706 PROCEEDINGS OF THE NATIONAL MUSEUM. 



have received Cat. No. 39581, U.S.N.M. Three females were taken 

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

 which have been given Cat. No. 39591, U.S.N.M. Seven females and 

 one male were taken off the North Carolina coast, and have received 

 Cat. No. 39573, U.S.N.M. The host is the same for all these speci- 

 mens, the channel bass, Scienops ocellatus. 



Specific characters of female. — Cephalothorax stout, cj^lindrical, and 

 considerably longer than the trunk; head enlarged and covered with 

 a dark brown carapace; neck and second maxillae curved like a 

 sickle; trunk anteriorly narrowed into a short neck Avhere it joins the 

 cephalothorax, posteriorly inflated into a sphere, which is flattened 

 dorso-ventraUy ; four posterior processes, two dorsal and two ventral, 

 and a genital process between the two latter, short and club-shaped; 

 the ventral posterior processes are straight, parallel, and longer than 

 the dorsal pair, which arise a little in front of the posterior margin 

 and are curved like parentheses marks; between the two pairs are 

 the egg strings, which are from one and a half to two and a half 

 times the length of the processes, and about twice their diameter; 

 eggs smaU, in from 10 to 12 longitudinal rows, about 50 eggs in a row. 



First antennae somewhat swollen at the base and three-jointed; 

 second antennae biramose and turned down across the frontal 

 margin, tlie endopod (dorsal ramus) large, bluntly rounded, one- 

 jointed, and unarmed, the exopod (ventral ramus) comparatively 

 minute, two-jointed, and terminated by a tuft of small setae. 



Mouth-tube short, broad at the base, and hardly reaching the 

 second antennae; first maxillae bipartite, palp one-jointed and 

 tipped with a single spine. Second maxillae short, slender, and 

 entirely separate as far as the buUa, which is in the shape of a flat- 

 tened sphere. The glands at the bases of these maxillae stand out 

 as prominent knobs on either side of the neck. 



Maxillipeds with, a stout basal joint and a slender terminal claw 

 which shuts down against a knob on the inner margin of the basal 

 joint. 



Color (preserved material), a light brownish-yellow. 



Cephalothorax, 4.65 mm. long, 1 mm. wide. Trunk, 3.25 mm. 

 long, 3.25 mm. wide, 2 mm. thick. Second maxiUae, 1.50 mm. long. 

 Posterior processes (ventral), 3 mm. long. Egg strings, G mm. long, 

 0.80 mm. mde. 



Specific cliaracters of male. — Head at an angle of 45° with the body 

 axis, and covered with a distinct dorsal carapace; trunk with the first 

 and second segments forming a narrow neck or waist, the posterior 

 portion narrow ovate and ending in a pair of slender anal laminae, 

 which are conical and at right angles to the trunk axis. First an- 

 tennae slender and three- jointed; second antennae biramose, the 

 endopod smoorhly rounded, the exopod with a single spine at the 



