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MR B. N. PEACH ON SOME 
the Lower Carboniferous Rocks of Mazon Creek, Morris Grundy County, Illinois, U.S.A., in 
the “ American Journal of Science and Art,” 2d ser. vol. xlv. p. 25, and also in the ‘‘ Memoirs 
of the Geological Survey of Ilinois and Iowa,” vol. iii. p. 560. They also describe a speci- 
men which they consider to belong to the Pseudo-scorpions, and call it Mazonia Woodiana, 
from the locality whence it was derived, Mazon Creek (cbid. p. 563) 
In 1873 Henry Woopwarp, Esq., F.R.S., read a paper before the Geological Society of London on 
remains of fossil scorpions from the Coal-measures of England and a doubtful tail segment 
from the Carboniferous Limestone series of Carluke, Scotland, which he refers to the genus 
Eoscorpius, Meek and Worthen, and ranks under one species Koscorpius Anglicus (Quart. 
Journal of the Geolog. Soc., vol. xxxil. p. 57). 
In 1881 a newspaper notice of a meeting of the Geological Society of Glasgow records the exhibi- 
tion of a tail segment of Hoscorpius by Mr Courts from the Carboniferous Limestone Rocks of 
East Kilbride, Scotland. 
DESCRIPTION. 
Genus Hoscorpius, Meek and Worthen, 1868.* 
Eoscorpius tuberculatus, n. sp. (Plate XXIII. figs. 8 to 8). 
The characters of this species are made out from several fragmentary speci- 
mens obtained from the valley of the Forth. These all show it to have been 
small. One specimen exhibits the carapace and six of the segments of the 
abdomen. If the rest of the body bore the same proportions to this as obtains 
in the present Scorpio afer, the whole animal ought to be about 23 inches long 
from the anterior margin of the carapace to the point of the tail sting. 
Cephalothorax.—The carapace is subquadrate with rounded off angles, and 
narrower in front than behind. It is produced into a slight peak anteriorly in 
the middle line. The posterior margin is concave, and bordered by a broad 
band which is slightly peaked backwards in the middle. A deep depression 
divides the carapace into right and left halves. On each side of it the test is 
raised into swollen cheek-like lobes which occupy the whole breadth at 
the anterior and antero-lateral margins, which they overhang and entirely 
hide when the carapace is viewed from above. From this they taper backwards 
to blunt points on each side of the depression near the posterior margin. 
Exterior to these are two less raised triangular areas which occupy the remain- 
ing portions of the carapace. Towards the anterior end of the mesial furrow 
rises a comparatively large pyriform eminence with its narrow end directed 
backwards, the broader portion being set with two large circular or slightly oval 
simple eyes placed so as to look upwards, forwards, and slightly outwards. The 
eminence is composed of two connate tubes which rise at an angle of about 20° 
from the plane of the sulcus in which they are set, and diverge outwards at an 
angle of from 30° to 40°. The corneas of the eyes appear like “ bull’s eyes” at 
the mouths of the tubes. In cases where the overlapping cheek-like lobes of 
* « American Journ. Science and Arts,” 2d ser., vol. xlv. p. 25. 
