1915] PALAEOZOIC FOssILS FROM HUDSON Bay. 33 
Whiteaves (op. cit.) states: ‘A. costulatum would seem to be nearest 
to A. canadense, Billings, the type of Hyatt’s genus Bullingsites, and 
hence may be referable to that genus’. This remark would apply with 
equal force to A. boreale. 
Locality—Lower rapids, Shamattawa river, Manitoba. 
Horizon—Ordovician. 
No. 326 S. Royal Ontario Museum of Palaeontology. 
TRILOBITA. 
BUMASTUS, sp. indet. 
One specimen embedded in matrix showing the interior of the thorax 
and a small portion of the pygidium; also a specimen showing a cast of 
the pygidium with three thoracic rings attached. No portion of a buckler 
is preserved. 
The thorax of the larger specimen is fully 45 mm. wide with ten 
rings 4 to 5 mm. in width. The axis is about 35 mm. wide, but the 
axal furrows are faintly shown and the pleura are broken off. The 
pygidium is rounded and smooth with no evidence of trilobation. 
This specimen evidently belongs to the genus Bumastus, and it 
resembles in a general way B. trentonensis, Emmons, which Ulrich con- 
siders to be identical with Illenus milleri, Billings. The present form 
is, however, much larger and is possibly distinct. In the preliminary 
report these specimens were referred to Illenus americanus, Billings: 
the axis is too broad and the axal furrows too ill defined to confirm this 
identification. 
Locality—Lower rapids, Shamattawa river, Manitoba. 
Horizon—Ordovician. 
No. 424 S. Royal Ontario Museum of Palaeontology. 
