462 Canadian Record of Science. 



incompatible with the reference of these species to Lepto- 

 plastus. 



There are reasons for including the Acadian species in 

 Anomoeare. The attitude of the genal spines, directed 

 backward and outward, like the barbs of an arrow, the 

 large pygidium. with narrow, many-jointed rachis, and the 

 broad border-fold to the cheek and pygidium are not char- 

 acters of Leptoplastus (except that a large, bordered 

 pygidium is found in one species of Leptoplastus — L. 

 stenotus) but they are common in Anomoeare. We would 

 therefore transfer the two species from the Kennebecasis 

 valley to Anomoeare as the nearest genus. 



Leptoplastus latus. X. sr>. 



1. Centre-piece of the head-shield. Mag. f . 



2. Movable cheek. Mag. j. 



3. Part of thorax, with pygidium attached. Mag. f . 



The new species of Leptoplastus found in the St. John 

 Basin is remarkable for its wide head ; with the movable 

 cheek the head is nearly four times as wide as long ; the 

 pygidium, as in two out of the three Leptoplaati described 

 by Angelin, is small; and the thorax is compact and rigid, 

 more like Ctenopyge than the Oleni ; the free cheeks are 

 round and tumid as in the Sphserophthalmi, and the eyes 

 are set unusually far back on the head as in the species 

 Sphcerophthalmns alatus. 



This species is more fully described in the volume of 

 " Transactions of the Eoyal Society of Canada " now in 

 press. 



