I42 NEW YORK STATE MUSEUM 
acteristic features of their order. Recently a fossil Thelyphonus from 
the Bohemian Carbonic, Prothelyphonus bohemicus (Kusta), 
has been fully made known by Fritsch [1904]. Unfortunately the speci- 
men shows the ventral aspect only, more or less involved with the 
dorsal side. But if we read the figures 5, 6 and 7 of his plate 6 aright, the 
ventral segments in Carbonic time still possessed a like development with 
the dorsal ones and the agreement of the Pedipalpi with the eurypterids 
in the greater development of the 
genital plate would have mani- 
fested itself only after the disap- 
uy 
NM 
~ 
~ 
pearance of the eurypterids and so 
/ 
U 
lack phylogenetic significance. 
Some very significant points 
regarding the relationship of the 
eurypterids and scorpions have 
been brought out by Pocock’s in- 
vestigations [1901] of the Scottish 
Siluric scorpion, Palaeophonus 
a hunteri. We briefly note the 
more important of these. Pocock 
Figure 28 B, fourth leg of a recent scorpion points out that the walking legs 
(Buthus australis); C, third leg of Siluric of Palaeophonus differ from those 
scorpion (Palaeophonus nuncius). (From — 
Pocock) of all other scorpions, living or 
fossil, in their primitive character [text fig. 28]. They consist of the primi- 
tive number of segments (seven), show the simplicity of segmentation by the 
subequality of the individual segments and possess a sharply pointed, 
practically clawless terminal segment, strikingly resembling those of some 
eurypterids (Pterygotus) and differing greatly from those of the recent 
scorpions. Further, in distinction from the later scorpions, the basal 
or coxal segments of all the appendages were in contact or capable 
of meeting in the middle line, although the coxae of the fourth were small 
.and functionless [text fig. 85]. In this feature the archaic Palaeophonus 
