NIAGAHA GEOirP. 



295 



Fig. 1 e. The interior of the shell of a large specimen, showing the characters of the preceding, 



but proportionally stronger. 

 Fig. 1 f. An enlargement of the same. 

 Fig. 1 ^. A cast of the interior, from near the base of the shell. In this specimen the tops of the 



ridges appear to be grooved on each side ; while in the middle, where they are more 



abruptly bent, the two sides coalesce in one. 

 Fig. 1 k. The interior of a shell, showing only transverse ridges, except at intervals where 



broken. 



This species appears under so many aspects, from the conditions of preservation, and from 

 other accidental causes, that several figures are necessary to determine its characters. 



Position and locality. In the shale at Lockport, Rochester, VVolcott and other places, and 

 in the lower part of the limestone at Rochester. 



662. 6. CONULARIA LONGA (n. 5J9.). 



Pl. LXy. Fig. 2o-d. 



Elongated, gradually tapering ; angles strongly but not very deeply grooved ; transverse 

 striee or ridges strong, nodulose ; intermediate spaces three or four times as wide as the striae, 

 distinctly grooved. 



This species differs from the precediftg in being less expanded towards the aperture, and 

 much elongated : the interspaces between the transverse striae are proportionally much wider 

 than in the C. niagarensis. Two or three specimens only have been seen. 



Fig. 2 a. A part of a large individual, showing one obtuse angle, with the strong channel, and 



a part of each of the adjoining sides. 

 Fig. 2 i. A portion of the same enlarged. 

 Fig. 2 c, d. A fragment of another individual, and an enlargement showing the character of 



the mould. 



Position and locality. In the shale at Lockport. 



