;i4 



and hydroplianous ; with fine stria) of growth ; spire elevated witir 

 the outlines ahnost rectilinear ; apex rather obtuse ; whorls nearly 

 six, a little convex, with the suture but little impressed; last whorl 

 much advancd above over the aperture, which is suborbicular ; lip 

 very thin and sharp, except the columellar portion, which is much 

 thickened and expanded, of a pink color, coalescing with the outer 

 lip in a curve ; umbilicus wanting. 



Mean divergence 80°; greatest breadth .78 inch; least breadth 

 .67 inch ; height .7i] inch. 



Helix fuscocincta. Shell conic ; white beneath a very thick 

 epidermis, which has a narrow well defined blackish zone next 

 below the suture, and next below is pale brown, gradually becoming 

 darker in crossing the whorls to a narrow and well defined very pale 

 yellowish brown zone, which runs next above the suture and along the 

 periphery of the last whorl, the base of which is wholly of a dark 

 brown, — often with numerous hydrophanous white spots ; with striae 

 of growth, which are fine in some and coarse in other individuals ; 

 spire with nearly rectilinear outlines, more or less elevated ; apex a 

 little obtuse; whorls six, a little convex, with a well impressed suture ; 

 aperture somewhat depressed orbicular ; lip rather thin and sharp, 

 with the columellar portion moderately dilated and thickened ; 

 umbilicus wanting. 



The proportions are quite variable, as in the four following ex- 

 amples, the first being a young shell. 



No. 1. Mean divergence 70°; greatest breadth .C inch; least 

 breadth .52 inch ; height .65 inch. 



No. 2. Mean divergence 82°; greatest breadth .83 inch; least 

 breadth .7 inch ; height .79 inch. 



No. 3. Mean divergence 95° ; greatest breadth .725 inch ; least 

 breadth .58 inch ; height .57 inch. 



No. 4. Mean divergence 106°; greatest breadth .81 inch; least 

 breadth .63 inch ; height .57 inch. 



Helix similis. Species similar to //. arhorcoidcs Ad.; but the 

 shell is larger, the whorls arc much higher, and there is an umbili- 

 cus about .04 inch in diameter extending through to the apex. The 

 young of H. cpistylium Mull., also resemble this species, but have 

 no umbilicus, a much more convex base, and an angular periphery, 

 while the periphery of this is very broadly rounded. 



Greatest breadth .6 inch ; least breadth .55 inch ; height .36 inch 



Helix Hollaxdi. Species similar to JI. orboreoide^ A<1. : bi" 



