﻿228 ANTIARCHA. 



Bothriolepis obesa, Traquair. 

 1888. Bothriolepis obesus, R. H. Traquair, Geol. Mag. [3] vol. v. p. 510. 



Type. Detached plates of trunk ; Edinburgh Museum. 



An imperfectly known species, of large size. Anterior median 

 dorsal plate carinate ; posterior dorso-lateral relatively short and 

 deep ; posterior ventro-lateral with relatively high ascending lamina. 

 Ornamentation consisting of large, partially fused tubercles. 



Form. 4' Loc. Upper Old Eed Sandstone : Rule Water, near 

 Jedburgh. 



Not represented in the Collection. 



•Bothriolepis canadensis, AVhiteaves. 



1880. Pterichthys (Bothriolepis) canadensis, J. F. Whiteaves, Anier. 



Journ. Sci. [3] vol. xx. p. 135, and Canadian Naturalist, n. s. 



vol. x. pp. 26, 28. 

 1885. Bothriolepis canadensis, E. D. Cope, Amer. Nat. vol. xix. p. 290, 



woodc. 



1887. Pterichthys (Bothriolepis) canadensis, J. F. Whiteaves, Trans. 

 Hoy. Soc. Canada, vol. iv. sect. iv. p. 101, pis. vi.-ix. 



1888. Bothriolepis canadensis, R. H. Traquair, Geol. Mag. [3] vol. v. 

 p. 509, and Ann. Mag. Nat. Hist. [6] vol. ii. p. 496, pi. xviii. 

 fig. 6. 



1889. Bothriolepis canadensis, J. F. Whiteaves, Trans. Roy. Soc. 

 Canada, vol. vi. sect. iv. p. 91. 



Type. Nearly complete individual ; Geol. Survey of Canada, 

 Ottawa. 



A species of moderate size, the head and trunk attaining a length 

 of about 0*17. Head much broader than long, about one half as 

 long as the dorsal carapace of the trunk ; trunk broadly ovate, the 

 sides overhanging the narrowly ovate ventral surface. Proximal 

 segment of pectoral appendages broad, but elongated ; distal segment 

 relatively slender, only slightly ornamented, two thirds as long 

 as the proximal segment ; outer and inner margins coarsely ser- 

 rated. Anterior median dorsal plate as broad as long, more or less 

 keeled in its posterior two thirds ; posterior median dorsal plate 

 longitudinally keeled, the keel rising to a slight eminence near the 

 posterior margin. Ornament consisting of fine rounded tubercles 

 fused into nodose, vermiculating ridges ; those near the edges of the 

 dorsal plates often directed mainly at right angles to the margins. 



Form. S," Loc- Upper Devonian : Scaumenac Bay, Province of 

 Quebec, Canada. 



