1 s,i PALAEONTOLOGY OF NEW YORK 



Styliola fissurella, var. strigata. 



PLATK 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 striae ; sometimes 



with obscure transverse stria; or undulations. Length of specimens from 



two to three millimetres. 



The angle subtended by the apex is greater than in the ordinary smooth 

 S. fissurella ; 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 Gonialites 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, FIG. 33. 



Shell an extremely elongated cone, with the apex obtuse or slightly bulbiform ; 

 gradually enlarging for about one-third 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 striae not observed. Length about four mm. 



This variety, in its general form, resembles the Tentaculites intermedins of 

 Barrande, but it is without the transverse stria? which are seen in that species. 

 It occurs in the shales with the smaller forms of S. fissurella and Tentaculites 



