390 NEW YORK STATE MUSEUM 
directed backward can be distinctly seen on the carapace. A faint trans- 
verse depression separates the posterior fourth from the rest of the carapace. 
Eyes. Whitfield and later Scudder [1886, p. 28] described the 
lateral eyes as situated on ridges near the antelateral borders, while Fritsch 
states that he saw three frontal eyes on the left frontal border of the eye 
lobe and therefore assumes that there may have been six altogether. He 
was the first to discern the contours of the large median eyes near the 
posterior margin. A small plain tubercle arising from a shallow depression 
is situated behind these eyes. 
The specimen itself exhibits two distinct ocelli standing out like minute 
pearls in front of the eye lobe. There are much more minute tubercles 
on the left side of the ocelli which are of a distinctly different character. 
There is further seen on the left antelateral lobe of the carapace a small 
longitudinal series of four tubercles that, from their position and character, 
may well represent another group of lateral eyes. 
Mesosoma. The mesosomatic segments forming the preabdomen have 
been the principal object of doubt. The upper side of the abdomen 
is cracked lengthwise; the left side is considered as the dorsal side, the 
right one as the ventral side by Whitfield and apparently also by Scudder. 
As a result of this conception of the fossil, it is inferred that the ventral 
side possessed, in distinction from all other | scorpions, six subequal 
sternites; and as a further corollary, that since these supposed sternites 
exhibit no stigmata, the species was probably aquatic. Thorell, Pocock 
and Fritsch have criticized these inferences, and Thorell and Fritsch agree 
that only the dorsal plates are seen, the supposed ventral plates on the 
right-hand side being only the impressions of the dorsal plates that are 
broken away. Thorell bases his view mainly on the fact that the articula- 
tions of all the ‘‘ventral plates’”’ are direct continuations of the articulations 
between the dorsal plates, which is not the case in the scorpions. The 
inspection of the specimen leaves no doubt that the ventral side of the 
preabdomen is not visible. 
Fritsch has inferred from his study of the photograph that one sees 
indications of the organs of respiration on the right side in the 4th—6th seg- 
