348 
PALEONTOLOGY OF NEW-YORK. 
limestone, which show this character, are the only ones yet observed. The present 
species differs conspicuously from the Niagara species. 
Fig. 1 a. A compressed specimen, which is entire at the apex. 
In two individuals preserving the smooth apex, one of them seems to be per¬ 
forated in the centre ; but this feature may be accidental. 
Fig. 1 b. A broken specimen, which preserves the quadrangular form of the shell. 
Fig. 1 c. Enlargement of the surface as it usually appears under a lens. 
Fig. 1 d. An enlargement of the surface, showing the granulose transverse ridges where the 
shell is entire. This character is rarely well preserved. 
Geological position and locality. In the shaly limestone of the Lower Helderberg 
group : Albany and Schoharie counties. 
Comilaria huntiana (n.s.). 
Plate' LXII A. Fig. 2 a, b. 
Shell elongate, very gradually tapering, sides rounded, angles somewhat 
deeply sulcate ; centre of each side marked by a shallow longitudinal 
impression : transverse ridges curving into the sulci of the angles, and 
angularly bent on the middle of each side ; about eleven in the space 
of three lines, the intermediate depressions marked by longitudinal 
striae which are nearly twice as many in the same distance, or eighteen 
to twenty in the space of three lines. 
The surface of the only known specimen of this species is exfoliated, so that its 
characters are not fully preserved. It differs from the preceding in its greater size 
and more gradually tapering form, as well as apparent greater convexity of the 
sides; while the comparative features, as shown in the transverse and longitudinal 
strife, are quite distinct. 
Fig. 2 a. Figure of the specimen, which is compressed. 
Fig. 2 b. An enlargement of the surface, showing the bending of the transverse ridges^at the 
sulcus on one of the compressed edges of the specimen, and their course across 
the centre of one side ; with the longitudinal striae. ( The figure is enlarged in 
the same degree as that of the preceding species.) 
Geological position and locality. In the shaly limestone of the Lower Helderberg 
group ; Schoharie county. 
