208 A MANUAL OF AMERICAN LAND SHELLS. 



Animal (see p. 205) lead-color, darker on head. 



Jaw very arcuate, of almost uniform breadth, ends blunt; anterior 

 Fig. 218. surface with transverse striie; concave margin simple, with 

 a well-developed, blunt, median projection (Fig. 218), 

 Lingual membrane very broad, composed of 87 rows of 



Jaw of Zonites 



fuiiginosus. 129 (64-1-64) loug, slcuder teeth each ; centrals tricuspid ; 

 laterals 4, bicuspid, in a straight, transverse row; marginals aculeate, 

 in a somewhat crescentic row. Another membrane had 57-1-57 teeth 

 (Terr. Moll., V, Plate II, Fig. 1). 



Genitalia, as well as complete anatomy, figured in Terr. Moll. U. S., 

 I, Plate IX, Fig. 4. There is a peculiar glandular structure around 

 the vagina. The penis sac is long and narrow, tapering above into the 

 vas deferens. The retractor muscle is inserted at about its middle. 

 The genital bladder is large, oval, on a long duct. The peculiar acces- 

 sories to the penis sac of capnodes, Iwvigatus, inornatus, and friahilis are 

 wanting. 



I have in my cabinet a large reversed specimen. 



Zonites friabills, W. G. Binney. 



Shell very globose, transparent, brittle, thin, sometimes thick, shin- 

 FiG. 219. iug, reddish ; spire very short, conic ; whorls 5, convex, 



lightly wrinkled, rapidly increasing, the last very large 

 and ventricose; suture moderate; aperture circular, 

 equally high and broad, within bluish and slightly 

 thickened by a very thin white callus ; peristome 

 Zonites friahilis. simple, sharp, thin, at its junction with the body- whorl 

 violet-colored and reflected, so as to cover a portion of the small and 

 deep umbilicus ; the parietal wall of the aperture is covered with a 

 light violet-colored callus. Greatest diameter 26, lesser 20""" ; height, 

 13""". 



Helix friaUlis, W. G. Binney, Proc. Acad. Nat. Sci. Phila., 1857, 187; Terr. Mon.,iv., 



106, pi. Ixxx, fig. 2.— Pfeiffer, Mon. Hel. Viv., iv, 346.— Bland, Auu. N.'Y. 



Lye, vii, 126. 

 Helix luGubraia, Pfeiffer, Mou. Hel. Viv., iv, 68, vi, 132; Mai. Bliitt., 1858, 32, not 



of Say. 

 nijalina friahilis, Tryon, Am. Journ. Conch., ii, 247 (1866). 

 Zonites friahilis, W. B. Binney, L. & Fr.-W. Sli., i,287, fig. 514 (1869); Terr. Moll., 



V, 101. 



The species belongs to the Interior Eegion, but reaches its greatest 

 develoi)ment in the vicinity of Wabash County, Illinois. I have also 

 received it from Indiana, from the northern and northeastern counties 

 of Kentucky, from Franklin County, Tennessee. In the southwesterly 



