76 THE NAUTILUS, 
shell dark livid olive, often lighter near the aperture with a broad 
band near the suture and numerous, narrow revolving bands below, 
of a paler olive; near the base there is usually an area somewhat 
darker ; throat deep livid purple, with a light subsutural band, and 
the smaller bands visible by transmitted light, the peristome bor- 
dered with a conspicuous vitreous red margin, especially on the 
inner lip; aperture rounded above and below, with a thick parietal 
callus, umbilicus narrow and deep. Alt. of shell 60, of last whorl 
58, of aperture 47 ; lat. of shell 65, of aperture 35mm. Operculum 
thin, horny, externally finely concentrically striated, and of a black- 
ish olive-green. 
Habitat: Homosassa River, Florida, collected by Mr. George 
Pine. 
This species is related to A. depressa Say and A. Ghiesbrechti Phil, 
but separated from both by its form, sculpture and color. It is most 
readily recognized by its deep red border to the aperture, wide shell 
and very depressed spire. 
NEW POLYGYRAS FROM WHITE MOUNTAIN, NEW MEXICO. 
BY T. D. A. COCKERELL. 
Polygyra altissima n. sp. 
Shell with 5} whorls, pale yellowish-brown, suture moderately 
deep, spire flattened and low, periphery rounded; apical whorls 
nearly smooth, with little sculpture as far as the middle of the 
penultimate whorl, after which the shell becomes distinctly and 
strongly obliquely ribbed, the ribs near the aperture being particu- 
larly strong; the last whorl bears about 48 of these ribs. Umbili- 
cus narrow and deep. Aperture obliquely semilunar; the peristome 
subcircular except where interrupted by the parietal wall, strongly 
thickened, recurved with a sharp edge, yellowish-white, without 
teeth. No parietal denticle. Diam., max. 12,min.10 mm. ; alt. 6 mm. 
Hab.—Highest summit of White Mountain (Sierra Blanca), 
Lincoln Co., New Mexico, altitude 11,092 feet ; three under a rock, 
Aug. 14, 1898. Collected by Prof. C. H. T. Townsend. 
The specimens are practically alike, and differ greatly from P. 
rhyssa Dall, to which they are most nearly related, and from which 
they are presumably descended—or ascended, I suppose we should 
say, considering the altitude at which they are found! ) 
