318 HELIX. 



It has been considered best to revert to Ferussac's name Hclico- 

 gena for this group, as the well known name Pomatia must in any 

 case be abandoned in favor of Cantareus, properly proposed five 

 years earlier. Pomatia, moreover, is etymologically identical with 

 Pomatias, the name referring to the calcareous epiphragm, and not 

 of latin derivation as some have supposed. Strictly speaking, no 

 sectional name is required for this section, as it is the typical group 

 of Helix. 



The species are European in distribution, but the greater number 

 occur in Southern Europe, Northern Africa and Asia Minor. H. 

 aspersa is the most widely dispersed, and has become colonized in 

 many localities in both North and South America, as well as in 

 Australia, etc. Most species of this group are edible and used for 

 food in the latin countries as well as in Turkey, Greece and the 

 Orient. 



{I. Imperforate, solid, malleated, lip expanded throughout ; epiphragm 

 -membranous, CRYPTOMPHALUS). 



H. aspersa Mull., iv, 235. H. aspersa. 



grisea Gmel. secunda Da C. 



variegata Gmel. fluminensis Lang. 



Thin, plicate or striate, lip hardly expanded, Erctella. 



H. mazzullii Jan., iv, 235. H. vermiculosa Morel, iv, 149. 

 crispata Costa not Fer. /. cretacea AVesterl. 



retirugis Mke. (undescr.). H. subaperta Ancey. 

 rugosa Miihlf. mazzulopsis Anc., viii, 238. 



costce Ben. H. subplicata Sowb., iv, 236. 



/. zonata Bgt. H. tristis Pfr., iv, 254. 

 v. quincayensis (Maud.) Bgt. cerasina Sh. 



quincianensis Mauduyt. H. aggerivaga Mab., iv, 255. 



II. Imperforate or umbilicated, the lip hardly expanded; epiphragm 



rigid, calcareous, HELICOGENA. 



Thin, globular, imperforate and unicolored, with large aperture and 

 dark coloration, Cantareus. 



H aperta Born, iv, 254. Southern France to Greece, N. 

 terrestris Forsk. Africa. 



neritoides Ch. v. korsegaelia Bgt., Loc. 



naticoides Drap. v. kalaritana Prunn., Villa. 



