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. Didl, 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). 



IT. 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 indevtata, 

 and which form its most striking character. The former has five and a lialf 

 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. sxibruincola 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 subnipicola 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, beirtg 

 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 

 Hclicidce. 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 Yatesii, 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, Bland. 



Plate I. Fig. F. 



T. late umbilicata, depresso-subglobosa, tenuis, nitens, translucens, albida, 

 irregulariter striata ; sutura mediocris ; anfr. 5^-6, convexiusculi, ultimus 

 convexior, non descendens ; umbilicus extus late excavatns, perspectivus ; 

 apertura rotundato-lunaris ; peristoma simplex, paululo subincrassatum, ssepe 

 roseum, margine columellari reflexiusculo. 



