142 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iis 



AIeasurements. — One complete, two incomplete females (male not 

 measured) : 



mean (mm.) range {mm.) 

 Greatest length, excluding caudal filaments (1 specimen) 21.84 



Greatest length of cephalothorax (1 specimen) 4.27 



Greatest width of cephalothorax (1 specimen) 5.25 



Greatest length of neck (1 specimen) 7.42 



Greatest length of trunk or genital segment (3 speci- 

 mens) 11.29 10.64-12.04 

 Greatest width of trunk or genital segment (3 speci- 

 mens) 3.38 2.87- 3.64 

 Greatest length of caudal filaments (2 specimens) 11.34, 10.71 

 Length of egg strings (3 specimens) 18.08 16.66-19.39 



Diagnostic description of female. — Body (fig. 39a) divisible 

 into 3 regions, miiltilobed anterior region (cephalothorax), elongate 

 neck, and irregular trunk (genital segment) . Trunk with small, bi- 

 lobed abdomen posteriorly, abdomen with pair of smooth elongate 

 processes (caudal filaments) whose place of origin suggests possible 

 association with the caudal rami. 



Cephalothorax (fig. 396) and most of neck embedded in host, 

 cephalothorax consisting of 2 large knobs forming anterior region; 

 single flaplike lobe arising from posteromedian dorsal surface of knobs 

 and projecting posteriorly over anterior end of neck; 6 pairs of knobs 

 arising from ventral surface. Anteriormost pair of ventral knobs 

 almost contiguous on median longitudinal axis, overlapping oral region. 

 Neck 2-parted, slender, mdth approximately one-eighth that of ceph- 

 alothorax although varying somewhat throughout length. Anterior- 

 most part of neck less than twice the length of posterior, appearing as 

 extension of median posterior cephalo thoracic surface; second part 

 appearing as extension of trunk. Trunk narrower anteriorly than 

 posteriorly, with constrictions on anterior end giving annulated appear- 

 ance. Lateral margins irregular; posterior end (fig. 39c) with distinct 

 sinus medially, slightly projecting lateroposterior regions rounded. 

 Single abdominal segment (fig. 39c) arising at apex of sinus, not pro- 

 jecting past lateroposterior regions of trunk, posterior end indented at 

 anal opening, with pair of caudal filaments arising from dorsal sm'face. 

 Caudal filaments slightly shorter than trunk, rod-shaped, without 

 distinct irregularities. Egg strings projecting from oviducal openings 

 situated just lateral to abdomen, on lateral surfaces of sinus in posterior 

 end of trunk. 



Appendage complement consisting of paii" of mandibles, 2 pairs of 

 maxillae (using Wilson's 1919 appendage designation) and pair of 

 small, irregular processes, posterior to maxillae, that may be max- 

 illipeds. Mandibles (fig. 39c?) minute, rodlike, structiu-al details not 

 determined. Maxillule (?) (fig. 39^) minute, situated just lateral to 



