(w) 
. Ellipsocephalus cf. polymetopus, Linrs. Nat. size 
. Ellipsocephalus grandis Matt., Mag. ? 
PLATE EX, “TRIMOBITA. 
. Protoagraulos priscus, n. gen. et sp., Mag. #7. Middle piece of the head 
shield. From Div. 1, ), 3, Hanford Brook. See p. 139. 
a. Middle piece of 
head shield —— 0}. Same side view ce. Same from the front. 
From Div. 1, 6, 7, Hanford Brook. See p. 139. 
a. Middle piece of the head 
shield —— 0}. A thoracic joint ec. Head in profile. From Diy. 1, 
b, 2, Hanford Brook. See p. 140. 
. Ellipsocephalus galeatus, Matt., Mag. ? —— a. Middle piece of the head 
b. Movable cheek —— ce. Head in profile d. Head with 
part of thorax ——e. Movable cheek ——/f. A thoracic joint, sectioned. 
From Div. 1, 0, 3, Hanford Brook. See p. 139. 
. Avalonia acadica, n. sp. Mag. ¢. Head shield. From Div. 1, b, 3, Han- 
ford Brook. See p. 140. 
