Items related to Fossil plants of the Triassic rocks of New Jersey and...
Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1888 Excerpt: ...differ from that species in the greater uniformity in the size of the scales In most species of Isehypterus 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 Isehypterus latus, which also occurs much higher in the Triassic series. In Mr. Grataoap's figure the number of scales in the vertical rows of the side is represented as twentythree; a number which I have found equaled in only one species of the genus, I. 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 probable 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. IsCHYPTERUS PARVUS W. C. R. (MS). PI. XIII, Fig. 4. In the manuscript report of J. H. Redfield, now in my hands, I find;i description of a small species of Ischypterm to which he gives the above name, crediting it to W. 0 Redfield. He also refers to the figures given by Prof. Edward Hitchcock1 as illustrating the species. His description is as follows: Fish small and fusiform; head small--less than one'quarter length of fish; scale...
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