44 TRIASSIC FISHES AND PLANTS. 
contains great numbers of bivalve crustaceans (Lstheria), which would 
seem to indicate that it was deposited in brackish water. But little exea- 
vation has been made in this stratum, and it is probable that it will hereafter 
yield other things new to our Triassie fauna 
A description of this locality and of the fossils found there was pub- 
lished by L. P. Gratacap.' A wood-eut figure of a large specimen of fish 
found there is given, and it is regarded as identical with Pal@oniscus latus 
of Redfield. Through the courtesy of Mr. Gratacap I have examined the 
original of his illustration, and I have been permitted to make a draw- 
ing of it, which is now published (Fig. 2). I found it essentially like a 
large number of fishes from Weehawken which are in my hands, except 
that it is larger and broader than any other specimen I have seen. All the 
fishes from this locality have the dorsal and anal fins set far back, the anal 
reaching to or beyond the base of the caudal. This would serve to dis- 
tinguish them from J. latus, but they also differ from that species in the 
greater uniformity in the size of the scales In most species of Ischypterus 
four rows of scales on either side of the line of dorsal spines are nearly 
square; the next eight rows are higher than long; then follow seven rows of 
smaller scales to the median line of the abdomen. In these fishes, however, 
the scales on the side are not conspicuously larger than the others, and there 
is also less difference in their size, going from front to rear. Hence I must 
conclude that they belong to a distinct species from Ischypterus latus, which 
also occurs much higher in the Triassic series. In Mr. Gratacap’s figure 
the number of scales in the vertical rows of the side is represented as twenty- 
three; a number which I have found equaled in only one species of the 
genus, J. ovatus, in which it is twenty-four. The specimen does not permit 
the scales in the widest part to be counted, but immediately anterior to the 
dorsal and anal fins the number is apparently sixteen; this renders it prob- 
able that the number in the anterior rows may reach nineteen, a number 
which may be considered as normal for the genus. 
The posterior position of the dorsal fin, the uniformity in the size of 
the scales, and the unarmed or short-spined character of those of the dorsal 
line clearly mark this species as distinct from any other known. 
1Am. Naturalist, vol. 20, 1886, pp. 243-246. 
