CALCIFEROUS SANDSTONE. 9 
FOSSIL SHELLS OF THE CALCIFEROUS SANDSTONE. 
Puate II. 
The shells observed by myself in this rock are all univalves, though Mr. Vanuxem 
mentions the occurrence in it of an Atrypa in the Mohawk valley, and one or two species 
of Iingula have been found in the same. No specimens of the latter have come under my 
own observation, either in the rock itself, or in any cabinet or collection of fossils which I 
have examined. Mr. Conran gives the following species : 
7 1. LINGULA ACUMINATA.* 
Lingula acuminata. Conran, Annual Report of 1839, p. 64. 
Shell acute, acuminated at the apex, somewhat gibbous on the umbo, and compressed 
laterally ; basal margin rounded. Length 4 of an inch. 
Position and locality. In a boulder or loose mass of the Calciferous sandrock (See Van- 
uxem’s Report, p. 35). 
8. 1. EUOMPHALUS UNIANGULATUS (n. sp.). 
Pu. III. Figs. 1,1 a. 
Planorbicular, discoidal ; volutions angular above, rounded below ; spire scarcely rising 
so high as the angular ridge upon the upper and outer edge of the last whorl; lower side 
concave ; upper surface striated obliquely from within outwardly towards the edge of the 
whorl ; lower surface even, smooth. 
This shell presents all the essential characters of species of this genus from the Mountain 
limestone : it is prominently marked by the single angular ridge upon the upper and outer 
edge of the whorls, which becomes obsolete towards the apex. The specimen is a cast ; 
but the striz (which are too strong in the engraving) still remain impressed upon it on the 
upper side, while on the lower side it is smooth. The remains of several specimens were 
found in a porous sandy chert or hornstone. 
* Judging from some manuscript notes of Mr. Conran, in my possession, I am 
inclined to think he afterwards referred this shell to the L. attenuata of SowERBy. 
Having never seen a specimen from the sandstone, I can only give this figure from a 
drawing of Mr. Conran (the original specimen being now in the possession of Mr. 
VanuxeEm), in the hope of calling the attention of observers to the subject, and, if 
possible, of obtaining specimens which may be satisfactorily compared. 
Lingula acuminata 
| Patzonrotoey. ] 2 
