HELICIDJE. 139 



There are some remarks on the anatomy of this 

 snail in the Zoological Journal, i. 174. 



e. TRIGONOSTOMA Fitz. 



Shell subdiscoidal, above flat, beneath umbilicated; brown, 

 one-coloured; mouth trigonal, edge more or less toothed; 

 periostraca hispid, ivith long hairs. 



25.7.HELixobvoluta. Cheese Snail, (f. 31.) Shell 

 orbiculate, flat umbilicated, bald, reddish brown ; 

 spire rather concave ; mouth triangular, edge 

 slightly reflexed, with a small tooth on the inside 

 of the lip ; lips reddish white. 

 Helix obvoluta. Muller, Verm. 27. 



bilabiata. Oliv. Ad. 177. 



trigonophora. Lam. Journ. N. H. t. 42. f. 2. 



holosericea. Gmel., not Studer ; Drap. Moll. 



t. 7. f.27. 29.; Brard, Moll 62. t. 2. f. 16, 17.; 

 Rossm. Icon. 69. t. 1. f. 21.; Ferus. Hist. t. 51. 

 f.4. 



Inhab. among the moss near the roots of trees, in 

 Ditcham Wood, near Brenton, Hants. 



Animal shagreened, foot grey, neck blackish ; ten- 

 tacles black, upper long, lower very short. (Sturm, t. 

 17.) 



This shell was discovered by Dr. James Lindsay 

 (Linn. Trans, xvi. 765.) along with Zonites nitidus, 

 and H. rufescens. It is found for a considerable dis- 

 tance along the chalk escarpment of the South Downs, 

 facing to the North, and although more rare than the 

 other species above mentioned, Dr. Lindsay collected 

 about twenty specimens. It may probably have been 

 introduced with some foreign plants and escaped, for 



