294 
PALiEONTOLOGY OF NEW-YORK. 
Position and locality. In the shale of this group at Lockport, Rochester and other places, 
and more rarely in the limestone at Lockport. 
661. 5. CONULARIA NIAGARENSIS (n. sp.). 
Pl. LXV. Fig. la- h. 
Compare Conularia quadrisulcata, Miller. 
“ — — Sowerby, Min. Conchology, Vol. iii, 1821, p. 107, t. 260. 
“ — — J. Sow. in Murchison, Sil. System, pag. 626, pl. xii, fig. 22. 
Conularia quadrisulcata. Hall, Geol. Rep. 4th District, 1843, pag. 110, fig. 2. 
Broad, pyramidal, tapering abruptly; angles with deep abrupt channels; centre of each 
side with a shallow scarcely defined depression, which produces a more abrupt bending of the 
striae; transverse striae fine and closely arranged, directed from the angles obliquely to the 
centre, where they are more abruptly bent in crossing the slight depression*^ striae papillose- 
granulate, intermediate spaces marked by longitudinal striae, and grooves which alternate with 
the points upon the transverse striae. 
This species is quite distinct from the lower silurian species ; and since the name of C. 
quadrisulcata was applied by Mr. Sowerby to silurian and carboniferous specimens alike, we 
are at liberty to give another name, till the application of C. quadrisulcata shall be deter¬ 
mined. The Wenlock species, to which Mr. J. D. C. Sowerby has applied the name of C. 
quadrisulcata , is probably identical with ours, holding the same geological position. 
In the Niagara species the transverse ridges are nodulose or papulose, wi|h sharp deep 
grooves between, which are partially crossed on the upper side of the ridge by aq elevated line 
from the papulose point of the ridge. The transverse ridges, as well as the poiqts upon them, 
are comparatively closer together than in the Trenton species, in which the intjpspace is more 
distinctly grooved longitudinally ; while in the Niagara species the ridges are ornamented with 
prominent distinct points, which are likewise shown in the cast, apd the interspaces are nar¬ 
rower and very distinctly grooved. The arrangement of the transverse striae is not equal and 
uniform, being sometimes much more crowded for a short distance than the prevailing character. 
From partial or entire exfoliation of the shell, and from specimens showing the interior of the 
shell, and from casts of the same, there is considerable variety of aspect and character presented. 
Fig. 1 a. A fragment of a small specimen preserving the shell in great perfection. The striae are 
regularly and closely arranged, the intermediate spaces being scarcely wider than 
the ridges. 
Fig. 1 b. An enlargement of this surface, showing the character of the striae and intermediate 
spaces. 
Fig. 1 c. An impression of the exterior of a similar specimen, where the depressions between 
the striae are distinct, and show the longitudinal striae, with the narrow punctured 
depressions between. 
Fig. 1 d . An enlargement of the same. 
