RaYiMond-Narraway : Notes on Ordovician Trilohites. 51 



K.iNiiKMul from tlir Hhick RixiT at the tNpical loralil}- at Newport. 

 This is larger tlum any of those found by Mr. Narraway at Ottawa, the 

 rings are vcr>- faint on the axial lobe, and there are only four pairs of 

 nearly flat ribs on the i)leura. 



In the collection at the Cornell I'nivcrsity Museum there is a specimen 

 labeled Asaphiis canadcusis from the "Bird^eye" at Poland, New York. 

 This specimen, which is figured on rialc X\', fig. 10, is Basilicus romingeri, 

 and a large part of the pygidium, seven segments of the thorax, the 

 hypostoma, and a large, but incomplete free cheek are preserved. The 

 pygidium, which is largely exfoliated, shows six fairly distinct rings on 

 the axial lobe, witli three or four faint ones behind them, and there are 

 six pairs of broad, low ribs on the pleura. The axial lobe of the thorax 

 is narrow, gently convex. The pleural lobes are broad, fiat, gently curved 

 at the sides. The pleura are broad, and have wide shallow furrows 

 which begin at the edge of the axial lobe and extend diagonally backward 

 and outward. Free cheek large, with broad concave margin and a wide 

 genal spine. Hypostoma short and broad, forked, the posterior lobes 

 short and wide, and the scars of muscular attachment strong. Its form 

 is shorter and wider than that of Isotelus, and the body is definitely out- 

 lined from the wings. The test on all parts, including the hypostoma, is 

 covered with irregular striae. 



Specimens from Minnesota. — The cranidia found in Minnesota do not 

 differ in any way from those from Canada. A small specimen shows that 

 the diagonal furrows between the eyes are distinct from those which isolate 

 the basal lobes. The free cheeks have wide concave margins and broad 

 genal spines. One of the two pygidia obtained is small and imperfect, 

 but shows eight rings on the axial lobe and six pairs of ribs on the pleura. 

 The large spe:imen is still more imperfect, but shows a wide concave 

 margin and rather flat ribs. 



Genus AsAPHUS Brongniart. 



Subgenus Onciiometopus Schmidt. 



Onchometopus simplex sp. nov. 



Plate XVI, figures 6-8. 



Associated with the preceding in IVIinnesota is a trilobite which may be 



referred to Onchometopus, as both the cephalon and pygidium lack the 



concave border seen on almost all our American asaphids, and at the same 



time have a smoother glabella and a wider axial lobe than Asaphus. 



Bas licus romingeri, Isoleliis gigas, and a species of Cybele with a glabella 



