488 Canadian Record of Science. 
gives to our species somewhat the appearance of an Ampyx- 
In Ampyx, however, the spine springs from the front of the 
glabella, and in some species is much longer than that of 
LL. spiniger. 
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igi 
TS SAN IAUS 
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NaN AURART 
CM ITTTTTIVE: 
REFHRENCH TO FIGURES. 
Fig. 1. Leptoplastus stenotus. Ang. After Angelin. 
“ 2. Leptoplastus stenotoides. N.sp. Mag. %. 2a Middle piece of 
head shield. 2b Movable cheek. 2c Pygidium. 2d 
Hypostome found with this species. From Div. 3a, Long 
Island, Kennebecasis River. 
“« 3. Leptoplastus raphidophorus. Ang. After Angelin. 
“* 4, Leptoplastus spiniger. N.sp. Mag. ?. Middle piece of the 
head shield. From Div. 3a, Long Island, Kennebecasis 
River. 
In Sweden the beds with Leptoplastus are regarded as 
the upper number of the Olenus beds, as distinguished 
from those which carry Peltura and Spherophthalmus. In 
New Brunswick, however, the physical conditions during 
the time when this genus lived were such as to associate it 
more closely with the later fauna. The two species of 
