CERATIOCARIS MURCHISONI. 17 



1854. Leptocheles Mubchisoni, Murchison. Siluria, 1st ed., p. 236, pi. 19, 



figs. 1, 2. 



1859. — Siluria, 2nd ed. (3rd, including 



Sil. Syst.), pp. 263, 538, pi. 19, 

 figs. 1, 2. 



1860. Ceeatiocaeis — Salter. Ann. Mag. Nat. Hist., ser. 3, vol. v, 



p. 157. 

 1866. — — Jones. Ibid., ser. 3, vol. xviii, p. 40. 



1866. — — H. Woodward. Geol. Mag., vol. ii, p. 205, 



pi. 10, figs. 8, 9. 



1867. Leptocheles — Salter. In Siluria, 3rd. ed. (4th ed., includ- 



ing Sil. Syst.), p. 134, pi. 19, 

 figs. 1, 2. 



1867. — (Ceeatiocaeis) Mubchisoni, Salter. Ibid., p. 237, pi. 19, 



figs. 1, 2. 



1867. Ceeatiocaeis Mubchisoni, Salter. Ibid., p. 516, pi. 19, figs. 1, 2. 



1877. — — (part), H. Woodward. Catal. Brit. Fobs. 



Crust., p. 71. 



1878. — — H.N.8(E. Catal.C. S. Foss.,M. P. G., 



pp. 84, 168. 

 1878. — tybannus — — Ibid., p. 118. 



1885. — Mubchisoni (part), T. B. J. Sf R. W. Third Eep. Pal. Phyl 



lop., Brit. Assoc. 

 p. 339 ; Geol. Mag. 

 Sept., 1885, p. 387 



1886. — — T. R. J.$ H. W. Fourth Eep., Brit. Assoc. 



p. 229; Geol. Mag., Oct. 

 1886, p. 456. 



Some imperfect caudal appendages or spines (telson or style, and lateral spines 

 or stylets) from the Uppermost Ludlow strata, near Ludlow, were figured in 

 Murchison's ' Silurian System,' in 1839, as fish-defences. These were recognised 

 by Prof. F. M'Coy in 1853 as being very similar to some analogous fossils, referred 

 by him at first (in 1849) to a slender-clawed kind of Pterygotus from the Lower 

 Ludlow, at Leintwardine, near Ludlow, but which he afterwards separated from 

 that genus as Leptocheles leptodactylus. M'Coy suggested that Murchison's fossil 

 should be known as L. Murchisoni. 



Prof. M'Coy's observations are as follows: — " As before mentioned, 



figs. 9, 10, and 11 [' Sil. Syst.,' pi. 4; omit figs. 9 and 11], representing the so- 

 called Onchus Murchisoni, Ag., are almost identical in form, size, sculpturing, and 

 all other characters (as far as they are represented in these drawings), with the 

 distinctly didactyle pincers which I have figured (' Brit. Pal. Foss.,' pi. B, fig. 7) 

 from Leintwardine, under the name Lept. leptodactylus If this approxima- 

 tion prove correct, the fossil should in future be called Leptocheles Murchisoni (Ag. 

 sp.)-" ' Quart. Journ. Geol. Soc.,' vol. ix, 1853, p. 13. 



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