328 



NORTH AMERICAN INDEX FOSSILS. 



Helderbergian-Onondaga of New York, New Jersey and Canada. 



185. D. (Synphoria) anchiops (Green). (Fig. 1644.) Devonic. 

 First and second glabellar lobes coalesced ; third pair very small. 



Fig. 1643. Dalmanites pleuro- 

 ptyx. (After Hall.) 



Fig. 1644. Dabnanites anchiops var. 

 armatus. (After Hall.) 



Occipital spine present. Genal spines reaching third thoracic seg- 

 ment (in the variety armatus these spines are obsolete while the 

 occipital spine is longer). Thorax nearly rectangular. Surface of 

 cephalon covered by strong tubercles; rest of test smooth or 

 granular. 



Oriskanian of Ontario; Onondaga of New York, New Jersey, 

 Indiana, Kentucky and Michigan. 



186. D. (Synphoria) calypso Hall. (Fig. 1645.) Devonic. 



First and second glabellar lobes coalesced ; third pair incon- 

 spicuous. Pygidium convex; axis sharply angular, with about 

 15 annulations, surmounted by a row of flattened spines. Pleura 

 fiat, becoming obsolete upon the wide and slightly thickened border. 



Onondaga of New York, Ohio and Kentucky. 



