THE EURYPTERIDA OF NEW YORK 153 
sidered as indicative of a new genus and it is proposed to recognize this 
type under the name Strabops nov. gen., with Strabops thacheri 
n. sp. as the type species. The generic name is in allusion to the inward 
turning or squinting of the eyes. 
Two of the differential characters here cited, viz, the anterior position 
of the eyes and the absence of one somite, are not verified by the counter- 
part. The supposed eyes, which were 
represented as oblique ovate cavities with 
the visual surfaces apparently broken out 
[see original figure, copied here in text 
fig. 31], are small lumps of the underlying 
rock held in place by the overlapping fold 
which has formed near the frontal mar- 
gin by a shoving ‘of the specimen. These 
have been. chiseled out on the counterpart 
and the surface of the folded part of the 
carapace exposed. The real eyes are seen 
in our specimen half way between the 
anterior and posterior edges, near the 
lateral margin. They are small and 
circular. 
The other difference concerns the 
number of abdominal somites on the 
dorsal side, for the intaglio and the 
plaster cast therefrom seem to leave no 
doubt that Strabops agreed -with the 
later eurypterids in having 12 segments. ‘pigure 31 Strabops thacheri 
The rst segment is for the greater part Beecher. Outline of original drawing 
pushed under the carapace, and the next, the 1st in Beecher’s figure, is 
shown only on the right side of the bent specimen; on the other side the 
bending of the abdomen has. forced it back over the 3d tergite. 
With these corrections of structure, Strabops stands still closer to the 
Siluric Eurypterus than it appeared to Beecher; in fact it is obvious that 
all the principal parts of eurypterid structure are already fully fixed in 
