Catalogue of the fossil fishes in the British Museum (Natural History) .. . nament and ganoine, being only marked by oblique transversesulci, each arising from the point of separation of two denticles, andoften implying the complete division of the spine into a series ofsegments, easily detached one from another ; concave margin with-out denticles. No distinct base of insertion. Originally regarded as portions of the jaw of a fish by J. Leidy l andNewberry 2, and compared with the rostral prolongation of Pristis byL. Agassiz 3, these remarkable fossils were first suspected to be Elas- 1 Proc.
Catalogue of the fossil fishes in the British Museum (Natural History) .. . nament and ganoine, being only marked by oblique transversesulci, each arising from the point of separation of two denticles, andoften implying the complete division of the spine into a series ofsegments, easily detached one from another ; concave margin with-out denticles. No distinct base of insertion. Originally regarded as portions of the jaw of a fish by J. Leidy l andNewberry 2, and compared with the rostral prolongation of Pristis byL. Agassiz 3, these remarkable fossils were first suspected to be Elas- 1 Proc. Acad. Nat. Sci. Philad. vol. vii. (1856), p. 414. 2 Pal. Illinois, vol. ii. (1866), p. 84. 3 Proc. Amer. Assoc. Adv. Sci. 1855 (1856), p. 229. 152 ICHTHYODORULITES. mobranch spines by Leidy l and definitely recognized as such bySir Richard Owen 2. They were also described as spines by New-berry and Worthen a; by Cope4 and H. Woodward5 the resemblancebetween their segmented character and that of the Cretaceous Pele-eopterus has been pointed out; and Newberry6 has recently. Edestus minor, Newb.—Coal-Measures, Indiana, suggested that each spine may correspond to a series of spines suchas occurs upon the tail of some species of Trygon. Trautschold 7 hasrevived the original hypothesis of Leidy; and Miss Hitchcock 8compares the fossil with the intermandibular arch of the GanoidOnychodus. Edestus heinrichsi, Newberry & Edestus heinrichsii^ Newberry & Worthen, Pal. Illinois, vol. iv. p. 350, pi. i. fig. Edestus heinrichii, J. S. Newberry, in Ann. Rep. Geol. Surv. Indiana, 1876-78, p. 347. Form. 8f hoc. Coal-Measures : Illinois and Indiana, 1 Proc. Acad. Nat. Sci. Philad. vol. viii. (1857), p. 301. 2 Palaeontology, ed. 2 (1861), p. 123. 3 Pal. Illinois, vol. iv. (1870), p. 350. 4 Form. West (Rep. Geol. Surv. Territ. vol. ii. 1875), p. 244 c. 5 Geol. Mag. [3] vol. in. (1886), p. 6. 6 Ann. New York Acad. Sci. vol. iv. (1888), p. 120. 7
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