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outer spines, between which above there are two delicate, 
feathered sete. In A. acanthitelsonis the telson is “‘ armed 
with about forty strong articulating spines, twenty on each side, 
and terminating in two smaller ones at the extremity (Chal- 
lenger Macrura, p. 745). 
The eyes are short, tolerably broad. They are not in good 
condition, but show the peculiar character which Bate figures 
in A. angusta and A. stca, and with variations in some other 
species. Faxon speaks of this as “‘an oblong black ‘ ocellus’ 
barely connected with the eye, on the dorsal surface of the 
ocular peduncle,”’ occurring in some specimens of A. agassiztt 
(Mem. Mus. Comp. Zodl., p. 161, 1895). There is a small blunt 
projection distally on the inner margin of the peduncle. 
The first and second antennae agree with Bate’s generic 
description and with the figures he gives of A. stca. 
The first maxillipeds also agree with Bate’s figure as regards 
the smooth bifid epipod, the much curved, broad, setose 
exopod; but the endopod has a setose terminal (fourth) 
joint, which Bate does not indicate. Concerning the third 
maxillipeds Bate says, ‘‘ The coxa supports externally a lunate 
calcified plate that articulates with a rudimentary mastigo- 
branchia, that is independent of any branchial plume; while 
next it a plume is attached to the membranous articulation.” 
He figures this appendage for A. sca, and in his description 
says, ‘‘ The coxa carries a lunate disc-like plate, of which the 
upper horn is bifid.”” In our species the little horn is just 
above the articulation of the epipod instead of at the opposite 
end of the lunate plate as shown for A. sica. It confronts a 
little raised point. 
The first peraeopods are stouter and shorter than the second, 
and have a close-set comb of short spines on the palm of the 
hand, and the third and fourth joints furnished with a thick 
fringe of short feathered sete at right angles to the margin. 
The plate that bears the epipod is not lunate and has the 
accessory horn and confronting point somewhat concealed ; 
at its outer extremity there is a blunt process carrying a 
bunch of very long flexible and distally biserrate sete. 
The second peraeopods have but few setae on the slender 
palm, the third and fourth joints armed as in the first pair, 
and the epipod of similar structure. 
The last three peraeopods are supplied on both margins 
with long feathered sete; the third and fourth pairs having 
also strong spines along the third and fourth joints, the fingers 
straight and thickly set with short spines along both margins. 
The fifth pair have a comb of short spines along the distal 
