dou Cincinnati Society of Natural History. 
differs in the following particulars. It is less polished: the color is a 
dark smoky green. The sutures are less impressed, so that the whorls 
have a peculiar, overlapping appearance. The spire of the shell slopes 
away as if the whorls had been cut down, removing their outer con- 
vexity, and giving the shell a peculiar profile. This may be a variety, 
only, of Z. rugeld, but it is a very distinct one. 
Z. andrewsi, W. G. Binney.—This species, which stands in nearly 
the same relation to Z. significans, that the latter does to Z. multiden- 
tatus, occurs sparingly in the same situations as Z. rugeli. An old 
log in these mountain forests may afford a regular treasure-trove of 
rare species, if carefully searched, as I have found as many as five or 
six of the rarer of the above shells in such quarters at once. 
I have lately received from a correspondent some fine shells collect- 
ed at Eureka Springs, Arkansas. Among them are the following 
varieties worthy of special notice. 
M. albolabris, Say.—Specimens of the average size have the spire 
very much depressed, the aperture correspondingly elongated trans- 
versely, and the surface very highly polished. The reflection of the 
peristome is much narrower, so rendered by its being somewhat folded. 
It is a very distinct variety, which I have not before seen. There were 
also, in one of the packages, a var. minor of the same species, having 
the same characters, though somewhat exaggerated. The lip of this 
variety is very narrow. These two varieties are very interesting, as 
the station of the shells is on the underside of rocks, a rather abnormal 
situation of this species which generally inhabits loamy hillsides. 
P. dorfeuilliana, Lea.—Together with typical examples of this shell 
were specimens to which I refer to the variety mentioned by Bland. 
The shells are much larger than the types. They differ essentially in 
the umbilical region, so that the merest novice would detect the differ- 
ence, ‘The superior tooth on the peristome is larger and more deeply 
seated than the inferior one, and the latter, though more developed, is 
much of the same form as in fastigans and troostiana. The parietal 
tooth partakes of the general character of that in Lea’s type of dor- 
feuilliana, but its lower and terminal margins project more perpendicu- - 
larly from the parietal walls. Iam much inclined to consider this a 
distinct species.’’—Bland., Iam satisfied that this is a distinct species, 
or a variety that should receive a distinct name, and I suggest that of 
P. sampsoni, in honor of F. A. Sampson, Esq., who has assiduously 
and understandingly collected the shells of this interesting region. 
P. jacksoni, Bland.—This species is typical, but smaller than speci- 
mens from Hematite, Springfield and De Soto, Mo. 
