428 PROCEEDING OF THE NATIONAL MUSEUM. vol. 59. 



separated by narrow sinuses. The genital segment is shorl and 

 wide, the width to the length in the proportion of 3 to 2. 



The abdomen is three-jointed, the joints about the same length, 

 but diminishing in width backward. The anal laminae are oblong, 

 square-cornered, and convergent; each is armed with two setae, the 

 inner of which is twice as long as the outer. The egg strings are 

 attached to the sides of the genital segment,, are about the same 

 width as the latter, are three times as long as wide, and are slightly 

 curved. The eggs are large and spherical, 25 or 30 in each string. 



The first antennae are seven-jointed, the second joint the longest, 

 the fourth the shortest, and all the joints heavily armed with setae. 

 These antennae are attached to the ventral surface of the head, and 

 in preserved specimens are turned inward and backward along the 

 ventral surface of the carapace so as to be invisible in dorsal view. 



The second antennae are three-jointed; the basal joint carries a 

 long seta at its distal anterior corner; the terminal joint has a row 

 of four long setae across the tip and one on the dorsal surface near 

 the outer margin. The first maxillae are somewhat like those of 

 Ergasilus, consisting of a short process armed with four setae. The 

 second maxillae are biramose; the endopod is made up of a stout 

 spine, bipartite at the tip, the inner branch longer than the outer; to 

 the outer margin at about the center and to the ventral surface near 

 the base are attached slender plumose setae, one in each place. The 

 exopod consists of a stout plumose seta bearing on its inner margin 

 near the base a secondary slender seta, the two being the same length 

 as the endopod spine. The maxillipeds are made up of four joints, 

 two longer basal joints and two shorter terminal ones. Each of the 

 former carries two plumose setae on its inner margin at the center; 

 the terminal joint is tipped with a tuft of plumose setae while the 

 penultimate joint carries a single seta on its outer margin. 



In the peculiarly modified first legs the large flattened spine or 

 plate on the inner margin of the endopod is short and blunt, quite 

 different from the slender, acuminate-pointed plate of apodiforme. 

 The spine at the inner margin of the second joint is foot-shaped, with 

 a bluntly rounded toe; the spine at the base of the process on the third 

 joint is stout and bluntly pointed. The process itself is wide, longer 

 than the spines and tipped with a claw; it is armed with three sucking 

 disks. The exopod is three-jointed; the two basal joints each have a 

 single spine on the outer margin, while the terminal joint has two on 

 the outer margin and two at the tip, of which the inner one is con- 

 siderably the longer. The second, third, and fourth legs are similar 

 to those of apodiforme, with slight differences. In the fifth legs 

 there are three spines at the tip, of which the central one is the longest 

 and a fourth on the outer margin near the center. 



Total length, 1.40 mm. Width of cephalothorax, 1 mm. Length 

 of egg strings, 0.40 mm. 



