﻿COCCOSTEID.E. 



295 



Ges. Wiss. Gottingen, vol. xxx. (1883), p. 17, pi. i. fig. 3, 



pi. ii. fig. 2, pi. iv. figs. 5, 7. — Upper Devonian ; Bieken, 



Eifel. 

 Brachydirus bidorsatus, A. von Koenen, Abh. phys. CI. k. Gesell. 



Wiss. Gottingen, vol. xxx. (1883), p. 28, pi. i. figs. 2, 4: 



Coccosteus bidorsatus, A. von Koenen, Zeitschr. deutsch. 



geol. Gesell. vol. xxxii. (1880), p. 674. — Upper Devonian ; 



Bieken. 

 Brachydirus carinatus, A. von Koenen, ibid. (1883), p. 31, pi. ii. 



fig. 1 : Coccosteus carinatus, A. von Koenen, torn. cit. 



(1880), p. 673. — Upper Devonian ; Bieken. 

 Brachydirus inflatus, A. von Koenen, torn. cit. (1880), p. 674, 



and torn. cit. (1883), p. 26, pi. i. fig. 1, pi. iv. figs. 1, 2, 



3, 6. — Upper Devonian ; Bieken. 

 The type specimens are preserved in the Royal Geological 

 Museum, Gottingen. 



Genus PHLYCTVffiNASPIS, Traquair. 

 [Geol. Mag. [3] vol. vii. 1890, pp. 60 {Phlyctcenius l ), 144.] ' 



Head and trunk broad, the dorsal aspect more or less arched from 

 side to side ; scutes ornamented with stellate tubercules, and those 

 of the upper surface of the head also marked with deep sensory 

 furrows. Elements of cranial shield, except the rostral bone, fused 

 together in the adult, and the occipital bones constituting not more 

 than half of its total length ; median occipital elongated antero- 

 posteriorly, and its anterior end produced between the divergent 

 hinder extremities of the pair of central plates ; no median element 

 over the pineal region, and no foramen ; orbits forming broad notches, 

 not bounded externally. [Arrangement of plates upon trunk un- 

 known, but probably as in Coccosteus.'] 



So far as known, the species of this genus do not exceed those of 

 Coccosteus in size. 



Phlyctsenaspis acadica (Whiteaves). 



1881. Coccosteus acadicus, J. F. "Whiteaves, Canadian Nat. n. s. vol. x. 

 p. 94, woodc. 



1889. Coccosteus acadicus, J. F. Whiteaves, Trans. Roy. Soc. Canada, 

 vol. vi. sect. iv. p. 93, woodc. fig. 2, pi. ix. 



1890. Phlyctcenaspis acadicus, R. H. Traquair, Geol. Mag. [3] vol. vii. 

 pp. 20, 60, pi. iii. figs. 1, 2. 



Type. Cranial shield and detached plates ; Geol. Survey of Canada, 

 Ottawa. 



1 Non Phlyctcenium, Zittel, Xeues Jahrb. 1878, p. 62. 



