FISHES OF THE CARBONIFEROUS SYSTEM. 117 
was by him placed in the cabinet of Lehigh University. It was evidently 
derived from the Catskill group, and represents a genus and species not 
before met with in America. 
Only the under surface of the head and the anterior half of the body 
are shown in the specimen referred to above. This displays very well 
the plates which cover the under side of the head, the pectoral fins, and 
the scales of the under surface of the body, but leaves the outlines of the 
cranial plates and the posterior fins to be imagined. 
Without more material it is impossible to determine with accuracy the 
generic relations of this interesting fossil Its affinities are evidently with 
Glyptolemus and Glyptopomus, and I have referred it provisionally to the 
latter. The form of the jugular plates, both central and lateral, is almost 
precisely the same as in Glyptolemus Kinnairdi, Huxley;’ but the pectoral 
plates, which are characteristic of this genus, are wanting. In place of 
these, the scaling of the under side of the body reaches forward and fills 
the interval between the divergent bases of the jugulars. The form and 
markings of the scales as well as the ornamentation of the head plates cor- 
respond closely with Glyptopomus minor, Ag, from Dura Den; and as by the 
absence of the pectoral plates it appears to be excluded from Glyptolemus, 
it has seemed to me probable that it belonged to Glyptopomus. Professor 
Husley gives a figure’ of a nearly entire individual of Glyptopomus mimor, 
in which the head is seen from the under side. This fish is about fourteen 
inches long, a little more than half the size of the one before us. The 
-corresponding parts of the body in our fossil and this figure are exceedingly 
like, and yet there are some notable differences. For example, in Professor 
Huxley’s specimen there seem to be two triangular accessory jugular plates 
filling the angle between the converging posterior borders of the principal 
jugulars; whereas in our specimen this angle is occupied by the scales of 
the under side of the body which run up into it. Again, in the specimen 
described by Professor Huxley no lateral jugulars are shown, but the state 
of preservation of the fish is scarcely decisive of their presence or absence. 
They are present in Glyptolemus, ave shown in our fossil, and it has been 
1Memoirs Geol. Survey United Kingdom, Decade 10, p. 41. 
2Tbid., Decade 12, pl. 1. 
