[RAYMOND] PARALLELISM AMONG THE ASAPHIDÆ 119 
of the facial suture, which is just within the margin in front of the 
glabella. The specimen is from the Richmond at East Selkirk, Mani- 
toba. G.C.S. Mus. No. 7170. 
2. The same specimen. Another view to show the short, wide 
cephalon, the wide axial lobe, and the large eyes. 
3. Brachyaspis alacer, (Billings). Photograph of the type, to 
show the marginal facial suture, the obsolete glabella, and the depressed 
eyes. The specimen is from the Richmond at Charleton Point, Anti- 
costs. CN Gaon ius.) No 2179) 
4,5. Brachyaspis altilis, Raymond. (Nomen nov.) Anterior and 
dorsal views of the type to show the marginal facial suture, obsolete 
glabella, and wide axial lobe. This is the specimen figured by Billings 
in the ‘‘Catalogue of the Silurian Fossils of Anticosti,” p. 26, fig. 9b, 
as Asaphus platycephalus. From the Richmond at English Head, 
Anticosti. C. G.S. Mus. No. 2181. 
6. Megalaspis goniurus, (Billings). A photograph of one of the 
types. The specimen is from the conglomerates at Point Levis, and 
the Museum number is 830. 
7. Isotelus gigas, Dekay. Profile view of an enrolled specimen 
for comparison with Fig. 1. The depressed border is present. This 
specimen is from the Trenton at Hull, Quebec, and is in the Museum 
of the Geological Survey. (Stewart collection). 
8. Nileus perkinsi, Raymond. Photograph of a cephalon for 
comparison with Brachyaspis and Onchometopus. Note absence of 
depressed border, obsolete glabella, and marginal facial suture. This 
specimen is from the Chazy at Isle La Motte, Vermont, and is in the 
U.S. National Museum. 
9. Isotelus gigas, Dekay. This figure is introduced to show the 
long, sub-triangular outline of the cephalon, even in a flattened speci- 
men. Note the very wide axial lobe. This specimen is from the Tren- 
ton at Lake Winnipeg, Manitoba, C. G. 8. Mus. No. 1798. 
Plate 3. 
1. Nileus perkinsi, Raymond. Photograph of the underside of 
the doublure of the cephalon, to show the vertical suture. It has been 
repeatedly. stated that this suture is not present in Nileus and Sym- 
physurus, but it is present in Nileus perkinsi and Symphysurus illænoides. 
In other respects the genera mentioned are close parallels of Bumastus 
and Illenus. The specimen here figured is the same one shown in 
figure 8 of the preceding plate. 
