2 
ON THE FOSSIL PHYLLOPODA OF THE PALZOZOIC ROCKS. 349 
12. Crratiocaris, sp. nov, ? 
Mus. Pract. Geol. x s'; (‘ Catal. C. S. Foss.’ 1878, p. 142), labelled 
“C. vesica,’ is asmall specimen, having its carapace and abdomen preserved 
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 mm. deep at the middle of the 
yentral margin. The back is straight, but curved down 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 appendages have been broken off short. The carapace 
is somewhat crumpled, and is roughened anteriorly, probably by the 
presence of internal organs (such as teeth, &c.). 
It is possible that this may be a very young individual of C. stygia, to 
which it somewhat approximates by its subtriangular carapace, and its 
obliquely-striate segments. Otherwise it must be a distinct species. 
Specimen Ind. Mus. J. (from Trippleton, near Leintwardine) has a 
smaller but nearly similar carapace (22x12 mm.); nearly straight on 
the back, deeply curved below, and with almost equal dorsal angles in 
front and behind, but sharp instead of being blunt. 
13. CERATIOCARIS ROBUSTA, Salter. 
1851. Pterygotus leptodactylus, M‘Coy (in part). ‘ Brit. Palsoz. Foss.’ fasc. i. p- 175, 
1. 1 E, figs. 7c, 7d. 
1860. Ceratiocaris robustus, Salter. * Ann. Mag. N. H.’ ser. 3, vol. v. p. 158. 
: 1867. by ee te In ‘Siluria,’ 3rd (4th) edit. p. 516. 
1873, 53 .< = ‘Cat. Camb. Sil. Foss.’ p. 164. 
1877. ay 8 H. Woodward. ‘Cat. Brit. Foss. Crust,’ Dele 
1878. = » Huxley and Etheridge. ‘Cat. Camb. Sil. Foss. M. P. G.’ 
5 p. 142. 
This species was founded on the caudal appendages of a species the 
carapace of which has not yet been collated. The original specimens 
figured by M‘Coy and referred by Salter to a new species are in the Cam- 
bridge University Museum (a/925, fig. 7c; a/926, fig. 7d). The telson, 
32 mm. long (longer than the figure), is straight, broadly ensiform, 6 mm. 
broad at its base. The stylets, 20 mm. long, are also relatively broad 
and ensiform or sharp-blade-like. They all seem to have once been faintly 
a and ridged or costulated. They were from Leintwardine (Lower 
sadlow). 
BF  tinsilar specimens, collected by the late Mr. Lightbody in Upper- 
Indlow beds, ‘ above Ashley Moor,’ are in the Owens College Museum, 
Manchester. One of the sets, however, has the stylets nearly as long as 
the style: whether this was due to variation of growth or to accident, we 
cannot now decide. 
_ B. M. ‘39404,’ from Leintwardine, belongs to the same species, though 
the style is rather longer (35 mm.). 
Also M. P. G. 4, (‘ Catal.’ 1878, p. 142), from Leintwardine, seems to 
belong to this form. It shows two segments and appendages. Style, 
40 mm.; one stylet present, broad and ensiform, 25 mm. long. 
__. Specimen A, Oxford Mus. (Grindrod Coll.) consists of the penultimate 
(11 mm.), and ultimate (20 mm.) segments, with a broad style (45 mm.) 
and corresponding smaller stylet (25mm.), of what seemsto bearather large 
C. robusta. The caudal spines are strong, broad, and ensiform, the style 
