192 
OSTEOSTJRACI. 
Cephalaspis dawsoni, Lankester. 
1870. Cephalaspis dawsoni , E. R. Lankester, Geol. Mag. vol. vii. p. 397, 
Type. Head and trunk ; Redpath Museum, Montreal. 
A small species, known only by the type specimen. Shield much 
broader than long, with prominent cornua; surface very finely tu- 
berculated. Scaly trunk remarkably small and slender in proportion 
to the shield ; infero-lateral scales with serrated free border. 
Form, Log. Lowrnr Devonian : Gaspe, Canada. 
V 1 
Not represented in the Collection.' 
Fig. 26. 
Cephalaspis dawsoni , Lank.—Dorsal aspect (1), nat. size, and a portion of the 
tubercular ornament (2), much magnified, after Lankester. Lower Devo¬ 
nian, Canada. [Redpath Museum, Montreal.] 
Cephalaspis laticeps, Traquair, 
1890. Cephalaspis laticeps, R. H. Traquair, Geol. Mag. [3] vol. vii, 
p. 16. 
Type . Shield with remains of squamation ; Edinburgh Museum. 
