Notes on American Land Shells. Boe 
ieee. H&LICODISCUS FIMBRIATUS, DOV. Sp. 
Shell light green color, discoidal or planiform, widely umbilicate, 
consisting of about five whorls, very gradually increasing in size. 
Aperture lunate, and oblique to the axis of the shell. Peristome sub- 
acute, slightly thickened, and darker than the rest of the shell, the out- 
line somewhat sinuous when viewed from the side of the whorl. Spire 
planiform, not rising above the body whorl. Suture deeply and regu- 
larly impressed. Umbilicus exhibiting all the volutions. Whorls or- 
namented with from six to eight revolving ridges, terminating in a 
fringe-like projection of the epidermis, following this arrangement. Two 
or three of these ridges, on the upper side of the body whorl, are often 
of such prominence as to give that portion of the shell a fluted appear- 
ance. In old shells these epidermal fringes are sometimes worn away, 
leaving the ridges upon which they stood. Greater diameter 5, lesser 
4i, height 14 mm. 
In some specimens as many as six teeth may be observed, none of 
which can be seen in the aperture. 
_ Remarks.—This shell, from its form and general appearance, at once 
reminds us of the H. lineatus, Say, the only other known species of this 
somewhat aberrant, but perfectly distinct genus. It has, however, about 
three times the cubic capacity of its relative, and is very different in 
sculpturing and ornamentation. The body whorl is slightly deflected 
‘for a short distance back of the aperture. It inhabits crevices in the 
slates of the Ocoee District, where I have found it at the localities 
above mentioned. The genitalia of this species, of the H. lineatus, 
Z. subplanus, P, harperi, and other rare shells of this region will form 
the subject of a future paper. 
Z. rugeli, W. G. Binney.—This fine new species, first described by 
Mr. Binney, from specimens found by Mrs. Judge Andrews, of Knox- 
ville, occurs somewhat abundantly in moist situations about old logs and 
moss covered rocks, on the flanks of Roan, to a height of 5,500 feet. It 
grows to amuch larger size than Mr. Binney’s type, specimens of the 
larger size being more abundant along the banks of the mountain 
streams. 
This shell is remarkable for its highly polished epidermis, constantly 
recalling the European Z. olivier’, and other species of that group. In 
this regard it is in striking contrast with the other Zonites of like form 
inhabiting this region. As stated above I found this shell in the Ocoee 
metamorphics during my trip of 1877. 
There is a variety of this shell, or perhaps a distinct species, which 
