me HAY—VERTEBRATES OF CARBONIFEROUS AGE. [March 16, 
Dr. Dawson, as cited above, but there was practically no descrip- 
tion presented. The figures represent two scales, a small one and 
a portion of a large one. ‘They show the size and form, the 
existence of radiating and concentric lines, and near the centre an 
elongated mark of some kind. 
From the Peter Redpath Museum, in Montreal, through the kind 
offices of Prof. #rank D. Adams, I have received two specimens of 
the scales of this fish, both of which were presented to the Museum 
by Dr. Dawson. Although evidently not the subjects of his figures, 
they may be accepted as authentic representatives of his species. Both 
are large scales, but they differ much in form. One of these, hav- 
ing a part of one side missing, has been almost circular, with a 
diameter of 38 mm. ; the other is oval, with a long axis of 4o 
mm. and a short axis of 33 mm. The large scale figured by Dr. 
Dawson must also have been nearly circular, while the small one 
was ovate. We have here an illustration of the futility of relying 
much on the form and size of scales. 
The scales before me appear to present their inner surfaces. The 
circular scale has an elongated depression, whose posterior end is 
placed very close to the centre of the scale. From this there 
diverge nearly straight rows of elevated points. What we have 
then seems to be merely a cast of the inner surface, the points being 
the fillings of the pits of that surface. Concentric lines occupy a 
large part of the surface, being most distinct anteriorly, very 
indistinct posteriorly. Some evidences of longitudinal striz, or 
radii, are found along the anterior border, where the surface of the 
scale appears abraded. ‘The substance of the oval scale is present. 
Its boss, not very distinctly shown, is in the centre of the scale. 
From it lines of small pits and low folds diverge in straight lines to 
the posterior border. At the border the folds are well shown. It 
seems probable that these folds and rows of pits represent the 
course taken by the furrows of the other side of the scale. In S. 
arenosus, next described, these furrows run forward and branch in 
avery irregular manner. The surface of the oval scale here described 
shows a fine fibrillation whose lines run in various directions, 
apparently without relation to the other markings. The circular 
scale is from the Horton beds of the Subcarboniferous at Horton, 
Nova Scotia; the oval scale is from Pictou, and probably from the 
same deposits. 
