Notes on Species of Ceratiocaris. 463 



hole and a derangement of the strife in the antero-dorsal region. 

 This specimen is from the Lower-Ludlow Shale at Dudley. 



Two specimens in the Oxford Mus. L. & M. evidently belong to 

 this species. 



We wish to associate this rare but distinct species of Ceratiocaris 

 •with the name of our deceased friend, Mr. J. W. Salter, who worked 

 so long and so well on these and allied Phyllopoda. 



11. Cbratiocakis cassia, Salter. 



i860. Ceratiocaris cassia, Salter. A. M. N. H. ser. 3, vol. v. p. 159. 

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



1877. ,, „ H. Woodward. Cat. Brit. Foss. Crust, p. 70. 



1878. „ ,, Huxley and Etheridge. Cat. C. S. Foss. M. P. G. p. 141. 



The best-preserved carapace-valve (22 x 11 mm.) we have seen is 

 Brit. Mus. 44312, from the Upper Ludlow of Benson Knot ; Brit. 

 Mus. 38400, from the Lower Ludlow of Leintwardine, is also good, 

 but is crumpled so as to have its outline modified. Originally nearly 

 oblong, slightly arched above and below, truncate with hollow curve 

 behind, pointed and mucronate at the upper third in front. Ludlow 

 Mus. E. and F. and M. P. G. x 1 (Catal. C. S. Foss. 1878, p. 141), 

 seen by Mr. Salter, are not quite perfect. They are from a roadside 

 quarry S.E. of Trippleton Farm, near Leintwardine. Ludlow Mus. 

 F. and Brit. Mus. 39400 retain traces of the abdomen : in the latter, 

 15 mm. long, without appendages ; in the former much less is seen, 

 and a short telson (about 5 mm.). The carapace is horizontally 

 striate, and the telson is minutely pitted as if it had been spinose. 

 The ventral margin had a delicate raised rim. 



Ludlow Mus. H., also from Trippleton, is a very small oval relic 

 of a valve (13 x 7 mm.) possibly of C. cassia, and a loose abdomen 

 of 5-6 segments (16 mm.), with a neat little set of appendages, 

 style, 6 mm., and two stylets, each 3 mm. 



Ludlow Mus. G. may be a modified carapace of C. cassia, no 

 locality is recorded for it. 



12. Ceratiocaris, sp. nov. ? 



Mus. Pract. Geol. x -^g (Catal. C. S. Foss. 1878, p. 142), labelled 

 C. vesica, is a small specimen, having its carapace and abdomen pre- 

 served in place. From the Lower Ludlow of Leintwardine. It 

 differs very much from Physocaris vesica, although nearly of the 

 same size. The carapace is subtriangular, 25 mm. long and 15 n:»m. 

 deep at the middle of the ventral margin. The back is straight, but 

 curved clown at both ends to meet the steep upward slopes of the 

 lower margin. The abdomen (15 mm.) comes out, as usual, from the 

 upper part of the hinder region. It shows obscurely four segments 

 (the ultimate one about 6 mm.), mostly striated obliquely. The ap- 

 pendages have been broken off short. The carapace is somewhat 

 crumpled, and is roughened anteriorly, probably by the presence of 

 internal organs (such as teeth, etc.). 



It is possible that this may be a very young individual of C. stijgia, 

 to which it somewhat approximates by its subtriangular cara})ace, 

 and its obliquely -striate segments. Otherwise it must be a distinct 

 species. 



