ORISKANY FAUNA OF BECK AFT MOUNTATN 19 



cephalic ornament and the others with none, but possessing highly char- 

 acteristic pygidia (Cryphaeus). It seems therefore very probable 

 that the term Synphoria, introduced by the writer some years 

 ago, in its application to the former group of species having coalescent 

 glabellar lobes, may prove of subgeneric significance in distinguishing such 

 forms from the typical Dalmanites. 



Dalmanites (Synphoria) stemmatus, var. convergens var. nov. 



Plate 2, flg. 8-5 



1892. Dalmanites sp. nov. A. var, Clarke, op. cit. p. 412 

 Not infrequent in this fauna are small pygidia of Dalmanites 

 having the same degree of annulation as Dal. stemmatus but with 

 a more slender and tapering outline. At the posterior extremity, also, 

 there is a short but acute termination. A few cranidia of correspond- 

 ing size show a slight crenulation of the anterior margin. 



Dalmanites phacoptyx Hall and Clarke 



Plato 2, flg. 10 



1888. Dalmanites phacoptyx ^aM und Chrke, Paleontology of I^ew York. 1:51, 

 pi. 9a, fig. 23-27 



This species was founded on some large but incomplete pygidia 

 from the Upper Helderberg (Ulsterian) at North Cayuga, Ontario, which 

 are characterized by their narrow, divided pleural ribs, long, cylindric 

 tail spine and irregularly tubercled surface, some of the tubercles being 

 large and having the form of spinules. These spinules occur without 

 arrangement on the pleural ribs and on some of the segments of the 

 axis. Lesser tubercles are scattered over the surface and are crowded 

 on the sides of the axis. 



A few specimens representing this species have been found in the 

 Oriskany. 



Dalmanites bisignatus sp. nov. 



Plate 2, flg. 6-8 



1892. Dalmanites sp. nov. B, Clarke, op. cit. p. 412 

 Cephalon and thorax not known. 



Pygidium elongate triangular, sloping to a sharp angle which may 

 be extended into a short, flat spine. Axis quite slender and with 



