﻿COPEPODA 



119 



second grojip is represented l)y a longitudinal row of about 20 minute spines; the third group (cf. 

 PL IV fig. 3 c) consists of 5 fairly long and slender setae placed more forwards, and lateral, and of 2—3 

 placed more inwards and backwards; the foiirtli group, which consists of 20—25 fairly strong setae, 

 has a characteristic shape, as it is convex, and has its right and left parts converging towards the 

 middle, and almost touching each other in front; the Jiftli group is a continuation backwards of the 

 fourth, and consists of about 30 more delicate setae. Behind this group an oblique, almost transverse 

 row of short "spine.s" is observed. Behind the central spot Nr. 3 no transverse row of setae is ob- 

 served, but behind Nr. 4, which is single, two transverse rows of rather delicate setae are observed. 

 The lamina labialis (fig. 3 d), which is distinct!}- granular, is indistincth' divided into three parts. In 

 front of it, in the middle, is a longitudinal row of short spines on each side, followed by the two areas 

 of acicules, forming a curvature corresponding to the outer row of setae (cf. fig. ic); the latter is single 

 behind, double in front, as a lateral row of shorter setae is found. The arrangement of tlie spinous 

 areas behind the lamina as well 

 as of the series of hairs on the 

 labial lobes is seen in figs 3 d — e. 



The intestinal tract is 

 almost straight, with a short 

 restriction between the anterior 

 and posterior divisions, and with 

 a slender coecal sac in front. 



iS- Size of male from 

 Thor St. 88 373 mm.; anterior di- 

 vision 2'92mm.; urosomeo-8i mm. 



The head has a distinct 

 frontal keel (fig. 3f), somewhat 

 longer and lower than in the 



female; the body is rather elongate, and attenuated in front as well as behind. The head and the first 

 thoracic tergite are completely fused; the articular membranes between the thoracic tergites are like 

 those of the females. The anterior division is 3-5 as Ion* as the urosome; the genital pore is found 

 on the left side of the first abdominal somite; the f ureal rami are short, rounded, and about as long as 

 wide; their St. 2 is a little longer than the abdomen, and almost twice as long as the Si. 



The ant oni lilac extend a little bevond the end of the cephalothorax; the segments 2 and 3, 4 

 to 7, 8^9 and 10 as well as 11 to 14 are more or les fu.sed; the segments 20—21 are completely fused 

 on the right side, well separated on the left side. The appendages are scarcely different from those of 

 E. inessincnsis; they are as a whole more soft-skinned than in the female, and the Sp. of segment 23 

 is much shorter than that of segment 24. The segment 2 is almost vi as long as segment 17, whicli in 

 length is equal to 15, 16 and 19, and about it as long as segments Scvg. Segment 20 is on the left 

 side about as long as 8cvg, but 20<^2i on the riglit side comliined is the longest segment, and almost 

 1-4 as long as segment 2. The antoniar have the Re 1-5 as long as Ri, and have well developed distal setae; 

 the Re I and II are well separated, l)ul the medial tooth of Re I is wanting. The Le of the waxilluhic 



Text-fig. 30. EuchircHa cttrticauda Giesbr 

 a. f9. Pes II sin. in ant, view x 40. b. fj. Pes III x c. 40, c. y9 (stage V). Pes III 

 X c. 40. d yj (stage IV, a single specimen from Thor -°\b 1905 St. SS not men- 

 tioned in the text). Pes III sin. X c. 50. e. yQ (St. VI. Pes V X 60. 



