CERATIOCARIS PAPILIO. 35 



10. Cbratiooabis PAPILIO,' Salter, 1860. PI. XI, figs. 4 a, 4 6, 6; PL XII, fig. 1. 



1859. Ceeatiocaeis, Salter. In Murchiaou's Siluria, 2iid (3rd) edit., p. 262, 



woodcut, fig. 1, p. 638. 



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



p. 154, woodcut, fig. 1, and p. 155. 

 1865. — — Salter and H. Woodward. Catal. and Chart Fosa. 



Crust., p. 17 (not fig. 6). 

 1865. — — S. Woodward. Q-eol. Mag., vol. ii, p. 403, pi. 11, 



figs. 1 and 2. 

 1865. — — m^U. Catal. Foss. M. P. G., p. 79. 



1867. — — Salter. In Siluria, 3rd (4th) edit., p. 236, 



woodcut, fig. 1 (not fig. 2), and 

 p. 516. 

 1873. — — — Catal. Camb. and SiLWoodw. Fobs., p. 178. 



1873. — — R. Etheridge, jun. Mem. Gaol. Surv. Scotl. 



Bxpl. Map 23, pp. 55, B6. 



1876. — — Armstrong and others. Catal. "W.-Scot. Fossils, 



p. 24. 



1877. — — H. Woodward. Catal. Brit. Foss. Crust., p. 71. 



1878. — — Huxley, Newton, and Etheridge. Catal. Camb. and 



8il. Foss., p. 142. 



1885. — — T. B. J. Sf H. W. Third Eeport Pal. Phyll., 



p. 341; Geol. Mag., 1885, 

 p. 392, pi. 10, fig. 1. 



1886. — — — Fourth Eeport, p. 231 ; 



Geol. Mag., 1886, p. 458. 



We have not yet by any means exhausted the study of G. papilio and stygia. 

 "We know, however, that the abdominal segments in both were dehcately sculptured 

 with leaf -like or lattice-pattern ornament, as in some other species, the points of the 

 triangles pointing upwards, or rather backwards, towards the carapace, and one 

 limb of the triangle, where free, running downwards and outwards in the other 

 direction. These oblique lines are often visible when the triangles have disap- 

 peared from wear or decomposition. Among many others the segments M. P. G. 

 X -fV ; B. M. 41900 : Oxford Mus. A and H exhibit fine examples of this leaf-like 

 ornament ; and it is visible in several more complete individuals in those collec- 

 tions. In the Braidwood, Glasgow, and Edinburgh Museums numerous specimens 

 (chiefly G. stygia) show it well. 



Of the two species, so abundant in the Lower Ludlow Shales of Logan 



1 Of tins species and C stygia we have more material at our command than we have been as yet 

 able to figure and fully describe. We rest content at present with PI. XII and the few other figures, 

 intending to give illustrations and detailed descriptions of other and better specimens further on. 



