﻿COPEPODS FROM LAKE ERH HAI, CHINA — HSIAO 



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it as follows: (1) The f ureal rami are only twice as long as wide; (2) 

 the terminal setae of the last joint of the endopodite of the fourth leg 

 are not elongated; the inner longer seta is only 1,36 times as long as 

 the joint itself, which is 3.7 times as long as broad, while Kiefer (1931, 

 p. 507) gives 2.3-2.6, average 2.4-2,5:1 for this ratio; and (3) the 

 seminal receptacle has a different structure from Kief er's figure ( 1929b, 

 p. 40, fig. 13). 



Figure 23. — Tropocyclops breviramus, new species: a, Female, dorsal view; b, first antenna 

 of female; c, genital segment of female, ventral view; d, same, lateral view; ^.fourth leg of 

 female;/, third leg of female; g, abdomen of male, dorsal view; h, first leg of female; i, gen- 

 ital segment of female, dorsal view; /, fifth rudimentary leg of female; k, second leg of 

 female; /, genital segment of female, ventral view. 



Description. — Female : General body appearance similar to Eucy- 

 clops serrulatus extensus described above, but only one-half its size ; 

 total length, executive of caudal setae, 573/x. Body flattened; an- 

 terior end of cephalothorax slightly truncate, fifth thoracic somite 

 very small, as wide as the anterior portion of the genital segment, with 

 rounded lateral edge armed with evenly spaced row of long stiff hairs 

 (fig. 23, C5, <?). Abdomen consisting of four somites. Genital somite 

 longer than broad, as long as the next two somites together, anterior 

 portion slightly broader than the posterior; two ovisacs, each with 

 two large ova, attached on the dorsal side through an elongated oval- 

 shaped orifice near the anterior end of the somite (OR in fig. 23, ^). 

 Seminal receptacle in two lobes as shown in figure 23, c, d. Figure 23, Z, 

 shows the seminal receptacle of another individual. In both cases 

 the organ is apparently unlike Kiefer's description, which gives a 

 larger anterior portion snakelike in form and a smaller posterior por- 

 tion, which is curved dorsally on the sides. Here the division into two 



