152 HELICID^E. 



and often of a whitish colour, in Steep Holm Island 

 in the Bristol Channel. 



The shells of this species, especially when imma- 

 ture, are often covered with mud or lichens, as is the 

 case with those of Bulimus obscurus. 



Var. i. alba. Shell white or colourless. Lulworth, Dorset- 

 shire (J. G. J.), B.C. Pateley Bridge, Yorkshire (Lister Peace), 

 Y.C. ' 



Var. 2. Boileausiana. " It is distinguished from the type by 

 its smaller size, the larger plication on penultimate whorl being 

 always double, and by the presence of a prominent additional 

 fold at the angle of the columella." Found by Mr. W. 

 Nelson at Dorridge near Knowle, Warwickshire (fide J. W. 

 Taylor). J.C., January, 1879. 



Var. 3. edentnla. " Shell smaller, thinner, smooth and 

 glossy ; striation regular and fine on the upper whorls, gradually 

 becoming fainter and more irregular on the lower ones ; aper- 

 tural plications obsolete." Found " in 1877 at the foot of the 

 rocks near Ingleton, Yorkshire," by Mr. J. W. Taylor. J.C., 

 January, 1879. 



B. Spire short ; mouth horseshoe-shaped, with one or 

 more teeth or folds ; outer lip considerably thick- 

 ened, more or less reflected. Immature shells 

 with transverse plates, and spirally twisted ridge- 

 like folds. 



2. B. RIN'GENS,* JEFFREYS. PL. IX. 



" Body yellowish-grey or slate colour, with several dark lines 

 or streaks along the sides, leaving a clear space in the middle, 

 underneath milk-white ; mantle thick, projecting a little beyond 

 the mouth of the shell ; tentacles short, of a lighter shade than 

 the upper part of the body, larger pair cylindrical and stumpy, 

 rather close together, the bulbs scarcely distinguishable, lower 



* Grinning. 



