184 
PALAEONTOLOGY OF NEW YORK. 
COLEOPRION? TENUIS, n. Sp. 
PLATE XXXII, A, FIGS, 1, 2. 
Fossil a slender elongate, subcylindrical tube; section apparently subelliptical. 
Length of specimen two centimetres, with a width, as presented in the 
stone, of scarcely one millimetre. 
Surface marked by oblique, interrupted, undulating strise, which converge to 
a distinct longitudinal groove extending the entire length of the shell. 
The specimen is an extremely slender subcylindrical tube, which on one side 
presents a distinct groove. The transverse striae, on approaching this groove, 
« 
are turned abruptly forward or apparently toward the larger extremity of the 
shell. The characters presented are not precisely in accordance with the 
generic description of Coleoprion, and I therefore refer the species with doubt 
to that genus. 
Formation and locality. In shales of the Hamilton group, associated with 
Tentaculites bellulus at Arkona, Ontario. C. W. 
COLEOLUS, n. gen. 
COLEOPRION, Hall (1876). Not COLEOPRION, Sandberger (1847). 
ORTHOCERAS, Yandell and Shumard. Geology of Kentucky, p. 15. 1847. 
Shell tubuliform, extremely elongate-conical, straight or slightly curved, 
comparatively thick; inner walls smooth. 
Surface marked by annulating striae or rings which are more or less oblique, 
or sometimes rectangular to the axis: sometimes longitudinally striated. 
A critical study of other specimens of the species described by me as Coleo¬ 
prion tenuicinctum has shown the impropriety of its reference to that genus. 
The oblique elevated striae or annulations, characteristic of the genus, and 
which were apparently interrupted by a longitudinal groove, are found to be 
continuous, the apparent groove being due to fracture from compression of 
the tube, as may be seen in figures 6-8, plate XXXII A, which present the 
