NO. 22&G. THE A jyir COPEPOD FAMILY SPHYRIIDAE— WILSON. 577 



to minute knobs; second pair in the form of spherical processes; 

 proboscis projecting very little; first maxillae reduced to tiny knobs, 

 tipped with a single spine ; niaxillipeds and swinnning legs not visible 

 in the matured adult. 



Internal generic characters of female. — Esophagus bent into an 

 S curve, entering the stomach at the anterior end ; stomach not much 

 enlarged, passing insensibly into the intestine, vrhich is narrowed 

 into a thread in the neck, widened in the genital segment, and ab- 

 ruptly contracted into a short rectum in the abdomen. A system of 

 profusely branched processes connected with the anterior portion of 

 the intestine in the trunk. Cement glands at the extreme postero- 

 lateral margins of the trunk, not segmented; ovaries just in front 

 of the cement glands; oviducts coiled inside of the cement glands, 

 coils not separated by muscles, but the latter are grouped in bundles, 

 usually two anterior and two posterior; no excretory glands visible. 



External generic characters of male. — Cephalothorax short, with- 

 out a carapace but with a large spherical swelling on either side of 

 the dorsal surface, containing the testis. Thorax distinctly seg- 

 mented, the segments increasing in size posteriorly ; no abdomen but 

 a small lobe at the posterior end of the genital segment on either 

 side, tipped with a long, stout spine. First antennae uniramose and 

 segmented; second pair uncinate, with a rudimentary endopod; first 

 maxillae biramose, rami one-jointed; second maxillae made up of a 

 single joint, tipped with a strong claw ; maxillipeds with elongate 

 basal joints, completely fused, terminal joints separate and tipped 

 with powerful claws. 



Internal generic characters of male. — Esophagus inclined to the 

 head axis, entering the stomach at the anterior end on the ventral 

 surface; stomach not much enlarged, passing insensibly into the in- 

 testine, which runs straight through the center of the body to the 

 anus. Testes paired and spherical, situated in the back of the head; 

 sperm ducts leading from their posterior ends along the center of 

 the lateral margins to the large spermatophore receptacles in the 

 genital segment. The cement glands surround the posterior portion 

 of the sperm ducts; a single large maxillipedal gland in the fused 

 bases of the maxillipeds ; a small three-lobed gland on either side of 

 the intestine in the third thorax segment ; a still smaller one on either 

 side of the intestine near the anus; minute median glands on the 

 ventral surface of the first and fourth segments and the dorsal surface 

 of the second segment, and a long frontal gland above the stomach 

 near the anterior end of the head. 



