Notes on Species of Ceratwcaris. 461 



ferent from those of G. papih'o. These two are rather smaller than 

 M'Coy's original C. inornata (about 50 x 20 mm.), but have the 

 same proportions, the normal height being 2i of the length ; whilst 

 C. papilio is larger and has less height in proportion, the length 

 being only twice the height, or even less. 



6. Ceeatiocakis Oretonensis, H. Woodward. 

 1871. Ceratiocaris Oretonensis, H. Woodward. Geol. Mag. Vol. VIII. p. 105, 



PI. III. Fig. I. 

 1878. ,, ,, H. Woodward. Cat. Brit. Foss. Crust, p. 71. 



This Carboniferous species, described in the Geol. Mag. for March, 

 1871, approaches closely to some of the forms of Ceratiocaris found 

 in the Upper Silurian of Benson Knot — namely, C. inornata, M'Coy. 

 The carapace (50 x 22 mm.) is larger, however, without attaining 

 the size and proportions of C. papilio, which is also found there, and 

 is not without an apparent relationship to the former, as already 

 noticed (p. 394). In again examining the specimens, we find that 

 the anterior end is not so much rounded as in Fig. 1, but is slightly 

 and obliquely truncate ; and the antero-ventral margin more sloping 

 and less convex ; thus the greatest depth of the carapace is in the 

 hinder half. Four specimens from the Yellow Carboniferous Lime- 

 stone of Oreton and Farlow, Worcestershire, not well preserved. 

 The indistinct ' eye-spot,' mentioned at p. 105, is very problematical, 

 and may have been caused by pressure on some internal organ 

 (teeth?). 



7. Ceeatiocakis truncata, H. Woodward. 



1871. Ceratiocaris truncatus, H. Woodward. Geol. Mag. Vol. VIII. p. 106. 



PI. III. Fig. 2. 

 1878. ,, ,, H. Woodward. Cat. Brit. Foss. Crust, p. 72. 



The smaller species occurring with the last (G. Oretonensis) was 

 described and figured with it in 1871. The carapace (35 X 15 mm.) 

 is well figured, except 4hat (as the author remarks, p. 106) the 

 slightly concave truncation of the hinder end is not well rendered by 

 the artist. Its smaller size, sharp antero-dorsal angle, and nearly 

 even ventral curve, distinguish it from its associates, but scarcely 

 separate it as far as the outline is concerned from some specimens of 

 C. inornata at Benson Knot. 



8. Ceratiocaris solenoides, M'Coy. 

 1849. Ceratiocaris solenoides, M'Coy. Ann. Mag. N. H. ser. 2, vol. iv. p. 413, 



with woodcut. 

 1851. ,, ,, M'Coy. Brit. Palseoz. Foss. fasc. i. p. 138, pi. i E. 



figs. 5, 5a. 

 1854. ,, ,, Morris. Catal. Brit. Foss. 2nd ed. p. 173. 



i860. Cultelhcs? ( Ceratiosolcn ? ) rectus, Salter. Ann. Mag. N. H. ser. 3, vol. v. 



p. 160. 

 1873. Ceratiocaris solenoides, Salter. Cat. Camb. Sil. Foss. p. 178. 

 1877. ,, ,, H. Woodward. Catal. Brit. Foss. p. 178. 



Prof. M'Coy founded the genus on this species and C. elliptica in 1849. 



The original specimens in the Cambridge Mus. (?)/40, &/41) are not 

 exactly drawn in M'Coy's figs. 5 and 5a. The carapace is elongate, 

 sub-cylindrical, slightly convex on the sides, with an even elliptical 

 anterior curve, and an oblique truncation posteriorly. There are 



