COCCOSTEIDJ.. 
295 
Ges. Wiss. Gottingen, vol. xxx. (1883), p. 17, pi. i. fig. 3, 
pi. ii. fig. 2, pi. iv. figs. 5, 7.—Upper Devonian ; Bicken, 
Eifel. 
Brachydirus bidorsatus, A. von Koenen, Abli. phys. Cl. 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 ; 
Bicken. 
Brachydirus carinatus , A. von Koenen, ibid. (1883), p. 31, pi. ii. 
fig. 1 : Coccosteus carinatus , A. von Koenen, tom. cit. 
(1880), p. 673.—Upper Devonian ; Bicken. 9 • 
Brachydirus inflatus , A. von Koenen, tom. cit. (1880), p. 674, 
and tom. cit. (1883), p. 26, pi. i. fig. 1, pi. iv. figs. 1, 2, 
3, 6.—Upper Devonian ; Bicken. 
The type specimens are preserved in the Royal Geological 
Museum, Gottingen. _ t 
Genus PHLYCTiSNASHRJS, -Traqwm-. /?V 
/ _ 
[Geol. Mag. [3] vol. vii. 1890, pp. 60 (Phlyctcenius 1 ), 144.] z53fl£ 
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. 
PKlyctsenaspis 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. sectMv.^p. 93, woodc. fig. 2, pi. ix. 
1890. Bldyctcenasfis acadicus , R. H. Traquair, Geol. Mag. [3] vol. vii, 
pp. 20, 6$, pi. iii. figs. 1, 2. 
Type. Cranial shield and detached plates ; Geol. Survey of Canada, 
Ottawa. 
1 Non Phlyct(sniu?n, Zittel, Neues Jahrb. 1878. p, 62. p 
