{WHITEAVES] FOSSIL FISHES OF THE DEVONIAN ROCKS 268 
ventrolateral plates (Whiteaves, loc. cit., pl. ix, figs. 3, 4); and two 
groups of smaller, sparsely tuberculated plates cannot even be pro- 
visionally determined. Further discoveries must be awaited before 
any definite information concerning the disposition of the armature is 
available.” 
(10) Puuycranaspis Acapica (Whiteaves). 
Plate TV, figs. 1, 2, 3 and 4. 
voccosteus Acadicus, Whiteaves. 1881. Canad. Nat. & Quart. Journ. Sci., vol. 10, 
; p. 94, with text figure on p. 95; and (1889) Trans. Royal 
Soc. Canada for 1888, vol. vi, sect. iv, p. 93, fig. 2, and 
pl. ix, figs. 1—4. 
Phlyctenius Acadicus, Traquair. Geol. Mag., Jan., 1890, dec. 3, vol. vii, p. 20; 
and (Feb., 1890), dec. 3, vol. vii, p. 60, pl. iii, figs. 1 and 2. 
Phlyctenaspis Acadica, A. Smith Woodward. 1891. Cat. Foss. Fishes Brit. Mus.,’ 
pt. ii, jp. 295. + 
ss oe A. Smith Woodward. Geol. Mag., Jan., 1892, dec. 3, vol. 
viii, p. 5, pl. i, figs. 7 and 8; and do. for Nov., 1892, dec. 3, 
vol. ix, p. 481, and text figure 1 on p. 482. 
Me a Traquair. Geol. Mag., April, 1893, dec. 3, vol. x, p. 147, 
and text figure on p. 148. 
} 
Type.—Crauial shield and detached plates, in the Museum of the 
Geological Survey at Ottawa. 
In 1891, in the second part of his Catalogue of Fossil Fishes in 
the British Museum, Dr. A. Smith Woodward gives the following 
original description of this species :— 
“The type species. Cranial shield ovoid in form, truncated at its 
hinder border, the outer lateral angles rounded and notched, and the 
breadth between the latter about equal to the total length; the anterior 
two-thirds of the shield gradually arched from side to side, flattened 
or depressed mesially, the posterior portion of the median occipital 
plate rising to a broad, low longitudinal ridge, corresponding to tthe 
Jaterally arched contout of the median dorsal plate of the trunk imme- 
diately behind. Median dorsal plate about three times as long as 
broad, convex in the medial line, but highest in the centre, from which 
point there is a downward slope in every direction, the lateral slopes 
heing most abrupt; anterior border not excavated; the sides parallel 
for more than two-thirds of their length, then converging rapidly into 
a point, with somewhat concave sides. Tuberculations of small or 
moderate size, often arranged in close concentric series, especially upon 
the laterally situated plates.” 
