﻿192 



OSTEOSTRACI. 



Cephalaspis dawsoni, Lankester. 



1S70. Cephalaspis daiosoni, E. R. Lankester, Geol. Mag. vol. vii. p. 397, 

 woodcut. 



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. Sf Loc. Lower Devonian : Gaspe, Canada. 



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. 



