NO. 2063. NORTH AMERICAN PARASITIC COPEPODS— WILSON. 707 



outer corner. Mouth tube projecting its entire length in front of 

 the anterior margin of the carapace in line with the head axis. First 

 maxillae tripartite, palp tipped with a single spine; second maxillae 

 considerably longer than the maxillipeds and tipped with powerful 

 claws, which shut into a socket on the inner margin of the basal joint. 



Maxillipeds short and stout and tipped with a strong claw; genital 

 process distmctly visible between and partly behind the second 

 maxillae, with a fringed or fluted tip. 



Color, a whitish-yellow, lighter than the female. 



Total length, 1.45 mm. Greatest mdth, 0.65 nun. 



{gulosus, gluttonous.) 



Bemarks. — In the second lot of parasites mentioned there were 

 three young females, one of them only 1 mm. long. These females 

 had but a single pair of posterior processes, the ventral ones, but in 

 the largest of the three another pair were just starting on the dorsal 

 surface. Evidently, therefore, the ventral pair are formed first and 

 the dorsal pair grow out later to supplement them. The general 

 appearance, the arched neck, the distinct carapace, the knoblike 

 protrusions of the maxillary glands, the short and slender second 

 maxillae, and the arched dorsal processes distinguish this species 

 from its nearest relatives. 



BRACHIELLA ELEGANS Richiardi. 



Plate 54, figs. 226 to 233; plate 55, fig. 234. 

 Brachiella clcgans Richiardi, 1880, p. 151. — Brian, 1899, p. 8, fig. 4. 



Host and record of sijecimens.— Five females and a male were ob- 

 tained from the gill cavity of the amber jack, Seriola lalandi, at 

 Woods Hole, Massachusetts, by the late Dr. M. T, Thompson, Sep- 

 tember 11, 1901. 



They have received Cat. No. 39585, U.S.N.M., and since no other 

 specimens are in existence at the present time they will serve as 

 surrogate types of the species. 



Siiecijic characters of female. — Cephalothorax short, flattened dorso- 

 ventraUy, and about the same length as the second maxillae; head 

 somewhat enlarged and covered with a dorsal carapace; neck ex- 

 tremely short and passing insensibly into the trunk without any sign 

 of demarcation; trunk elongate-triangular, Avidest across the pos- 

 terior margin, which is almost squarely truncated; two pairs of 

 posterior processes and a very short and well rounded genital process ; 

 ventral processes originating close to the midline, somewhat divergent 

 and curved like parentheses marks, and three-fourths as long as the 

 trunk; dorsal processes less than half the length of the ventral, 

 originating close to the lateral margins, and widely divergent, in some 

 cases even standing out at right angles to the trunk axis; egg strings 

 about the same length as the trunk; eggs minute, in 6 or 7 longi- 

 tudinal rows, about 30 eggs in a row. 



