ORDOVICIAN FAUNAS. 195 
BUMASTUS TRANSVERSALIS N. Sp. 
SS 
~~ 
Plate XIV., Wig. 14. 
Description.—Head convex, subelliptical in outline, not trilobate, 
much wider than long; the eyes situated posteriorly near the lateral 
margins. ‘Test smooth, with a pair of longitudinally elongate, swb- 
lunate depressions on the transverse line between the eyes, about mid- 
way between the eyes and the median line of the head. Pygidium 
similar to the head in size and outline, perfectly smooth throughout. 
The complete thorax unknown. 
The dimensions of one of the type specimens are: breadth of head 
between eyes, 13.5 mm.; length of head, 6 mm.; breadth of pygidium, 
13 mm.; length of pygidium, 6 mm. 
Remarks.—This species resembles B. trentonensis, but is propor- 
tionately very much broader; in all other respects the two species are 
alike. It has only been observed in the lower or Black River horizon 
of the Trenton limestone. 
BUMASTUS ELONGATUS DN. Sp. 
Plate XIV., Eig. 15. 
At a single locality south of Newton a species of Bumastus has 
been found in the Trenton limestone which resembles B. trentonensis 
in all respects except in the much greater proportional length of the 
parts. A nearly-perfect pygidium having a length of 13 mm. and 
a width of 12 mm. is illustrated. Associated with this elongate 
-pygidium there are fragments of heads which also have similar 
elongate proportions. 
PROETUS LATIMARGINATUS D. sp. 
Plate XIV., Figs. 17-24. 
Description.—Head sublunate in outline, the genal angles produced 
into long, sharp spines. Glabella elevated, broadly subconical, rounded 
in front; lateral furrows nearly obsolete exteriorly, but sometimes 
their position is indicated by dark lines on the surface, which seem 
