584 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 55. 



are two minute papillae, all that is left of the chela. Dorsal to the 

 bases of these antennae is a pair of small knobs which represent the 

 first antennae; ventral to them is the mouth opening, which does 

 not show any maxillae. 



Color (preserved material), yellowish gray tinged with brown on 

 the neck and genital segment. 



Total length, excluding the posterior processes, 32 mm. Cephalo- 

 thorax, 3 mm, long, 1.66 mm. wide. Neck, 1.66 mm. in diameter. 

 Trunk, 15 mm. long, 10 mm. wide at the posterior end. Posterior 

 processes, 20 mm. long, 15 mm. wide. 



Specific characters of male. — The anterior end of the head is cut 

 at an angle of 45° with the body axis, and on the flattened disk thus 

 produced are the two pairs of antennae, the mouth tube, and the 

 first maxillae. 



The antennae are attached about two-fifths of the distance from 

 the lateral margin to the center of the disk, the anterior pair 

 slightly nearer together than the posterior, both pairs projecting 

 at right angles to the surface of the disk. Each anterior antenna is 

 three- jointed, the basal joint as long as the other two, three times as 

 wide, and flattened laterally, carrying on its inner surface a long 

 slender seta. Each posterior antenna is four-jointed, the second 

 and fourth joints about the same length, the basal one shorter and 

 wider; the second joint carries on its posterior margin near the 

 distal end a narrow cylindrical process, tipped with a single long 

 seta; the terminal joint is anned with a small claw. The mouth 

 tube projects as a regular proboscis, similar in all respects to those 

 of the Lernaeopodidae. At its base on either side is a maxilla 

 made up of a stout basal joint and two 1- jointed rami of the same 

 size, each of which is tipped with two setae. The sides of the 

 second maxillae project inward in the forai of a broad flap or 

 lamina at the base of the terminal claw. The terminal joints and 

 claws of the maxillipeds project at the tip of the long fused basal 

 joints like the jaws of a chela on a long handle. The ends of the 

 basal joints between the claws are armed with short and stout spines. 



Color (preserved material), a uniform yellow-white. 



Total length, 2.25 mm. Greatest diameter, 0.66 mm. 



{comutus, horned, alluding to the attachment horns on the neck 

 of the female.) 



Remarks. — The distinguishing characters of this species are the 

 profuse armature of branched horns on the neck of the female and 

 the peculiar diagonal truncation of the head in the male. To these 

 may be added the double flexure of the neck and the transverse 

 wrinkling of the cephalothorax. the elongation and shape of the 

 trunk, the length of the posterior processes, and the large number of 

 cylinders, all belonging to the female. In the male the testes at 



