Raymond : Notes on Ordovician Trilohites. 37 



credits the name to Conrad, in manuscript, and describes and figures the 

 hypostonia anci doublure of a large trilobite. These fragments and the 

 brief description do not serve to define a species. The specimens were 

 from the upper part of the Chazy a little west of Chazy village, New York. 

 From what is now known of the Asaphida of the Chazy it seems most 

 probable that these fragments belong to what is now known as Isoteliis 

 harrisi Raymond. As this can not be determined, the name Asaphus 

 canalis has no meaning. The species described by Whitfield, coming as 

 it does from a much lower horizon, can not by any possibility be the species 

 of which Hall had fragments, and the name canalis should not be applied 

 to it. I therefore propose to name it for the late Professor R. P. Whitfield, 

 to whom we owe a full and accurate description of the species. 



Genus Asaphellus Callaway. 



Asaphellus Callaway, Quarterly Journal Geological Society London, XXXIII, 

 1877, 663. 



This name was proposed by Callaway for Asaphus homjrayi Salter, 

 chiefly on account of the entire hypostoma. It has been considered by 

 Brogger and Schmidt as a subgenus of Niobe, and is indeed very similar 

 to that genus, but differs fundamentally in the course of the suture in 



Fig. 5. Niobe insignis I-innarsson. Outline to show course of facial suture. 

 Thorax supplied. Cephalon and pygidium after Brogger. 



front of the eye In Asaphellus the course of the suture is entirely on the 

 dorsal surface of the cephalon and the two sutures meet in a point in the 

 middle of the anterior margin as in Asaphus and Isotelus. For the sake 

 of bre\ity this will be referred to hereafter as the Isoteliform suture. In 

 Niobe the suture cuts the anterior margin in front of the eye, and follows 

 around the frontal margin as in Nileus. This will be called the Niobiform 

 suture. Among the AsaphidcB with forked hypostomas the Isoteliform 

 suture pre\ails, Asaphus. Onchometopus, Ptychopyge, Isoteloides, and Iso- 



