NO. 2063. NORTH AMERICAN PARASITIC GOPEPODS— WILSON. 675 



moutli tube more than twice as long as the second antennae and 

 very broad at the base; first maxillae bipartite and slender, without 

 a palp; second maxillae much longer than the maxillipeds and rather 

 slender, armed with fleshy blunt processes rather than with claws; 

 maxillipeds with a swollen basal joint and a small and curved terminal 

 claw, whose tip fits into a pocket on the basal joint. 



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



Total length, 0.39 mm. Greatest width, 0.30 mm. 



(tumidus, swollen, applying to the head and genital process of 

 the female and the maxillipeds of the male.) 



Remarks. — This species is rare, for out of an examination of more 

 than 100 figh the type-specimen was the only one obtained. 



It may be distinguished by its general swollen appearance, by the 

 reentrant frontal margin of the head, and by the large genital process. 



CLAVELLA CANALICULATA, new species. 

 Plate 46, figa. 149 to 151. 



Host and record of specimens.~A single female with egg strings 

 and an attached male was obtained from the pectoral fin of the CaH- 

 fornia tomcod, Microgadus proximus, at Yakutsk Bay, Alaska. 



It becomes the type of the new species, and has received the num- 

 ber 39601, U.S.N.M. 



Specific characters of feTnale. — Cephalothorax slender, cylindrical, 

 considerably longer than the trunk, and turned back agamst the 

 dorsal surface of the latter; head and adjacent portion of the neck 

 enlarged and squarely truncated anteriorly; no dorsal carapace; 

 trunk elongate-ovate, somewhat flattened dorso-ventrally with a 

 deep groove on the dorsal surface into which the cephalothorax fits, 

 and a groove near the posterior end on either side, out of the bottom 

 of which the oviduct opens; genital process of medium size, and 

 incUned outward and backward; egg strings about the same length 

 as the trunk and tapered posteriorly; eggs arranged in 8 longitudinal 

 rows, about 20 eggs in a row. 



Second antemiae uniramose, the terminal joints turned down across 

 the frontal margin and meeting at the midUne; second maxiUae in 

 line with the cephalothorax, about one-quarter the length of the 

 latter, fused into a common cyfinder for their entire length and some- 

 what enlarged at the tip; bulla spherical and almost sessile; maxilfi- 

 peds placed far forward and covering the mouth tube, first antennae 

 and first maxillae, basal joint stout, terminal claw slender, with an 

 accessory claw on the inner margin near the tip. 



Cephalothorax 3 mm. long, 0.45 mm. wide. Trunk 2.5 mm. long, 

 1.5 mm. wide, 1 mm. thick. Egg strings 2.55 mm. long, 0.625 mm! 

 wide. 



