NEW SPECIES OF FOSSIL SCORPIONS. 399 
the carapace have been pushed aside by the fossil being crushed obliquely, 
smaller eyes are seen at the antero-lateral angles. In one case three were 
observed on one side, though it is probable that there was at least one more 
still hidden. From the specimens at command the exact number cannot be 
made out. The character of the test of the carapace is horny, and where 
swollen up it is thicker than at other parts, and dotted over with larger and 
smaller tubercles in an irregular manner. The floor of the sulcus and the 
eminence bearing the mesial eyes are smooth, while the triangular areas at the 
posterior angles are thin and wrinkled. 
Appendages of Cephalothorax.—Falces unknown. Palpi chelate, short, and 
comparatively stout. Walking limbs unknown, with the exception of the cox 
of four of the limbs on one side, which are preserved as triangular flattened 
plates converging in front of the segment bearing the comb organs. 
Abdomen.—Six segments only are preserved. The dorsal plates of those in 
front are short, each succeeding segment gradually becoming deeper, so that the 
sixth is three times the depth of the first. All seem to be about equally broad. 
They all have a broad thickened smooth articular margin in front, the parts 
left uncovered being dotted all over with smaller tubercles, and the posterior 
margin slightly fimbriated and set with two rows of larger tubercles. Their 
lateral margins are rounded. The ventral plates of only the first four seg- 
ments are preserved. Nothing can be said of the first two, except that one of 
them bears the combs. The third is an apron-like flap, narrow in front and 
widening posteriorly, and rounded at the angles. It is as deep as three of the 
dorsal plates opposite which it is placed. Within the rounded postero-lateral 
angles of this plate two fine slits occur which are the openings into the air 
sacs. The fourth is too much crushed for description. These plates are united 
by their lateral margins to the dorsal portions by longitudinally folded thinner 
skin, which is constricted opposite the articulations. 
Abdominal Appendages.—The combs are large in proportion to the animal. 
In the best specimen they are well preserved, though they are folded back upon 
themselves, so as only to show their form near the tips. They seem to be made 
up of a broad triangular rachis ornamented with an irregular embossed scale- 
like pattern, which reminds one of that on Hurypterus and Piterygotus, and 
edged at the lower side with a row of comparatively large leaf-like teeth. These 
are constricted at their bases, they then suddenly expand, the sides then 
become parallel, and as suddenly become truncated to a blunt point. Being 
nearly all of a length when seen together, their upper and lower edges form 
nearly parallel lines. In their present crushed state the individual leaflets 
overlap each other like the splints of a venetian blind. 
Tail and Poison Gland unknown. 
The above characters have been ascertained from the study of several 
