648 PROCEEDINGS OF THE NATIONAL MUSEUM. 



made the type of the new species; the other specimen is numbered 

 43583 and becomes a paratype. 



Specific characters of female. — Cephalo thorax thick, cylindrical, 

 longer than the trunk, and in line with the second maxillae at right 

 angles to the trunk axis; head not enlarged and without a dorsal 

 carapace; trunk ovoid, flattened dorso-ventrally, contracted ante- 

 riorly where it joins the cephalo thorax, and smoothly rounded pos- 

 teriorly; a single pair of posterior appendages dorsal to the egg strings, 

 close together, parallel, and curved dorsally; no genital process, abdo- 

 men, or anal laminae; egg strings attached dorsally ciose to the 

 processes, as long as the trunk and half as thick; eggs small, in 8 or 

 10 longitudmal rows, about 30 in a row. 



First antennae very rudimentary, a mere unsegmented knob inside 

 the second pair; second antennae indistmctly three-jointed and bira- 

 mose at the tip, the two rami hke the jaws of a pair of pincers, and 

 each tipped with a minute spine; basal joint much enlarged, with a 

 wide flattened and laminate process on the posterior murgin. The 

 area carrying the mouth tube is depressed or telescoped into the 

 anterior part of the head, so that the mouth does not project beyond 

 the surface. In this depression lie the first antennae and the first 

 maxiHae. The second maxillae are separate at their base and for 

 one quarter of their length, then fused sohdly. At the base of each 

 maxilla, on the lateral margin where it joins the cephalo thorax, is a 

 maxillary gland, trapezoidal in outline, as wide as the maxilla, and 

 projecting prominently. These glands are pecuharly large and their 

 location is a conspicuous one. At the tips of these maxillae we do 

 not find a bulla, but a pair of dichotomously branched horns. Each 

 of these starts from the lateral margin of the maxiUa on its own side, 

 and the two extend away from each other; they are twice or thrice 

 compounded and the branches are bluntly pointed. The maxiUipeds 

 are situated at the center of the space between the second maxillae 

 and the mouth tube; their basal jomts are minute, slender, and 

 triangular in shape, while the terminal claws have degenerated into 

 mere spines at the apex of the basal joints. 



Color (preserved material), a dark yeUo wish-brown. 



Length of cephalothorax, 5 mm.; of trunk, 4.75 mm.; of posterior 

 processes, 4 mm.; of egg strings, 4.25 mm. Width of cephalothorax, 

 1.40 mm.; of trunk, 2.5 mm. 



(corniger, carrying or wearing a horn, alluding to the second 

 maxillae.) 



RemarTcs. — Phis being the only species of the genus, it follows that 

 it displays all the generic characters, and so becomes of great sys- 

 tematic interest. The remarks already made imder the genus apply 

 with equal force here. 



