92 THE NAUTILUS. 
tions through. Naere livid or bright pink. Width 2 in. length 1 
in. diam. 2 in. 
Habitat: Suwannee River, Madison Co., Florida. 
Remarks: A large series of this peculiar shell shows considerable 
variation in strength of, and area covered by the plications, sharp- 
ness of the umbonal ridge and color of nacre. It cannot, however, 
be mistaken for any other species. Its natural place is between 
Unio subtentus Say and Unio penicillatus Lea. We name it in 
honor of our esteemed conchologist Mr. Bryant Walker of Detroit, 
Mich. 
POLYGYRA FERRISSI n. sp. 
BY H. As PRESBRY. 
Shell resembling Polygyra dentifera Binn. in size and general 
form. Imperforate, thin, glossy, last two whorls of a very bright 
chestnut color, becoming light green on the earlier whorls. Spire 
very low, convex. Whorls 43, all rather convex, the first minutely 
rugose, granulate, following whorls of the spire slowly widening 
arcuately striate and sparsely granulate, the granules oblong, 
generally upon the striz; last whorls rapidly widening, a trifte 
constricted behind the peristome, very little descending in front, 
sculptured with fine, rather low striz of growth and very fine, sub- 
obsolete close spiral impressed lines; base very little impressed at 
the center. Sutures well impressed throughout. Aperture oblique, 
wide-erescentic ; peristome white, shading through pink to a broad 
purple band at the margin, very broad and flatly reflexed, appressed 
over and closing the umbilicus; parietal wall with a transparent 
film between the lips, and bearing a small oblique tooth nearer to 
the termination of the outer than to that of the basal lip. 
Alt. 13, greatest diam. 21:5, least 18 mm. 
Alt. 11, greatest diam. 20, least 16°5 mm. 
Klingman’s Dome and Mirey Ridge, Great Smoky Mountains 
(between Tenn. and N. C.). 
Mr. Jas. H. Ferris found this very beautiful Helix during his 
summer journey in the Great Smoky range this year, with the 
banded form of Polygyra Andrewse, a very dark, unicolored form 
of the same, P. Clarkii of extraordinary size, and other interesting 
snails. 
P. Ferrissi is intermediate between several very distinct Helices. . 
It has the convex green and granulate inner whorls of P. sub- 
palliata Pils., the fragile substance and flat, wide lip of P. dentifera 
Binn., and the sculpture of the last whorl somewhat like P. appressa 
perigrapta Pils. 
The combination of these characters, together with the deep, rich 
reddish chestnut color of the body-whorl, emphatically negative a 
reference of the specimens to any of these species. The half-grown 
shell, 14 mm. diam., has an umbilicus 1 mm. wide and is very 
obsoletely angular at the periphery. 
