584 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvm. 



joint, very stout, and furnished with a short accessor}' spine on the 

 ventral surface (tig'. 130). 



This claw is operated by powerful muscles contained in the basal 

 joint and it must make an effective prehensile organ. 



Furca long and narrow, the base longer than the branches, the latter 

 of a broad U -shape with the sides nearly parallel. 



The first thoracic legs are so small and weak as to appear shriveled; 

 this is especially noticeable in the plumose seta? along the posterior 

 margin of the terminal joint, which are scarcely longer than the diam- 

 eter of the joint. In the alcoholic specimen taken from the menhaden 

 the two posterior of the three terminal claws are branched, the 

 branches being straight, longer than the tips of the claws, and 

 inserted nearly at right angles to the axis of the claw (tig. 133). In 

 the living specimens obtained by the author from the sword-fish the 

 claws are mostly unbranched, but are of the same relative size as in 

 the menhaden specimen. 



In all the specimens the appendage at the inner corner of the joint 

 is a long, strongly curved claw instead of a plumose seta. 



This is similar to the condition in schistonyx, but the relative size of 

 the claws and the seta is entirely different in the two species. The 

 second legs are large, of normal structure, and armed with long acumi- 

 nate spines. The rami of the third legs are well separated, the claw 

 on the basal joint of the exopod is large and slightly curved, while 

 the endopod is one-jointed. 



The fourth legs are three-jointed, long and slender, the basal joint 

 as long as the other two. This leg carries five spines, one at the 

 distal end of the second joint, one on the outer margin of the terminal 

 joint and three at the end. 



Of the latter the inner one is about twice as long as the outer. 



The fifth legs are not visible dorsally. 



Total length in menhaden specimen 5 mm. Length of carapace 2.5 

 mm. ; width of same 2.1 mm. ; length of genital segment 1 mm. ; length 

 of abdomen 1.1 mm. 



Total length of swordfish specimens 6-6.5 mm. Length of carapace 

 3 mm.; width of same 2.3 mm.; length of genital segment 1.6 mm.; 

 length of abdomen 1.45 mm.; length of egg strings 3.2 mm.; 45 or 50 

 eggs in each. 



Color a transparent yellow, very thickly spotted on both the dorsal 

 and ventral surfaces with branching pigment dots of a rusty brown. 

 These spots are quite similar to those on C. rapax in shape and 

 arrangement, but the resultant color is a sober gray brown quite 

 different from the bright red tint of rapax. In fact, there is enough 

 difference in the color alone to distinguish the two species when taken 

 together on the swordfish. 



