FISHES OF THE CARBONIFEROUS SYSTEM. 133 
Trranicutuys Acassizu, Newb. 
Plate I, Figs. 1, 2; Plate H, Figs. 1, 2; Plate IV, Fig. 4. 
Cranium about four feet broad at the occiput, triangular in outline, 
three feet or more in length, the nasal portion being imperfect in all the 
specimens known. ‘The surface of the cranium is smooth or somewhat 
granulated, and is marked by incised lines, as is the cranium of Dinichthys ; 
put these lines form a different pattern. The supra-scapulas of Owen— 
which should, perhaps, be regarded as supra-clavicles—are rhomboidal or 
trapezoidal in form and are about fifteen inches in the longest diameter. 
The claviecles are two feet in length by eight inches broad in the middle, 
strongly turned forward and narrowed at the lower end. The mandibles 
are from two and a half to three feet in length, subeylindrical or subtrian 
gular rods of bone, roughly rounded or pointed behind and gently curved 
upward at the anterior extremity, where the upper surface is excavated by 
a deep groove, which is broader and more shallow anteriorly, giving to the 
extremity of the jaw the form of a gouge. 
The suborbital bones are triangular in outline, sixteen inches or more 
in length, the anterior end pointed, the posterior rounded, and the upper 
margin excavated in a broad sinus around the eye. The surface is marked 
by two intersecting curved lines similar to those on the corresponding bone 
of Dinichthys. 
The figures given on PI. I are inside and outside views of the cranium 
drawn from photographs, and are about one-ninth the natural size linear. 
The type specimen is now in possession of the Museum of Comparative 
Zoology at Cambridge, Mass., to which it was given by Prof. Alexander 
Agassiz. 
Trranicutuys Crarki, Newb. 
Plate Il, Figs. 3, 4; Plate III, Figs. 1-4. 
Cranium triangular in outline, four feet four inches in breadth across 
the occiput, surface smooth or granular, marked by incised lines, which form 
a pattern indistinetly shown in the specimens yet obtained ; supra-scapulas 
subrhomboidal in outline, twenty inches in width by thirteen inches in 
antero-posterior diameter; clavicles twenty-two inches long by eight inches 
