1919.] NATURAL SCIENCES OF PHILADELPHIA. 161 



The smallest specimens I have seen come from Spain or from the 

 Moorish range, and have not over 12 mm. diameter and 8 mm. 

 height. 



Helicogena nicoeensis (Fer.) Risso (61, figs. 19, 20). Ferussac 

 described a Helix under this name in 1822, from Nicaea, Greece, 

 near Mount Olympus. His use of the form niciensis for the shell 

 from southern France was later. The former was regarded by 

 Pfeiffer as a variety of Helix desertorum, which is perhaps the reason 

 why no one has proposed a new name for the French shell. 



Helicogena libellula Risso (62, f. 21). This is the yellow 

 mutation of H. nemoralis without bands. 



Helicogena imperfecta Risso (62). A j'-ellow variety of H. 

 nemoralis with the bands indicated by rows of imperfectly connected 

 brown spots or flecks. 



Helicogena olivacea Risso (63). Bourguignat considers that 

 Mortillet erred in regarding H. olivacea as a variety of H. nemoralis. 

 He considers it to be the H. sylvatica of Draparnaud. In this I 

 agree with him, although H. sylvatica lives only in Italy on the con- 

 fines of the Department, near the Col de Tende. 



Helix aspersa (L.) Risso (63). Very common. 



Helix vermiculata (L.) Risso (63). Very common. 



Helix rugulosa Risso (64). This species is really H. vermiculata 

 variety concolor Cristofori and Jan. Bom-guignat referred it to H. 

 lactea, which does not occm- in the region under consideration. Can- 

 traine regarded it erroneously as a synonym of H. muralis Miiller, 

 which also does not inhabit the Department. 



Cantareus naticoides (Drap.) Risso (64). This is the Helix 

 aperta Born, very common at Nice. , 



Helicodonta obvoluta (L.) Risso (65). Helix ohvoluta Miiller. 

 Common. 



Helicigona lapicida (L.) Risso (66). This species seems to be 

 confined to the mountainous part of the right bank of the River Var. 



Helicigona cornea (L.) Risso (66). This is only found in the 

 Departement du Var, localized at Moissac and, according to Beren- 

 guies, rarely. A variety of it is found in the Alpes-Maritimes. 



Hygromia cinctella (Drap.) Risso (67). This is correctly identi- 

 fied by Risso. 



