[marrmew] ORDOVICIAN SYSTEM ON THE ATLANTIC COAST 271 
Fig. 2.—Hyolithes c.f. tenuistriatus, Linrs. Nat. size. a. The conical shell, distal 
half showing the ventral side and lip of the dorsal side. 6. The same, 
side view. From McFee’s Point, George River, Cape Breton. See 
page 267. 
Fig. 3.—Movable cheek of a trilobite. Nat. size. Same locality. See page 269. 
Fig. 4.—Holasaphus centropyge, n. gen., et sp. Mag. ? a. Middle piece of the 
head-shield. 6. Pygidium. N.B. The side lobes should have one furrow 
less. From McFee’s Point, near George River, Cape Breton. See page 
268. 
Fig. 5.—Lingulepis acuminata, Conrad? Mag. ?. a. Ventral valve, showing the 
position of the posterior adductor, the lateral and the central muscles. 
b. Dorsal valve, showing the posterior adductor and the lateral and one 
pair of the central muscles, as well as the course of the vascular trunks. 
Sandstone, Beverly, Ont. See page 257. 
