80 TRANSACTIONS OF THE ROYAL CANADIAN INSTITUTE. [VOL. XI 
TRILOBITA 
BuMASTUS cf. 10xus, Hall. 
Plate IV, Figure I9. 
BUMASTUS BARRIENSIS, Hall. Pal., N. York, Vol. II, p. 302, pl. LXVI, figs. 1-15, 1851. 
ILLAENUS (BuMAsTUS) IoxuUsS, Hall. 20th Rep., N. York State Mus., p. 420, pl. XXII, 
figs. 4-10, 1867. 
One broken cephalon agreeing fairly well with Hall’s species. The 
character of the facial suture seems to be slightly different from that 
shown in Hall’s figures. 
Locality—Limestone rapids, Severn river, District of Patricia. 
Horizon—Silurian. 
No. 426 S. Royal Ontario Museum of Palaeontology. 
ENCRINURUS cf. PUNCTATUS, Brunn. sp. 
Plate IV, Figure 20. 
TRILOBUS PUNCTATUS, Brunn. Kjobenh. Sellsk. Skrivt. nye Samml., Vol. I, p. 394. 
ENCRINURUS PUNCTATUS, Emmrich. Neues Jahrbuch fiir Min. Geol. and Pal., p. 42, 
1844. 
ENCRINURUS PUNCTATUS, Vogdes. Trans. San Diego Soc. Nat. Hist., Vol. I, no. 2, p. 67, 
pl. I, 1907. (See this article for extended synonomy and re- ~ 
vision of the genus.) 
Represented by one broken and exfoliated pygidium. The lateral 
margins and the extremity are not preserved; these are restored in the 
figure, but it must be understood that the characteristics of the tip of 
the pygidium and the pleural margins are not known. 
The whole pygidium is about 9 mm. long and of about the same 
width at the anterior margin. The outline is triangular with a sharp 
posterior termination, but the presence or absence of a spine is not 
revealed. The axis is rather more than 4 mm. wide at the proximal 
end; it contains at least 20 segments and probably a few more. The 
distinct pleura are eight in number, but there is a little space in which 
possibly one more may occur. The specimen shows a deep and elongate 
pit between the segments towards the outer margin of the axis. As 
the specimen is decorticated the tubercles are very faintly shown, but 
there is evidence of their occurrence on the fifth, eighth and eleventh 
ring and less distinctly on the fourteenth. The pleural portion shows 
no sign of tuberculation, but considering the condition of the speci- 
men, it cannot be concluded that no tubercles occur. In the number 
of the divisions of the axis and pleurae, the form is near Encrinurus 
punctatus, Brunn. The occurrence of tubercles does not seem to be a 
constant feature, and Salter mentions forms of the species from the 
Ludlow presenting only four, as in our specimen. The apparent absence 
