456 Mr. J, Paget on a new Helix and a nev) Hydrobia. 



the suture along the four last whorls. This band is in general 

 very naiTOw ; but in one specimen found by my son Oliver, in 

 Vaucluse, the band is broad, and resembles that of the Bulimus 

 acutus. 



The large variety of the Pupa cinerea (length 15, diam. 5 mill.) 

 is found here abundantly, and is distinguished not only by its 

 size and form (it is more ventricose and fusiform than the 

 smaller variety), but is also strongly and regularly striated. I 

 have noticed some specimens of this Pupa truncated. 



The large varieties of the Pujm quadridens (length 15, diam. 

 4 mill.) and Pupa variabilis (length 16, diam. 4 mill.) are com- 

 mon here, as in other parts of the Mediterranean coast. 



I believe the presence of epidermic spines has not as yet been 

 noticed in any Pupa, yet they certainly do exist in the Pupa 

 doliolum of Savoy, and probably of other countries. I found 

 one adult and several young specimens behind the hotel called 

 Grande Maison between Aiguebclle and St. Jean Maurienne. 

 On the four or five upper whorls they are furnished with epi- 

 dermic ribs terminating just above the suture, in short trian- 

 gular spines (like those of Helix ciliata, though much shorter), 

 forming a projection over the suture, and when fresh, especially 

 if the dew is on them, very evident to the naked eye. I have 

 not yet had an opportunity of comparing these specimens with 

 others in a good condition, but Draparnaud speaks of " a torn 

 appearance of the epidermis," and llossmassler notices the epi- 

 dermic ribs, so that I have little doubt the spines will be found 

 too. My specimens are now six months old, but the spines are 

 still very visible, although shrunk, as epidermic spines and ribs 

 always will do on drying. 



The Planorhis cristatus (Drap.), which is found in the ditches 

 of the Grenouilleres near Nice, abundantly, presents all the 

 varieties which are described by authors under the names of 

 P. nautileus and P. imbricatus. In some specimens the epi- 

 dermic ribs are distant and well marked, and the spines in which 

 they terminate on the keel very evident ; in others the shell is 

 more rounded, the ribs become more numerous, are little more 

 than mere striae, and the spines disappear altogether. These 

 varieties pass into each other by every possible shade of trans- 

 ition. In adult specimens the peristome is continuous, and the 

 mouth stands out qu^ite separate from the penultimate whorl. 

 In some cases the ribs and spines are not merely epidermic, but 

 are marked on the substance of the shell itself. 



All the species of Planorbis, and indeed most of the freshwater 

 shells I have found in Nice, are much smaller than those of the 

 South of France or Switzerland. 



The Cyclostoma elegans of Nice often varies very considerably 



