Devonian VKishes of Camphelltown and Scawmenae Bay, WV 
broken on one side, or else distorted by pressure; whereas 
those of CU. Campbeltownensis more commonly retain their 
contour complete. As the name Whiteavesi, having dropped, 
cannot, according to the rules of nomenclature, be again 
applied to a different species of Cephalaspis, | have pleasure 
in dedicating this new one to Mr Jex. 
Phlyctenaspis Acadica, Whiteaves. 
Cocconteun Acadicus, Whiteaves, Trans, Roy, Soc, Canada, vol, vi., 
sect, iv., p. 93, pl. ix, and woodcut, 
Phihychomanpia Acadica, Vraquair, Geol, Mag,, dee, ili,, vol, vii, pp. 20 
and 60, pl. iii,, figs, 1, 2 
Phlyhanoapis Acadica, A. 8. Woodward, Cat, Kous, Vishes British 
Museum, pt. ii, p. 259; also in Geol, Mag,, dee, iii, vol, viii, 
1491, p. 5, 
This collection is rich in remains of Phlyclanaspis Acadicn, 
among which are some specimens which throw fresh light 
upon the structure of this interesting and still imperfectly 
known genus. 
One of them shows a large portion of the ventral shield 
with nearly all its plates im situ, and from it, along with 
detached plates, I have drawn the accompanying restoration, 
which clears up, I think, certain important points recently 
discussed by Mr Smith Woodward, 
This specimen shows the left anterior ventro-lateral 
plate and part of the right one, also the median ventral 
plate and the greater part of the posterior ventro-lateral 
plate of the left side, and finally the left lateral spine 
or cornu in connection with the corresponding anterior 
ventro-lateral, 
The anterior median ventral is not here exhibited, but 
as it occurs detached in another specimen, I have, in the 
figure, inserted it in its place. The median ventral is, how- 
ever, well shown in position, and detached examples of it 
occur showing both outer and inner aspects. Both of these 
median plates closely resemble the corresponding plates in 
Coccostous, 
So does the anterior ventro-lateral (7.1), which is quite 
