc— 1880, No. VIII. 8 



