SURFACE COPEPODA OF THE GTJLF OF MAJSTNAE. 223 



Centropages gracilis (Dana). 



Centropages gracilis, Cleve, 1901, p.*5. 



Cleve, 1903, p. 359. 



Thompson & Scott, 1903, p. 247. 



Wolfenden, 1905, p. 1013. PI. 



XCVIII., fig. 7. 

 A. Scott, 1909, p. 114. 



A single example of a mature female was obtained at 

 Jokenpiddi Paar. 



Centropages trispinosus, sp. nov. 

 (PI. XVIII., figs. 5-8.) 



A single example, a female, of apparently a new species of 

 Centropages, was taken in a tow-netting at Kilakarai. The 

 single specimen obtained presents several characteristic 

 features in which it differs from all previously described speci- 

 mens, and I have therefore given it the above name. 



$ Total length, 1 • 4 mm. 



The proportional lengths of cephalothorax and abdomen 

 are 3:1. The head and first thoracic segment are quite 

 separate, as also are thoracic segments four and five. The 

 dorsum is uniformly rounded. The posterior thoracic margin is 

 rounded, and is armed with three short spines situated rather 

 towards the ventral side. The rostrum consists of two slender 

 processes. The abdomen possesses three segments having, 

 with the f ureal rami, the proportional lengths 4:3:2:2. 

 The genital segment is somewhat barrel-shaped, and has a 

 rounded sweUing on the dorsal apect. 



The first antenna, when folded back, reaches to the end of 

 the abdomen. The number and relative lengths of the basal 

 segments are not easily determined ; apparently several 

 segments are fused together to form the second joint, and 

 the eighth and ninth are also partially fused, and the 

 twenty-fourth and twenty-fifth segments completely so. 



