DOWUKO. 
SILURIAX FOSSILS. 
59 F 
Ekwan river: portage road at falls, three pygidia, each with the 
axis imperfect ; and foot of portage road, one pygidium with the 
axis well preserved. 
BronUns Xiagarcnnis, Hall, from the Niagara limestone of Ontario, 
has a much larger pygidium, with the midiib entire and contracted at 
its raidlength, while the lateral ribs are wider and tlexuous. B. acamas^ 
Hall, from “Hmestcme of the Niagara group at Wisconsin ” and Ontario 
(which S. A. Miller says is a .synonym of B. ocrnuns of Winchell and 
Marcy) has a much larger and more pointed pygiditim, with an “enti- 
rely simple ” and undivided midrib, B. insulana of Hillings, from the 
Anticosti group of Anticosti, is a diminutive species with a pygidium 
less than half an inch wide and wider than large ; while B. 1‘ompilimt, 
Billings, from the Siluiian (Upper .Silurian) rocks at Port Idaniel, has a 
small pygidium with a “longitudinal median lobe in the a.xis.” 
Ceraurus Tarquinius (Billings). 
Chfirurux Tarqiiiniuf, Hillinffs. ISO.". Proc. Portl.nnd Xat. Hi.st. .Soc., vol. i, p. 
121, fig. 22. 
Ekwan river: portage road at fails, ami foot of portage road. At eacli 
of these localities two heads were collected, which seem to be essentially 
similar to the types of C. Tarquiniu.!^, from Port Daniel, in the Museum 
of the Survey, though the characters of tiie posterior angles of the 
cephalon of that .species are still unknown. In the Ekwan river 
specimens, the eyes are opposite the second lobe of the glabella, the 
cheeks are coarsely punctured, and each or the posterior angles of the 
cephalon ends in a short spine. 
