NEMATOPTYCHIUS GREENOCKI. LN 
Nematoprycnivs Greenocen, Traquair. Ann. Mag. Nat. Hist. [4], vol. xxv, 
1875, p. 258, pl. xvi, figs. 7—11. 
-—— GRACILIS, Traquair. Proce. Roy. Soe. Edinb., vol. ix, 1877, 
p. 262. 
— GReEENOCKHT, Traquair. Quart. Journ. Geol. Soe., vol. xxxiii, 
1877, p. 577. 
— -- Traquair. Ganoid Fishes Brit. Carb. Form. (Pal. 
Soc., 1877), p. 15, pl. i, figs. 7—11. 
— — Traquair. Proc. Roy. Phys. Soe. Edinb., vol. v, 
1879, pp. 118, 128. 
— — Traquair. Proe. Roy. Soe. Edinb., vol. xvii, 1890, 
pp. 331, 898. 
— Greenock, A. S. Woodward. Cat. Foss. Fishes Brit. Mus., 
pt. 11, 1891, p. 458. 
— = Traquair. Trans. Roy. Soc. Edinb., vol. xlvi, 
1SS/o pe Line 
Description —Vhe two most nearly complete specimens which I have seen were found 
by myself many years ago at Wardie, one of these being represented in Pl. XX VI, fig. 1. 
Its length as it lies is 143 inches, but allowing for the deficiency of the extremities of the 
lobes of the caudal fin its original length was probably two inches more. ‘The other 
one (not figured) is larger, being 16 inches in length as preserved, but in like manner 
its original Jength could not have been less than 18 inches. 
The general shape of the body is elongated, the dorsal and ventral margins in front 
of the dorsal and anal fins being tolerably straight, and the dorsal fin rather far back so 
that we are reminded of the form of a recent pike. The length of the head is greater 
than the greatest depth of the body and is contained over four times in the calculated 
total. 
The osteology of the cranial shield has already been described at p. 15 of this mono- 
graph and illustrated by figs. 7 and 8 of Pl. I. On Pl. XXVI, fig. 3, I give another 
figure showing the internal surface of another cranial shield from Straiton, near 
Burdiehouse, which is interesting in showing the course of the right and left sensory 
canals (s.c.) indicated in relief on the surfaces of the parietal and frontal elements. 
The external facial bones are also represented in the restored figure of the head 
(Pl. I, fig. 11). It will there be seen that the suspensorium is very oblique, the 
operculum (op.) and suboperculum (¢. op.) rather small: the preoperculum (yp. op.), 
represented detached in fig. 4, is of the usual Paleoniscid form, but I have not noticed 
any of the accessory plates which are present in onichthys. he branchiostegal 
plates (47.) are very numerous, the anterior one of each series being specially broad in 
form, but I have not seen any evidence of the presence of a median plate as in 
Elonichthys, Rhadinichthys, ete. ‘The maxilla (mz.), isolated in Pl. XXVI, fig. 5, is 
large and has its broad post-orbital part ornamented by striz, which run parallel with 
the superior and posterior borders, but the oral margin of the whole bone, as shown 
