THE NAUTILUS. (a) 
A NEW POLYGYRA FROM NEW MEXICO. 
BY W. He DALE. 
Polygyra miorhyssa n. sp. 
Shell depressed, dark brown with about five and one third rounded 
whorls, the periphery somewhat above the middle of the outer whor! ; 
suture distinct, umbilicus small, deep, narrowing rapidly toward the 
apex ; surface polished, with microscopic revolving striz and fine, 
small, slightly irregularly distributed oblique transverse ridges; 
aperture subcircular with a reflected white peristome continued 
over the body by a thin, translucent callus; within the aperture is 
small, oblique, white parietal tooth, the reflected peristome has an 
obseure thickening inside the peripheral part, and another more 
distinct inside the base. Alt. 8.5, lat. 15.5 mm. 
Habitat: Sierra Blanca, Lincoln Co., New Mexico, Rev. E. H. 
Ashmun and C. H. Tyler Townsend, from localities between 7,500 
and 8,500 feet above the sea. 
This species is one of a group comprising the species described by 
me under the names of Polygyra Ashmuni, pseudodonta, chirica- 
huana and rhyssa, all characteristic of high altitudes in the mount- 
ains of New Mexico and Arizona, and doubtless derived from a 
single original stock. To this P. Levettei also seems allied, or, per- 
haps, is conchologically intermediate between the above group and 
the species like P. Afearnsii. The present species is most nearly re- 
lated to P. rhyssa, which is a coarser, more rugose and lighter colored 
shell and usually of larger size. 
DESCRIPTION OF A NEW AMPULLARIA FROM FLORIDA. 
BY WM. He DALE. 
Ampullaria Pinei n. sp. 
Shell large, thin, with a depressed spire, polished surfaceand five 
rounded whorls separated by a narrowly channelled suture; sculp- 
ture of obscure incremental lines and numerous indistinct low re- 
volving ridges, variably prominent in different specimens ; besides 
these there are very fine, sharp, minute, obscurely beaded revolving 
threads with rather wide interspaces, which are occupied by micro- 
scopic revolving striz; this sculpture is often more or less obsolete, 
but traces of it can usually be found on any specimen; color of the 
