NO. 2194. NOItTH AMERICAN I'AKAiSJTlC VOPEPODti— WILSON . 73 



First antennae short, slender, curved sharply backward, and veiy 

 indistinctly segmented, if at all, rather well supplied with setae at 

 the tips and along the outer margins. Second antennae large and 

 stout and three- jointed, basal joint the narrowest, terminal joint 

 strongly flattened and in the form of an equilateral triangle, whose 

 apex is articulated with the second joint and whose base is distal, 

 twice the width of the basal joint, and armed wnth a powerful chela, 

 made up at the outer angle of a long sickle-shaped claw whose tip 

 shuts down inside a stout process at the inner angle; this claw is 

 operated by strong muscles which fill the interior of the joint. Pro- 

 boscis cylindrical, of about the same diameter as the carapace and 

 strongly protrusile (fig. 72). It is usually extended straight in front 

 of the head, but can be moved about in various directions. 



At the tip the upper lip divides into two lobes, which stand out 

 prominently when the proboscis is retracted, but are folded over 

 tightly again.st its side Avhen it is extended. The underlip forms 

 a single median lobe, which is also more prominent in the retracted 

 proboscis. 



Between these lobes extends the mouth tube, much as in Lernaeeni- 

 nis; it is very short and less than half the diameter of the proboscis, 

 and the opening is surrounded by a deeply fringed membrane. Be- 

 neath the center of the upper lip and dorsal to the esophagus lies 

 a tripartite eye, which is very distinctly visible in the cleared 

 specimen. 



This eye is still farther out toward the tip of the proboscis than 

 in Lernaeenicus^ but otherwise its general relations are the same. 



On the sides of the mouth tube are the second maxillae, three- 

 jointed, the basal joint long and slender, the second joint three-fifths 

 as long and carrj'^ing a small process on the inner margin, the termi- 

 nal joint in the form of a curved claAv, nearly as long as the second 

 joint. 



Just above the bases of these second maxillae there is on either 

 side a tiny, one-jointed process, tipped with two minute setae, which 

 represents the first maxilla. TJiose can only be seen in an end view 

 since they are in the bottom of the groove between the lips and the 

 mouth tube, and are entirely concealed by the lobes in a side A'iew. 



The three pairs of legs are close together on the ventral surface of 

 the thorax: the basal plates of the first two pairs are broadly tri- 

 anuglar, those of the third pair are narrow oblong; the two former 

 are biramose while the latter is uniramose, and the rami are each two- 

 jointed and tipped with two or three long setae. 



Internal specific characters of female. — Esophagus nearly in line 

 with tlie head axis; stomach considerably enlarged, but not sending 

 out processes laterally and not convoluted. Intestine narrowed 

 through the neck, then enlarged in the anterior \runk, where it passes 



