^880.] LAND-SHELLS OF MENTON. 



lot 



bouring peaks, the "Grand Mont" (44/5 ft.) and the " Berceau " 

 (35/5 ft.), which were attended with very marked success. A consider- 

 able number of the subfossil species which I found in the deposits of 

 my so-called "Cave period," have been discovered living at high ele- 

 vations in the surrounding Alpes Maritimes, both by Mons. Bourgui- 

 gnat and now by Mr. Williams— such as H. olivoluta, H. dicega, li. 

 niciensis. Pupa obltqva, Hyaliim inaceana, Clausilia punctata, 

 viriata, and bizarellina, &c. ; doubtless many of the others will 

 eventually be also discovered. 



When one attains a height above the sea of approximately 1600 

 feet or so, Clausilia solida and Rumina decollata appear to reach 

 their limit, and Zonites algirus, H. ohvoluta, &c. appear for 

 the first time. A little higher still occurs a fine stout variety of//. 

 niciensis, H. (Campi/leea) cingulata, var., and //. nemoralis ; here, 

 too, a very large, smooth and rounded variety of //. cespitum takes 

 the place of the small, compressed, striate s'ubmaritime variety (or 

 distinct species ?) ; H. cemenclea the place of H. anconcB ; Hyalim 

 eugyrus and H. maceana the place of the veiy distinct species of 

 Byalina abundant near the sea all along this part of the Eiviera. 

 Approaching the peaks of these Alps, one meets with various forms of 

 Fruticicola (section Zenobia), Pomatias patulum, Torquilla avenacea 

 and secale, gigantic varieties of H. aspersa and H. nemoralis, a thin, 

 very variable, and poorly-coloured variety of H. niciensis closely 

 resembling the subfossil variety from the " Balzi Rossi," Cyclostoma 

 physetnm, &c. 



Testacella WILLIAM si ana, n. sp. (Plate XIII. fig. 1.) 

 T. crassa, cretacea, subplanata, ovata, subemaciata, ad basim cequa- 

 liter anguste attenuata rotundata, supra striis increynenli conr 

 centricis valide ac subconfertim sulcata; apex exacte centralis, 

 fere rectus, subverticalis, acute prominens ; columella crassa, haud 

 plana, perarcuata, superne conspicue intorta, in/erne obsolete 

 truncata ; peristoma leviier arcuatum ; superne, ad apiceni termi- 

 nans, lumda triangularis ac profunde incisa existat. 

 Long. 5, diam. 2| millim. 



Of this small species I only found seven specimens, all slightly 

 differing in size (ranging from 4 to 5| millims.) ; Mr. Coombe 

 Wdhams, after whom I have named the species, also found about 

 six or seven, which, unfortunately, I have not been able to examine. 

 We only found the species in Deposit B, nowhere else. It is next 

 allied to T. bisulcata, Kisso, admirably figured by Bourguio-nat ia 

 his 'Moll. Alpes-Marit. publies parRisso,' from which it is well cha- 

 racterized by its peculiarly regular and attenuately comjjressed ovate 

 form, by the perfectly rounded, instead of angulate, base, by the 

 slightly though distinctly more arcuate peristome, by the more 

 arcuate and twisted columella less distinctly truncate at base, but 

 above all by the remarkable, almost vertical, and acutely jjrominent 

 apex, perfectly central, instead of being a good deal everted, and 



