4 AMERICAN MUSEUM NOVITATES [No. 81 



segment, one-third the width of the genital segment. Anal lamina; elongate-lanceo- 

 late, acuminate at the tips and destitute of setae. 



Egg strings cylindrical, slightly curved like parenthesis marks, tapered at both 

 ends and about as long as the entire body. Eggs minute, irregularly arranged in 

 about 25 rows, 75 to 80 eggs in each row. This is an unusually large number of eggs 

 and indicates that the dangers encountered during development by this species are 

 also unusually severe. 



First antenna 1 6-jointed, filiform and but slightly tapered; the relative lengths of 

 the six joints may be expressed by the numbers 7, 33, 12, 8, 8, 12. The basal joint has 

 a short seta near the center of its anterior margin, and the terminal joint has a tuft of 

 setae at the tip and several on its posterior margin. The second antennae are imme- 

 diately behind the first pair and are 4-jointed, the basal joint the shortest, the second 

 joint as long as the third and fourth together. The third joint carries a small seta 

 on its anterior margin at the distal corner; the terminal joint is tipped with a tuft 

 of long setae. The form of the mandibles and maxillae could not be definitely ascer- 

 tained from any of the three specimens. The maxillipeds are situated some distance 

 behind the mouth and their basal joints are so large that they cover much of the 

 ventral surface of the head. Each is composed of this basal joint and a curved 

 terminal claw; they are evidently the organs of prehension. Color (preserved mate- 

 rial), a uniform yellowish-brown without markings; egg strings light orange- 

 yellow. 



Length, 4.40 mm. Width of third thoracic segment, 1.25 mm. Egg strings, 4.35 

 mm. long, 0.50 mm. wide. 



The points of particular interest about this new parasite are the very 

 considerable depth at which it was found and the exceptionally large 

 number of eggs in its egg strings. The way in which the parasite and 

 host come together would be of great interest, and this in connection 

 with the development stages of the copepod will form one of the most 

 instructive problems for future development. 



