THE EURYPTERIDA OF NEW YORK 319 
jects twice as far beyond the carapace with five segments exposed and these 
segments are, as in the preceding limb, of subequal length (except the fifth 
which is a little longer and the seventh which is much shorter) though 
greatly differing in width, the fourth being more than twice as wide as the 
last. The second and third segments can also be seen faintly outlined in 
specimen, plate 56. - They are only about half as long as the following, but | 
wider; the third is still much shorter than the second, as in other euryp- 
terids, and forms a narrow ring. The undersides of the segments are 
furnished with two slender spines each. The next, last limb, is again almost 
twice as long as the fourth in its exposed portion and the slight differences 
in the lengths of the segments observed in the preceding legs are here 
greatly exaggerated, the second and third segments being narrow rings, 
while the fourth segment is greatly lengthened and the fifth again longer 
by one third. The next two segments (sixth and seventh) are each as long 
as the fourth, and the eighth is reduced to nearly half that length. The 
segments of this limb are not furnished with spines on the underside. 
The coxa of this limb is also outlined on plate 56. It is relatively 
small, its length amounting to not more than one third of the carapace; 
distinctly trapezoidal in outline, width and length are subequal, its anterior 
margin gently convex and larger by one fourth than the posterior. The 
manducatory edge was apparently short. The terminal claw of the last 
limb is as long as the last segment and curved inward. 
The metastoma has not been seen. | | 
Genital appendages. ®pecimen plate 56 shows a long elliptic impres- 
sion, extending over the operculum and first sternite and suggesting a 
female opercular appendage; and the young specimen on plate 25, figure 3, 
exhibits a short oval plate in the median line of the operculum. 
Ornamentation. The surface sculpture shows a transverse row of 
sharply angular scales along the posterior margins of the segments on 
the upperside. Some of these along the median line of the post- 
abdomen grew into distinct short spines. The remainder of the surface 
is covered with what look like smaller, more irregular, similar scales, 
