22 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 
abdominal appendages of the male are fully as long as in gracilis, but 
the tips are slender and styliform instead of hooked. 
Ethusa microphthalma Smith, Proc. National Mus., iii, p. 418, 1881. 
Station 921, off Martha’s Vineyard, N. lat. 40° 7/ 48”, W. long. 70° 43/ 
54”, 67 fath. (13,12); station 1047, off Delaware Bay, N. lat. 38° 31, 
W. long. 73° 21’, 156 fath. (1 ¢). The original specimen was from 
station 878, off Martha’s Vineyard, N. lat. 89° 55’, W. long. 70° 54/15”, 
142 fath. 
The female from station 921 is fully adult, but does not differ essen- 
tially from the immature female from which the species was originally 
described; in this fully adult specimen the antero-lateral angles of the 
carapax, however, project farther forward, reaching a little beyond the 
spines of the front, and the ambulatory legs are apparently propor- 
tionally longer and have proportionally slightly longer and narrower 
dactyli. 
The two males differ very remarkably from one another, and are pos- 
sibly distinct species. The one from station 921 is only slightly larger 
than the immature female (from station 878) and differs very little from 
it in the proportions of the carapax, the form of the front, or in the eyes, 
external oral appendages, or ambulatory legs, except that the first and 
second pairs are proportionally longer, with slightly longer and narrower 
dactyli. The chelipeds, however, are very unequal. The left is slender 
throughout, and like those of the female, while the right, though very 
little longer than the left, has a very stout and swollen chela. The 
right merus is much like the left, but considerably stouter; the carpus is 
much stouterthan the left, and considerably swollen; and the chelais more 
than twice as thick as the left, smooth and naked throughout, the body 
longer than the digits and much swollen, and the digits tapered to the 
tip, the prehensile edges somewhat oblique and unarmed. The male 
from station 1047, though of about the same size as the other, has a 
narrower carapax, distinctly longer than broad, but with the front abso- 
lutely broader; the ambulatory legs are considerably shorter, and with 
slightly broader dactyli; and the chelipeds are equal, and like the left 
one of the other male, except that they are very slightly shorter, and 
with proportionally slightly shorter chelz. 
