84 



IOWA GEOLOGICAL SURVEY 



canadensis J. F. Whiteaves, Canad. Nat. n. s., 



garded as the characteristic Asterolepid genus of the estuarine 

 aspect of the Upper Devonian, and is represented by four 

 American and some half dozen foreign species in strata of 

 that age. 



Bothriolepis canadensis Whiteaves. 

 (Text-figs. 12, 13, 14) 



1880. Pterichthys {Bothriolepis) canadensis J. F. Whiteaves, Amer. Journ. 



Sci. ser. 3, 20, p. 132. 



1881. Pterichthys (Bothriolejiis) 



10, pp. 26, 28. 

 1885. Bothriolepis canadensis E. D. Cope, Amer. Nat. 19, p. 290. 

 1887. Bothriolepis canadensis E. D. Cope, Origin of the Fittest, p. 323, fig. 62. 



1887. Pterichthys [Bothriolepis) canadensis J. F. Whiteaves, Trans. Roy. Soc. 



Canada, 4, sect. 4, p. 101, pi. 6-9. 



1888. Bothriolepis canadensis R. H. Traquair, Geol. Mag. dec. 3, 5, p. 509, 



and Ann. Mag. Nat. Hist. ser. 6, 2, p. 496, pi. 18, fig. 6. 



1889. Bothriolepis canadensis J. F. Whiteaves, Trans. Roy. Soc. Canada, 6, 



sect. 4, p. 91. 



1892. Bothriolepis canadensis A. S. Woodward, Geol. Mag. dec. 3, 5, p. 484. 



1893. Bothriolepis canadensis H. S. Williams, Amer. Journ. Sci. ser. 3, 46, 



p. 286, text-figs. 3-5. 

 1898. Bothriolepis canadensis E. D. Cope, Syllabus of Lectures on Vertebrata, 



p. 16, fig. 2. 

 1898. Bothriolepis canadensis A. S. Woodward, Outlines of Vertebrate Palreont. 



p. 14, text-figs. 13-15. 

 1904. Bothriolepis canadensis W. Patten, Biol. Bull. 7, p. 113, figs. 1-6. 



1904. Bothriolepis canadensis R. H. Traquair, Monogr. Fishes Old Red Sand- 



stone, Palisont. Soc. Part 2, no. 2, p. 109, figs. 57-59. 



1905. Bothriolepis canadensis W '. Patten, Yearbook Carnegie Inst. Wash., no. 



3, p. 140; no. 4, p. 284. 



1907. Bothriolepis canadensis C. R. Eastman, Mem. N. Y. State Museum 10, 



p. 43, text-figs. 10-12. 



1908. Bothriolepsis canadensis J. F. Whiteaves, Trans. Rov. Soc. Canada, ser. 



3, 1, sect. 4, p. 249. 



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

 length of about 0.17 meter. Head much broader than long, about 

 one-half as long as the dorsal armoring 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 orna- 

 mented, two-thirds as long as the proximal segment; outer and 

 inner margins coarsely serrated. 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 ris- 

 ing to a slight eminence near the posterior margin. Ornament 



