ZONITES. 



283 



Fi>. 505. 



Zonites Cllltellata, Thomson. — Shell orbicular, depressed, eari- 

 nated, shining, reddish horn-color, with a broad revolving ban! of white 

 at the periphery and sutures; whirls six and a half, rather convex, de- 

 cussated by minute lines of growth ami microscopic revolving lines ; 

 below, these lines are obsolete, the surface is 

 shining, whitish, with a broad reddish horn- 

 colored band below the carina ; suture im- 

 pressed ; aperture oblique, lunate ; peristome 

 acute, not thickened and scarcely reflected 

 at the umbilicus, which is broadly expanded, 

 and shows all the volutions to the apex. 

 Greater diam. 35, lesser 19 ; height 13 mill. 



Helix cullellata, Thomson, MS., W. G, Bin- 



NEY, Terr. Moll. IV, 22, pi. Ixxvi, f. G ; Proc. Acad. Nat Sci. Philad. 

 1857, 185.— Pfeiffek, Mon. Hel. Viv. IV, 347. 



The shell from which the description and iignre were drawn 

 was sent me by Mr. J. H. Thomson from Contra Costa County^ 

 California. The fact of no other specimens having been found, 

 and the strong resemblance of the shell to species of the European 

 group of Z. alhanica and acies, have thrown doubt upon its being 

 reallv an inhabitant of California. 



Zonites cuUeUata. 



Ficr. 500. 



Subgenus OMPHALINA, Raf. 



Shell umbilicated or perforate, dei)ressed orbicular, striated 

 above, shining and smooth below, sometimes uniformly smooth ; 

 last whirl dilated, not descending ; aperture broad, ovate ; peri- 

 stome simple, straight, margins 

 converging. 



Animal (of Z. fuliginosa) 

 nearly twice as long as the 

 diameter of the shell, blackish, 

 or bluish-black, darkest on the 

 head, neck, and eye-peduncles. 

 Eye-peduncles short in proportion to the length of the animal, 

 and set widely apart. Respiratory foramen in the angle formed 

 by the junction of the peristome with the body-whirl. Base of 

 foot whitish, the locomotive band defined by two very fine lines, 

 or furrows. A double, marginal furrow runs along the sides 

 of the foot, from the head nearly to the posterior extremity, 



Animal of Zonites fuliginosa. 



