﻿COPEPODS FROM LAKE ERH HAI, CHINA — HSIAO 163 



spine on outer distal corner, one seta on mesial side ; second exopotlite 

 segment with one long seta on inner surface ; third exopodite segment 

 provided with one short spine on outer distal corner, two setae on mesial 

 and three on terminal aspect; outer surface of second and third exo- 

 podite segments also provided with short hairs along the whole length 

 (fig. 20, c). The next three pairs of legs similar, having two basal 

 segments, three endopodite segments, and three exopodite segments, 

 and similar number of setae on homologous joints (fig. 20, d-f) ; first 

 basal segment wdth one seta on distal inner corner, longer than the 

 length of basal segment 2, which is unarmed; first, second, and third 

 endopodite segments with one, two, and three setae, respectively, on 

 inner aspect, while the last has in addition one seta on outer and 

 three setae on terminal surface, making a total of seven ; each exopo- 

 dite segment with one short spine on outer distal corner, first and 

 second exopodite segment each with one seta on distal inner corner, 

 third joint with three setae on each of mesial and terminal surfaces; 

 terminal setae plumose and nearly as long as the whole leg. "Schmeil's 

 appendage" present on second endopodite segment of second leg (fig. 

 20, d, I). 



Fifth pair of rudimentary legs (fig. 20, g) symmetrical; first basal 

 segment with a strong hyaline spine on distal outer angle, second with 

 a sensory hair on outer surface, but no rounded hyaline protuberance 

 on inner surface (a feature that also helps to distinguish this species 

 from T. hebereri). Endopodite consisting of one single piece, equal- 

 ing two-thirds the length and one-third the diameter of the first 

 exopodite segment ; distal end of endopodite provided with two strong 

 spines (one may be twice as long as the other, or they may be subequal 

 in length) and a few small bristles; on the distal end of mesial aspect 

 a small but distinct sjpinule distinguishes this species from T. hebereri. 

 Exopodite consisting of two obvious sections, but the presence of a 

 rudimentary third joint is indicated by a small depression on the outer 

 aspect of the distal end of the second joint, where a stout but short 

 spine arises in addition to a long filamentous seta, which is about as 

 long as the big claw that forms the distal continuation of the second 

 exopodite segment; both filamentous seta and claw provided with a 

 fine hairs along their lengths. 



Male: Anterior body region more ellipsoidal than in female, for 

 there is less outflaring of the posterior end of last thoracic segment 

 (fig 20, i) ; fourth and fifth segments not fused together, and without 

 a dorsal protuberance (fig. 20, jj) as in female; posterior outer angle 

 ends in a sharp spine on each side, though much expanded ; abdomen 

 in five segments, asymmetrical, the right side being better developed 

 than the left, particularly the fourth segment; f ureal rami and their 

 setae similar to those of female. Length, exclusive of caudal setae, 

 1.4—1.45 mm. 



