266 Dr. R. H. Traquair—Devonian Fishes of Canada. 
in length, of which five are occupied by the head. The mandible 
measures four inches in length; small conical teeth are seen along 
the dentary margin but the large laniaries are covered up. ‘The 
free surface of the scales is ornamented with very fine, close, wavy 
ridges, sometimes irregular or contorted, but mostly longitudinal 
and tending to converge posteriorily, while they are also often 
branching and interrupted. In front of the striated portion there 
is a narrow, semicircular, or crescentic area of small tubercles. 
The scale-ornament is more delicate than in the Scottish G. paucidens 
and G. leptopterus, to which the fish is evidently closely allied. 
Here again specific identification is a matter of conjecture, as 
there are no marks by which it can be positively identified with 
the small fish described by Whiteaves as G. Quebecensis, seeing 
that it shows neither fins nor configuration of the body, on which 
characters Mr. Whiteaves’s diagnosis was principally founded, while 
his specimen, on the other hand, did not display the ornamen- 
tation of the scales or cranial bones. Mr. Whiteaves mentions, 
however, the occurrence of two large scales, showing a sculpture 
resembling that of the scales of G. leptopterus, and which he thinks 
may indicate a second species; he also states that, ‘it is however 
- possible that they may have belonged to large and adult examples 
of G. Quebecensis, and that the specimen upon which that species 
is based may be a very immature individual.” I accept the latter 
alternative in the meanwhile, rather than name a new species 
without sufficient warrant. 
RHIZODONTIDZ. 
Eusthenopteron Foordi, Whiteaves. 
Eusthenopteron Foordi, Whiteaves, Canadian Nat. n.s. vol. x. 1881 p. 31. ‘Trans. 
Roy. Soc. Canada, vol. vi. sect. iv 1889, p. 79, pl. v. fig. 5; pls. vi. vii R. H. 
Traquair, Grou. Mae. (3) vol. vii. 1890, p. 17. A. S. Woodward, Cat. Foss. 
Fishes Brit. Mus. pt. 2, 1891, p. 362. 
The present series of specimens shows the large size attained by 
this fish, two nearly entire examples measuring respectivly 23 and 
24 inches in length, and each would be at least an inch longer were 
the extreme point of the tail preserved. 
Two points I wish to bring forward on the present occasion. 
The first is the presence of a small pineal foramen on the top of 
the skull between the frontal bones, in the very same position as in 
the Osteolepid genera Diplopterus Thursius and Osteolepis in which 
it has been so long known to exist. 
The second is the palatal dentition. There is one large palato- 
pterygoid bone similar to that which I figured nearly twenty years 
ago in Tristichopterus,| and which extends from the vomerine region 
in front to the articulation of the lower jaw behind. Along the 
anterior two-thirds of the outer margin is articulated, a row of three 
ossicles bearing the upper laniary teeth, and thus corresponding to 
the nrandibular internal dentary ossicles on which I long ago showed 
that the laniaries of the lower jaw (except the anterior one) were 
1 Trans. Roy. Soc. Edin. vol. xxvii. pl. fig. 3. 
