382 P. E. Raymond — Fauna of the Chazy Limestone. 



furrows. The glabellar furrows in the various species of 

 Pseudosphcerexochus are usually faint, never deeply impressed 

 as in this species. In this last character and in the presence 

 of the median depression of the glabella, it recalls Pliomerops. 

 The glabella is much larger in proportion to the size of the 

 cephalon in Heliomera sol, however, and it is probable that 

 this form must be regarded as intermediate between the two 

 genera. For trilobites with this type of glabellar structure 

 the subgeneric name Heliomera is suggested. 



Locality. — From the Raphistoma layers in the upper part 

 of the Lower Chazy, at Chazy, New York. The type is in 

 the Yale University Museum. 



Paleontological Laboratory, 

 Yale University Museum, June 24, 1905. 



