628 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxviii. 



The two pairs of maxilla? have wide wings along either side of the 

 the central spines; in the second maxillae, although the spines are well 

 separated and divergent, these wings nearly touch each other at the 

 center. The first maxilliped has a spatulate lamella instead of a spine 

 inserted in the inner margin of the terminal joint near its center. 



The second maxillipeds are large and stout, with a swollen basal 

 joint furnished on the posterior ventral margin, where it joins the 

 bod}^, with a stout tongue-like lamella which projects downward at a 

 right angle to the ventral surface. The terminal claw is three-quarters 

 as long as the basal joint, rather slender, and furnished with a very 

 long and hair-like accessory spine on its inner margin. Furca large, 

 the base longer and narrower than the branches, and both base and 

 branches strongly flattened into fan-like lamella?. The branches are 

 nearly twice as wide as long, with radiating ridges and lines extending 

 outward from the thickened center. The median sinus is triangular, 

 the branches being so widened toward the tip as to nearly meet. 



The first swimming legs have a small spine on the end of the basal 

 joint pointing outward, and a much stouter, blunt spine on the pos- 

 terior border of the same joint pointing backward. 



The three claws on the terminal joint are about equal, with serrated 

 lamella? along their posterior margins. The second legs have a wide, 

 rounded flange or wing along the outer margin of the exopod. The 

 fourth legs are stout and four-jointed; the basal joint is swollen and 

 carries a slender, flexible hair on its outer margin near the distal end. 



The short curved claw at the tip of the second joint, and the longer 

 ones on the third and fourth joints, are flanged on one or both sides 

 with serrate lamina?. 



The fifth legs are distinct and of medium size, plainly visible ven- 

 trally, but not dorsally. 



Total length, 7.5 mm.; length of carapace, 4 mm.; width of same, 

 3.75 mm.; length of genital segment, 2.25 mm.; length of abdomen, 

 0.6 mm.; length of egg strings, 5.5 mm. 



Color a delicate pinkish yellow, with small pigment spots of a pur- 

 plish or reddish brown distributed evenly over the entire dorsal sur- 

 face, so that the color is uniform throughout. 



Under strong magnification each spot is seen to be very irregular, 

 and to consist of a dark-blue center bordered with purple, in both of 

 which the pigment is in small granules of uneven size, those in the 

 purple being the larger. From this granular center narrow convo- 

 luted processes extend outward in every direction. In these the pig- 

 ment is dark orange in color and is not granular, but like a water- 

 color wash. The combination is veiy striking, and affords the most 

 noteworthy instance of pigmentation thus far found among these 

 parasites. 



