14 BRITISH PALEOZOIC PHYLLOCARIDA. 



1. Ceratiooabis leptodacttlus {M'Coy), 1849. Plate VI, figs. 4 a, 4 6, 4 c, 5, 6 (?), 



7, 8, 9, and PI. X, fig. 8 (?). 



1849. Ptebyqotus leptodactylus, M'Coy. Ann. Mag. and Nat. Hist., ser. 2, 



vol. iv, p. 394. 



1851. — — — Synops. Brit. Palaeoz. Fobs., Fasc. i, 



p. 176, pi. 1 E, figs. 7, 7a, 7b 

 (not figs. 7c, 7d). 



1853. Lbptoohkles — — Quart. Journ. Geol. Soc, vol. ix, 



p. 13. 



1859. — — Murchison. Siluria, 2nd (3rd) ed., p. 263, 538. 



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



p. 157. 

 1867. Lkptocheles (Ceeatiocaeis) lbptodactylus, Salter. In Siluria, 3rd (4th) 



ed., p. 237. 

 1867. Ceeatiocaeis leptodactyltjs, Salter. Ibid., p. 516. 

 1873. _ _ _ Catal. Camb. Sil. Foss., p. 164. 



1877. — — fi". TFoo(fM)a>-<f. Catal. Brit. Fobs. Crust., p. 71. 



1878. — MuECHisoKi (part), Suxley, Newton Sf Etheridge. Catal. 



Fobs., M. P. G., p. 84. 



1885. — LEPTODACTTLrs, T. B. Jones (J- H. Woodward. Third Eeport 



on PalsBoz. Phyllop., 

 Brit. Assoc. Sep., p. 

 339 ; Geol. Mag., dec. 

 3, vol. ii, p. 3S8. 



1886. — — — Fourth Kep., Brit. Assoc. 



Eep., p. 229; Geol. 

 Mag,, dec. 3, vol. iii, 

 p. 456. 



Some imperfect specimens (Cambridge Museum, a/923 and a/924) of the delicate 

 caudal appendages of a Ceratiocaris (PI. VI, figs. 4, 5) from Leintwardine, in 

 Shropshire,^ were referred by Prof. M'Coy at first to a chelate limb of Ptery- 

 gotus, and then to that of a different but allied genus {Leptocheles) . Ultimately 

 Mr. Salter gave them their true place in Ceratiocaris. In 1877 this species was 

 grouped with C Murchisoni in the ' Catalogue of British Fossil Crustacea,' p. 71 ; 

 and it was regarded as a variety of that species, also, in our ' Third Report on 

 Pala30zoic Phyllopoda,' 1885, pp. 336 — 339. We now find, however, that it is 

 different both as to size and proportion ; and we have detected two rows of little 



1 The very rich localities for Silurian Phyllopods in the neighbourhood of Ludlow are enumerated 

 and described in the Eev. J. D. La Touche's 'Manual of the Geology of Shropshire,' 1884, pp. 26, 27, 

 especially Ludford Lane, Bow Bridge, Leintwardine, Church Hill, and Trippleton Farm. In his 

 ' Kecord of the Eocks,' 1872, p. 124, &c., the Eev. W. S. Symonds notices Ludlow and its environs 

 from a geologist's point of view. See also ' Siluria,' 1867, chap, vii, pp. 123, et sej. 



