120 THE ROYAL SOCIETY OF CANADA 
2. Onchometopus obtusus, (Hall). A specimen from the Chazy at 
Isle La Motte,Vermont. In the collection at the University of Vermont. 
3. Bumastus globosus, (Billings). A photograph by Professor 
George H. Hudson of a specimen in his collection from the Chazy at 
Valcour Island, New York. Introduced for comparison with Nileus 
and Brachyaspis. 
4. Nileus affinis, (Billings). An enrolled specimen from the con- 
glomerates at Point Levis, Quebec. The type of the species. C. G.S. 
Mus. No. 889. 
5. Symphysurus illenoides, (Billings). A photograph of the type, 
for comparison with Nileus. C. G. 8. Mus. No. 832. 
6. Isotelus gigas, Dekay. A specimen from the Trenton at Co- 
bourg, Ontario. Notice the long triangular cephalon of this species, 
and the depressed border. C. G. 8. Mus. No. 1786. 
7. Hemigyraspis sp. A form very similar to H. planus, (Mat- 
thew). The cephalon and pygidium are short and wide, the facial 
suture is marginal in front, and the axial lobe is rather narrow. The 
specimen might easily be taken for an [sotelus. It is from a locality 
three miles east of Golden, in the Kicking Horse Pass, B.C., and was 
collected by Mr. R. G. McConnell. 
