IV. NOTES ON ORDOVICIAN TRILOBITES. III. 



ASAPHID^ FROM THE LOWVILLE AND BLACK RiVER. 



By Percy E. Raymond and J, E. Narraway. 



In a previous paper in these Annals we dealt with the Il!(BnidcB col- 

 lected by Mr. Narraway in the vicinity of Ottawa, Canada. The present 

 paper is based largely on fossils collected by him in the same region, but 

 the majority of the specimens figured are in the Carnegie Museum. The 

 Asaphidce of these formations are less numerous and diversified than the 

 IllcBnidcB, and the specimens are not so well preserved- In the present 

 paper Bathyiiriis longispinus, the hypostoma of Bathyiirus extans, the 

 free cheek of Bathynnis spiniger, and the cephalon of Isoteloides homal- 

 notoides are figured for the first time. The cephalon, thorax, and hypo- 

 stoma of Basilicus romingeri have not previously been figured or described, 

 and a new species of Schmidt's genus Onchometopiis is recognized. This 

 latter genus has not previously been reported in this country. 



To the list of trilobites published in our previous paper as occurring 

 in the Black River at Ottawa should be added Cyphaspis trentonensis 

 Weller and Isoteloides honialnotoides (Walcott). Bathyunis extans should 

 be removed from the list, and Asaphus romingeri Walcott should read 

 Basilicus romingeri (Walcott). 



The drawings on the plates were made by Mr. Sydney Prentice, and 

 the photographs are by Messers. A. S. and L. S. Coggeshall. 



Family BATH YURI D^ Miller 



Genus Bathyurus Billings. 



Bathyurus extans (Hall). 



Plate XV, figures 7. 8; Plate XVI, figure 5- 

 Asaphus? extans Hall, Paleontology New York, I, 1847, 228, pi. 60, figs. 2a-2c ; 



Third Annual Report New York State Cabinet Natural History, 1850, 174, 



pi. 3, figs. la-ic. 

 Asaphus? nodosLrialus Hall, Paleontology New York, I, 1847, 248, pi. 61, figs. 



la, lb. 

 Bathyurus extans Billings, Canadian Naturalist and Geologist, IV, 1859, 364; 



Geology Canada, 1863, 153, fig. 114. — Clarke, Paleontology Minnesota, III. 



ii, 1897, 722, fig. 37. 



46 



