180 
PALAEONTOLOGY OF NEW YORK 
*•' Styliola fissurella, var. strigata. 
PLATE XXXI A, FIGS. 2, 31 and 32. 
Form a minute elongate, attenuate cone, regularly enlarging from the apex to 
the aperture. Apex solid. 
Surface longitudinally striated, with comparatively coarse strim; sometimes 
with obscure transverse striae or undulations. Length of specimens from 
two to three millimetres. 
The angle subtended by the apex is greater than in the ordinary smooth 
S. Jissurella; the shell is strong, and, while tapering regularly for some 
distance from the apex, appears to be more abruptly expanded towards the 
aperture, and therefore does not present a uniform attenuation. 
The surface striae are comparatively strong and apparently crenulate, while 
in certain aspects there is an obscure appearance of undefined transverse undu¬ 
lations. The more marked forms of this variety have been found associated 
with Tentaculites gracilistriatus and Goniatites plebeiformis in the shaly laminae of 
the Goniatite limestone. 
Formation and localities. In the Marcellus shale and in limestone concretions 
in the shale, associated as above, at Cherry Valley; and in laminated shale at 
West Winfield, Herkimer county, N. Y. 
Styliola fissurella, var. obsolescens. 
PLATE XXXI A, FI£. 33. 
Shell an extremely elongated cone, with the apex obtuse or slightly bulbiform; 
gradually enlarging for about one-tliird or more of its length, thence becom¬ 
ing more nearly cylindrical towards the aperture. 
Surface obscurely striated longitudinally, and under ordinary conditions appear¬ 
ing smooth; transverse strise not observed. Length about four mm. 
This variety, in its general form, resembles the Tentaculites intermedius of 
Barrande, but it is without the transverse striie which are seen in that species. 
It occurs in the shales with the smaller forms of > 8 . fissurella and Tentaculites 
