THE EURYPTERIDA OF NEW YORK 391 
ments. “ There are oval bodies,’’ he says, “‘which correspond to the lung 
sacs of the scorpions,” adding, ‘‘ Nothing can be observed of openings of these 
This inference is due to a deceptive 
b 
sacs, namely stigmata, to the outside.’ 
feature of the photograph, in which fragments of the test of the tergites 
and slight folds give the appearance of oval depressions in the underside 
of the preabdominal segments. 
The tergites are of relatively greater width than those of Palaeo- 
phonus, especially P. nuncius. The first is the shortest and the tergites 
gradually grow in length backward. The anterior and posterior margins 
are nearly straight, the lateral margins not well seen, owing to the crumb- 
ling of the edges. It is obvious, however, that they did not diverge for- 
ward as in Palaeophonus or were entirely rounded off as in Eoscorpius 
but diverged backward to the fourth, which is the widest, then again 
contracting. The first seems to have been rounded at the posterior angles. 
The anterior edge of the tergites possesses a transverse, forward sloping, 
smooth, articulating band which is a rather prominent feature though 
but faintly seen in the photograph. It does not, however, follow the 
lateral edges as figured by Whitfield, nor does it exhibit the raised trans- 
verse line appearing in the original figure of the species. 
Postabdomen. The first metasomatic or postabdominal segment has 
the form of a. truncate cone, as in other scorpions. Of the narrow tail 
four segments are seen in an impression only. These also have led to some 
discussion, as Whitfield, in consequence of his conception of the presence of 
ventral preabdominal plates, inferred that the impression is that of the 
ventral side of the tail. This side shows only two longitudinal ridges like 
the dorsal side in other scorpions, and hence the conclusion was reached 
that the “ bending of the tail was downward, not upward, over the back.”’ 
Against this Thorell has urged that probably the tail, which is detached, 
has been turned upside down and that now the inside of the dorsal side 
is seen in the impression. The oblique position of the frontal margin of 
the tail to the posterior margin of the first postabdominal segment, and 
the lateral position of the two carinae of the first tail segment serve to 
show that the tail is out of its original position, and that therefore no 
