PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 449 
the first segment of the peduncle is nearly as long as the width of the 
head; the second segment is much more slender than the first and more 
than three times as long; the third segment is more slender than the 
second and considerably longer than the first; there is a well-developed 
secondary flagellum, as long as the third segment and composed of 
-about nine slender segments; the primary flagellum is very slender 
and about one and a half times as long as the peduncle. The third 
segment of the peduncle of the antenna just reaches the distal end of 
the first segment of the peduncle of the antennula; there is a small, 
spiniform tubercle on the outside of the first segment, in line with the 
jateral spine of the head and the spiniform anterior angles of the first 
and second epimera. The distal portion of each antenna is wanting in 
the single specimen examined. 
The first gnathopods are of nearly the same form as in N. monstrosa, 
as figured by Boeck, but the inferior edge of the propodus is nearly 
straight, and the spine at the distal end is directed straight out in line 
with the edge, and not downward as in the figure of NV. monstrosa. In 
the second pair of gnathopods the carpus is about twice as long as 
broad, and has the unarmed prehensile edge much less oblique than 
represented in the figure of NV. monstrosa. The first three pairs of per- 
zeopods are very nearly as in N. monstrosa; the last two pairs are want- 
ing in the specimen. 
The pleon is. nearly as high but very much narrower than the last so- 
mites of the perzon: the first three somites are subequal in size and 
very similar in form; the fourth is as long but not quite as high as 
the third ; the fifth is not more than two-thirds as long as the fourth; 
the sixth is only about half as long as the fifth. The telson is partially 
consolidated with the sixth somite, and somewhat triangular, with an 
obtuse tip. The uropods are as in NV. monstrosa. 
Measurements. 
mm. 
Length from front of head to tip of telson..-..-.-----------------------++----- 26.0 
Length of head and peron....-..----- ------ +--+ 2+ -- 2228 eee eee eee eee eee ee eee 17.8 
Length of antennula ......-.------------ +++ 22+ 222222 eee eee eee eee eee ee nee ee ee 35. 0 
Length of first segment of peduncle.....-..-----------+-----------+-+-ee- e+e 2.4 
Length of second segment ..---.------ -----+ ---- ++ -----2 eee ee cece ee eee renee 8.2 
Length of third segment ...--...-------------+ +--+ 22-22 eee e cee nee eee ee eee 3.2 
Length of secondary flagellum.....-..--------+----+ ---+------ eee rere eee eee 3.2 
Length of carpus in first gnathopod.-...-..--..-----------+ +--+ --+----- +22 rere 3.1 
Breadehvotisameries. (ees ee oe Soe lo oc enone ween ere wne sone sniccnsicere anaes 1.8 
Length of propodus of first gnathopod...-....---------- +--+ -+---+ se2eee creer 2.5 
BereaGih Of SAMIG 22a. <a aos ce coos nce conn noe Sew enm Gaewns eaneasen sens enes esas 2.0 
Length of dactylus......---. .-2.-. ----20 eee eee een ete eee e cece ee cee e ee terres 2.7 
Length of carpus of second gnathopod..-...---- ------ -----+-++---+ ee 2222 seeeee 2.7 
ranmiiiaitnainG |) 22522 sSe.n soo e~s ns oesles sess m= seeemsr eas - <n ss caeeee ss == 1.4 
Length of propodus of second gnathopod. .-...----------- -----+---+-+---- 2-7" 2.5 
Breadth of same .....---.- oe norte Soe aeee io oc ee eee 1.8 
Tength of dactylus:...--.....--- ~---r+ s0-e--n on02 eens seen enn cere ett ene 2.0 
Proc. Nat. Mus. 80-———29 Jan. 31, 1881. 
