NO. 2063. NORTH AMERICAN PARA8ITIC COPEPODS— WILSON. 685 



pressed closely to the ventral surface of the head, so that it is difficult 

 to distinguish them, even in a side view. 



Male. — ^Unknown. 



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

 thorax, 3 mm. long, 0.5 mm. mde. Trunk, 2.25 mm. long, 2 mm. 

 wide. Egg strings, 2 mm. long, 0.90 mm. wide. 



(rectus, straight, alluding to the second antennae.) 



Remarks. — -The pointed head, the straight second antennae, and 

 the tiny maxillipeds serve to distinguish tliis species from those pre- 

 viously described. It adds one more to those obtained on fish from 

 the Pacific coast. 



CLAVELLA IRINA, new species. 

 Plate 49, figa. 177 to 181. 



Host and record of s'pecimens. — Two adult females with egg strings 

 and an attached male were taken from the gill cavity of the Pacific 

 cod, Gadus macrocepJialus, at Chignik Bay, Alaska, August 7, 1903, 

 by Dr. Harold Heath. The more perfect one is made the type of 

 the species and is numbered 43568, U.S.N.M. The other female 

 becomes a paratype and is numbered 39570, U.S.N.M. 



Specific cJiaracters of female. — Cephalothorax slender and cylin- 

 drical, the same diameter throughout and longer than the trunk; no 

 dorsal carapace; trunk oblong, flattened dorso-ventrally, with 

 rounded corners; genital process on a level with the ventral surface, 

 ellipsoidal, flanked on either side at its base mth a curved process, 

 the three together forming a conventional fleur-de-lis; egg strings 

 cylindrical, tapering posteriorly, the same length as the trunk; eggs 

 in 6 longitudinal rows, about 40 in a row. 



First antennae indistinctly three-jointed, thick at the base and 

 tapering, with tliree short terminal setae; second antennae uniramose, 

 with a long and stout basal joint and a short terminal joint bent 

 across the anterior margin, but not at a right angle. 



The tips of these antennae do not qui!e meet on the midline and 

 are roughened with minute spines. Mouth tube relatively much 

 larger than in uncinata, and projecting beyond the second antennae; 

 first maxillae bipartite, with a small palp bearing a single seta. 

 Second maxillae not in fine with the cephalothorax but paraflel with 

 the axis of the trunk, short, tapering, completely fused, but with the 

 line of demarcation plainly visible; bulla small, club-shaped. Max- 

 ilhpeds with a moderately swollen basal joint and a slender, curved 

 terminal claw, carrying an accessory claw on its inner margin near 

 the tip. These maxilUpeds are close to the mouth tube as in un- 

 cinata, but they do not cover the mouth parts quite so completely. 



Color (preserved material), a uniform yellowish- white, 



