140 BULLETIN OF THE 
occurred, Specimens were sent to Mr. W. G. Binney, who regards it as “ap- 
parently an albino variety of Zonites indentata.” Specimens were submitted to 
Prof. J. S. Morse, who judged it to be quite distinct from Z. indentata. Other 
specimens were sent to Mr. Dall, who describes it as a new species, and has 
kindly prepared the following notice. 
HYALINA SUBRUPICOLA, n. sp. (Fig. 7). 
This little shell is best described by a comparison of its various character- 
istics with those of H. indentata, Say, as given by Mr. Binney in his Land and 
Fresh-water Shells of the United States (Part I. p. 35). 
H. subrupicola, while exhibiting radiating lines of growth, some of which 
are more conspicuous than others, does not show any such well-marked grooves 
or indentations as are figured by Morse (Land Shells of Maine) in indentata, 
and which form its most striking character. The former has five and a half 
whorls, with a greatest diameter in the largest specimen of 0.14 inch, while 
indentata has but little more than four, with a diameter of 0.20 inch. The 
former is perfectly pellucid, while the latter has a peculiar whitish spermaceti- 
like lustre. H. subrupicola has the last whorl smaller proportionally than 
indentata, and in fact the increment of the whorls in the former is much more 
regular and even. The umbilicus in both is precisely similar. 
The animal of suwbrupicola varies from whitish to slaty ; the granules of the 
upper surface of the foot are remarkably coarse and well marked. The ten- 
tacles are, as contracted in alcohol, hardly perceptible ; the eye-peduncles are 
from the same cause not extended, but appear to be as usual in the genus, and 
to possess normal ocular bulbs. The office filled by these, however, being 
quite as much of a tactile nature as for purposes of sight, the usual rule in 
regard to the blindness of most cave animals does not apply in the case of the 
Helicide. With the exception of H. indentata, this species does not seem very 
near to any of the described American species, and it is totally dissimilar to 
Ammonitella Yatesti, J. G. Cooper, a remarkable form found in caves in Cala- 
veras County, California. 
Hab. —Cave in Utah. Collected by Dr. A. S. Packard, Jr., of Dr. Hay- 
den’s Survey. 
It may be noted that H. indentata does not appear to have been collected 
west of the Rocky Mountains. 
: : 
Zonites petrophilus, Buanp. 
Plate I. Fig. F. 
T. late umbilicata, depresso-subglobosa, tenuis, nitens, translucens, albida, 
irregulariter striata; sutura mediocris; anfr. 53-6, convexiusculi, ultimus 
convexior, non descendens; umbilicus extus late excavatus, perspectivus ; 
apertura rotundato-lunaris; peristoma simplex, paululo subincrassatum, sepe 
roseum, margine columellari reflexiusculo. 
