REPORT OF THE STATE PALEONTOLOGIST I903 24I 



somewhat from that of the ManHus. In the Manhus the striae are 



strong and usually subequidistant, with from one to several finer 



striae between them. A pedicle valve measuring 19 by 27mm showed 



very little difference in the strength of the striae but a brachial 



valve of about the same size showed it very distinctly, but even here 



not so prominently as on the smaller shells. The Coeymans shells 



are a little more convex. The coarse striae are less pronounced, while 



the finer ones, which vary in number from four to a dozen or more, 



are filiform. 



S. varistriata var. arata Hall 



Shell very convex with its body covered with angular, coarse 

 striae; the sides of these as well as the concave area between them 

 are covered with about six filiform, rather undulate striations. The 

 umbonal region and the somewhat flattened area at the cardinal 

 angle show its derivation from the typical Manlius S . varis- 

 triata, for here the striae are less irregular and the intermediate 

 area is flattened. It was found not very abundantly in the Coey- 

 mans and New Scotland. 



Strophonella? conradi Hall 



The specimens identified with this species are from the Lower 

 Oriskany. The best preserved one measures 35mm by 40mm. The 

 one figured by Hall^ is somewhat smaller, about 29mm by 37mm. 

 The shell is uniformly convex, the greatest convexity being at the mid- 

 dle. It is more coarsely striated than Orthothetes wool- 

 wort h a n u s , the striae being fine and sharp. These striae on 

 exfoliation become rounded while the depressions between them are 

 pitted. On another specimen of the same dimensions and similar 

 striae, the exfoliated striae themselves are very distinctly punctate. 

 No denticulations were noticed on the cardinal area which is poorly 



. preserved. 



S. headleyana Hall 



Only molds of this species were found and these were usually 

 fragmentary. The pedicle valve is distinctly convex at the umbo, 

 with a long, broad and rather shallow concavity toward the front. 



Tal. N. Y. V.3, p1.t6, fig.i3-iS. 



