346 REPORT—1885. 
Cambridge Museum has its carapace ovate-oblong or somewhat boa’ 
shaped in outline, 50 mm. (2 inches) long, height 18 mm.; moderately 
convex ; straight or very slightly arched above and more strongly arched — 
below (both edges are partly imbedded in the matrix of the original — 
specimen, 6/5, 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 the ~ 
ostero-dorsal angle distinct, and the postero-ventral angle prominent 
and blunt. Thereis no eye-spot. Traces of longitudinal striz are visible 
on the impressions of the valves in the grey, micaceous, Upper-Ludlow 
sandstone, from Benson Knot, near Kendal, Westmoreland; two spe- 
cimens (one of them good) are in the British Museum, No. ‘ 44342,’ from 
the same locality. 
The foregoing description does not quite tally with the account of the 
species in the ‘ Brit. Pal. Foss.’ p. 137, nor with that in the ‘ Ann. Mag. 
N. H.’ /.¢., but is based on the original specimen and not on the restored 
figure in the ‘ Brit. Pal. Foss.’ The figure annexed by Mr. Salter to his 
note on C. inornata in the ‘ Catal. Camb. Sil. Foss.’ 1873, p. 178, is used 
also in connection with two other species at p. 16 and p.164. In the 
latter case it is probably intended for ‘ C. leptodactylus,’ which we recog- — 
nise as C. Murchisoni. 
C. inornata approaches C. papilio in form in some cases, but we think — 
that they are quite distinct species. There are some small carapaces, one 
from Lesmahago, B. M. ‘ 59648,’ very near to C. papilio in form, and mea- 
suring 34x13 mm., and one from Benson Knot, B. M. ‘ 44342,’ measur- 
ing 35 x 14mm. These proportions are different from those of O. papilio. — 
These two are rather smaller than M‘Coy’s original OC. inornata (about — 
50 x 20 mm.), but have the same proportions, the normal height being — 
24 of the length; whilst C. papilio is larger and has less height in pro-— 
portion, the length being only twice the height, or even less. 3 
6. Ceratiocaris ORETONENSIS, H. Woodward. 
1871. Ceratiocaris Oretonensis, H. Woodward. ‘Geol. Mag.’ vol. viii. p. 105, pl. 3, 
fig. 1. 
1878. Ceratiocaris Oretonensis, 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 cara- ~ 
pace (50 x 22 mm.) is larger, however, without attaining the size and | 
proportions of OC. papilio, which is also found there, and is not without — 
an apparent relationship to the former, as noticed above. 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 is more sloping and less convex; thus the greatest 
depth of the carapace is in the hinder half. Four specimens from the 
Yellow Carboniferous Limestone of Oreton and Farlow, Worcestershire, q 
not well preserved. The indistinct, ‘ eye-spot,’ mentioned ‘ab p. 105, is very 
problematical, and may have been caused by pressure on some ‘internal 
organ (teeth P). 
7. CERATIOCARIS TRUNCATA, H. Woodward. 
1871. Ceratiocaris truncatus, H. Woodward. ‘ Geol. Mag.’ vol. viii. p. 106, pl. 3, figs 2, 
1878. Ceratiocaris truncatus, H. Woodward. ‘Cat. Brit. ~ Foss. Crust.’ p. 72. 
il 
