18 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Formation and locality: — This species is quite common in the Niag- 
aran at Wauwatosa, though not nearly so common as B. cuniculus. 
BUMASTUS DAYI, sp. nov. 
Plate 1, fig. 8-10. 
The Day collection contained two fine specimens labeled sp. nov., 
and as they have proven to be such I have named them in honor of 
the collector. The specific characteristics are: — cephalon and pygi- 
dium short and convex, eyes large and far back, no lip or concavity 
at the front of the glabella, though there is one at the sides of the free 
cheeks, dorsal furrows of the cephalon long, reaching the pits in front 
of the eyes. 
Thorax of ten segments, axial lobe very wide, furrows shallow. 
Pygidium short and evenly convex, with only a trace of a concave 
margin. 
It will be at once noted that this species is much like B. niagarensis, 
but has large eyes far back, and the pygidium is shorter and with less’ 
depressed margin. It differs from B. cuniculus in having long in- 
stead of short dorsal furrows on the cephalon, and in lacking the rim 
at the front. Of the species found near Chicago, B. chitagoensis 
(Weller) is very similar to this but that species has a much shorter 
and more abruptly deflected cephalon. 
Measurements: — The type is 46 mm. long; cephalon 19 mm. long, 
26 mm. wide; eye 7 mm. long and 2 mm. from posterior margin; 
thorax 14 mm. in length; pygidium 23 mm. long, 25 mm. wide. A 
large cephalon is 34 mm. long, 46 mm. wide; eye 11 mm. long, 4 mm. 
from posterior margin. 
Formation and locality: — Quite common in the Niagaran at Wauwa- 
tosa, Wisc. 
BUMASTUS DECIPIENS, sp. nov. 
Plate: 4; “figs, 2: 
Exceedingly like B. day? is a species of which the collection contains 
only five or six specimens, two of which are approximately entire. 
The specimens are of about the same size as the smaller ones of B. 
dayi, and the principal difference between the two is that B. decipiens 
