NO. 1573. PA RA SITIC COPE PODS— WILSON. 401 



swollen, the terminal claw slender, with an accessory spine on the 

 inner margin. The four pairs of adhesion pads all have their long 

 diameters parallel with the body axis. The fost two pairs are close 

 together, those at the base of the first antennae being elliptical and 

 half as long again as the second pair, which are broadly obovate, the 

 width and length being the same. The fourth pair are also elliptical, 

 twice as long as wide, and considerably larger than the first pair. 



Mandibles and mouth tube of the form usual in tliis genus; max- 

 illae biramose, the endopod more than twice the length of the exopod, 

 each ramus armed with a short terminal spine. 



First maxillipeds slender, the two joints about the same length, the 

 longer terminal claw strongly curved, the shorter one nearly straight. 

 Second pair much swollen, armed with a corrugated ridge having a 

 spherical knob at either end, the knobs roughened on their inner 

 surfaces and shutting together like forceps. The rami of all the 

 swimming legs are indistinctly jointed; first pair small and weak, the 

 exopod considerably longer than the endopod and bearing five spines, 

 four on the outer end and one on the inner margin ; no spines on the 

 endopod. In the exopod the basal joint is much larger than the 

 terminal, in the endopod it is much smaller; both rami are enlarged 

 at their tips. The second, third, and fourth legs increase regularly 

 in size, and particularly in the length of the rami. 



In the second pair the two joints of the exopod are equal, the basal 

 joint witli a single spine at its outer distal corner, the terminal with 

 a row of ten curved spines around its terminal and inner margins. 

 The terminal joint of the endopod is four times the size of the basal 

 and is armed with three spines, two in the position of a toe nail on 

 the inner margin and one on the outer. In the third legs the terminal 

 joints of both rami are much longer than the basal. The terminal 

 joint of the endopod has two claw spines at the inner distal corner, 

 while the entire tip of the exopod is covered with a row of spines. 



In the fourth legs the endopod is apparently one-jointed, with a 

 single spine at its inner distal corner, but in all probability it is really 

 a fusion of two joints in conformity with the other species of the 

 genus. The exopod carries a spine at the outer distal corner of the 

 basal joint and two at the inner distal corner of the terminal joint. 



Of the reproductive organs, the semen receptacle is V-shaped, the 

 point of the V being anterior, with the two sides almost entirely 

 separated from each other. Each side is short, straight, and slightly 

 enlarged at the end. The oviduct is so densely coiled in the genital 

 segment, especially in its posterior portion, as to effectually conceal 

 the cement glands. These oviduct coils are wider than those in 

 cranchii and more tightly packed. 



Total length, 9 mm.; length of carapace on mid-line, 3 mm.; 

 width of same, 3.65 mm.; length of first plates, 1 mm.; of second 

 Proc. N. M. vol. xxxiii— 07 26 



