546 PROCEEDIXGS OF THE NATIONAL MUSEUM vol. 94 



The first maxilla is a long slender rod divided into three very slender 

 prongs at its tip. The second maxilla has a stout basal segment and 

 a long, stout, somewhat twisted claw. The basal segment of the 

 maxilliped is rather slender and the terminal claw is nearly straight. 

 The first four pairs of legs are biramose and the rami are 3-segmented ; 

 the arrangement of the spines and setae on the first and third legs 

 is shown in figures 159 and 160. The fifth legs are uniramose and 1- 

 segmented with two terminal setae and one on the outer margin near 

 the tip, and a fringe of short hairs proximal to this outer seta. Total 

 length, 1.15 mm. Greatest width, 0.65 mm. 



Remarl's. — This genus resembles Clausidhim in its general make-up 

 and undoubtedly belongs to the same family, but it differs in so many 

 particulars from the other members of the family that it must be 

 placed in a genus by itself. 



PESTIFER," new genus 



Head and first four thoracic segments more or less fused to form a 

 cylindrical body ; fifth segment free, much narrower than the fourth 

 segment but wider than long. Genital segment subspherical, wider 

 than long; abdomen small, 1-segmented ; caudal rami jointed. 



First antennae slender, 7-segmented, segments very unequal in 

 length; second antennae and maxilliped prehensile. Four pairs of 

 biramose legs, rami 2-segmented, the endopods much shorter than the 

 exopods. Egg strings cylindrical, eggs minute and very numerous. 



Genotype. — Pestifer agilis, new species. 



PESTIFER AGILIS, new species 



Plate 31, Figitees 1G5-171 



Two females with ovisacs were obtained from the skin of an annelid 

 dredged from a depth of 380 fathoms, July 18, 1932, near the Tortugas 

 Islands in the Gulf of Mexico. One has been selected as the holotype, 

 U.S.N.M. No. 79641. 



Female. — Description the same as for the genus. Cylindrical body 

 three times as long as wide, narrowed anteriorly, broadly rounded 

 posteriorly. Fifth segment four times as wide as long and about the 

 same width as the genital segment, which is one-third wider than 

 long. The abdomen is minute and is made up of a single segment 

 twice as wide as long with a deep posterior sinus. Caudal rami 

 cylindrical and longer than the abdomen, each tipped with a single- 

 jointed seta. The egg strings are cylindrical and two-thirds as long 

 as the entire body ; the eggs are minute and very numerous, 2,500 to 

 3,000 in each ovisac. The first antennae are slender and 7-segraented, 



* Peatifcr, bringing vexation. 



