48 BRITISH PALAEOZOIC PHYLLOCARIDA. 



Ludlow beds at Leintwardine, is a somewhat similar little set of appendages (three 

 spines), but broken off at the top. What remains of the longest middle one, is 

 8 mm., of the two lateral stylets 6 mm. (PI. XI, fig. 10.) 



These may represent a very young condition of some of the foregoing species ; 

 but they probably belong to a distinct species. 



17. Ceratiocahis inornata, M'Coy, 1851. PI. X, figs. 2, 3, 5. 



1851. Cebatiocaris inoenatus (Salter MS.), M'Coy. Brit. Pal. Foss., p. 137, 



pi. IE, fig. 4. 

 1854. Morris. Catal. Brit. Foss., 2nd edit., p. 102. 



1859. - — Salter. In Siluria, 2nd (3rd), edit., p. 532. 



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



p. 156. 

 1865. H. Sf E. Catal. Foss. M. P. G., p. 79. 



1867. — — Salter. In Siluria, 3rd (4th) edit., p. 516. 



1873. — — — Catal. Cainb. Sil. Foss., pp. 177, 178. 



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



1885. — tnoenata, T. B. J. Sf R. W. Third Report Pal. Phyll., 



pp. 345, 340 ; Geol. Mag., 

 1885, p. 460. 



1886. — Fourth Report, p. 232 ; Geol. 



Mag., 1886, p. 459. 



This is the third of M'Coy's original species of the genus Ceratiocaris. The 

 specimen (PI. X, fig. 3) b/5, in the Cambridge Museum, from Benson Knot, has its 

 carapace ovate-oblong or somewhat boat-shaped in outline, 50 mm. (2 inches) long, 

 height 18 mm. ; moderately convex ; straight above and arched below (both 

 edges are partly embedded in the matrix of the original specimen, b/b, 

 M'Coy's fig. 4). The anterior end (damaged) was neatly rounded, sloping up 

 gracefully from below ; the posterior is obliquely truncate from above downwards 

 and outwards, with a slight ogee curve at the top ; the postero-dorsal angle distinct, 

 and the postero-ventral angle prominent but blunt. There is no eye-spot. Traces 

 of delicate, parallel, longitudinal striae are visible on the impressions of the valves 

 in the grey stone, strongest on the middle and ventral regions. Two specimens 

 (one of them good, PI. X, fig. 2) are in the British Museum, No. 44342, from the 

 same locality. Sometimes the valves have been wrinkled longitudinally and 

 irregularly by pressure, showing that they were thin and toughish (PI. X, figs. 

 3 and 5). 



The foregoing description does not quite tally with the account of the species 



