﻿156 



COPEPODA 



r^ 



U- 



The lamina labialis does not show auy features of interest (fig. 2 d); the area in front of it is most 

 hke that of Chiridms\ it consists of a lateral, somewhat convex, row of fairly long setae and two median, 

 well separated, groups, as shown in fig. Behind the lamina and between the labial lobes, which were 

 not studied in detail, no setae were observed. 



Ycf (St. V). Size of specimen from St. 183 was 9 mm.; anterior division 6-5 mm.; urosome 2-5 mm. 

 The shape of the body is in main respects like that of the females, but the lateral corner of 

 the thorax has a small tooth ; of the four abdominal somites the second is longer than the third, which 

 is as long as the first. The measurements of the antennulae are somewhat different; the segments 

 17 and 19, which are of equal length, are 1-24 as long as 24-^^25, and 2-5 as long as segment 14. The 

 other appendages do not seem to show differences of any importance; the Re of the maxillulae pos- 

 sess, as usual in this stage, only 10 setae. The pes V of the male is somewhat like that of Eiichcpte\ 

 the Ri, which is almost twice as long on the right side as on the left side, is distally rounded without 



any spines; the Re, which are of almost 

 equal length, are continued into a rather 

 strong spine (St), and have on each side 

 one or two Se, as well as 2 or 3 Si. The 

 structure of the pes V is distinctly diffe- 

 rent from Scott's fig. 26 of the corres- 

 ponding pair of legs in V.gigas, as well as 

 from Brady's fig. 5 of Euchate gi^as. 

 Y (St. III). Specimen from Thor 

 St. 183: 5-58 mm.; anterior division 4-5; 

 urosome i-o8. 



The rostrum and the frontal parts 



are like those of the adult females; the 



lateral corners are neither jDroduccd nor pointed; the first as well as the fifth thoracic tergites are well 



marked out. The abdomen consists of two somites, of which the terminal one is almost twice as long 



as the basal one. 



The antenmilae extend almost to the end of the abdomen; the "^sthetasken" are as in the 

 adults, but the Spr. was only observed in segment 19. The measurements are distinctly different, as 

 the distal segments are comparatively longer; the segment ig is 1-3 as long as 17, and scarcely i-i as 

 long as 240^25, which is 1-2 as long as 17. The mouth appendages, except the maxilhdae^ are practically 

 like those of the adult; the Le had in the single specimen examined a single proximal long seta and 

 3 very delicate hairs distally; the Li I has only 10 setae, and the Re as usually 8. 



The pes /differs distinctly from that of the adult by the more slender form especially of Ri; 

 both branches are undivided; the 3 vSe are well developed, and a glandular pore is found in the third 

 division. The pes II ha.s both branches unsegmented; the Re I — III has 6 Si and 4 Se; only at the 

 base of Se 3 Re III is a glandular pore found. The/« /Fis comparatively more slender than pes II; 

 the Re IcvsJII have 3 Si and 3 Se, and a single glandular pore; the Ri I cv HI have 6 setae altogether. 

 In lateral view tlie labruui and labial appendages are scarcely different from those of the adult 



Text-fig. 44. ValdivieUa insignis Farr. 

 a. f 9- Abdomen X 8- 1>. f9. Pes III Ri III in anterior view with gland X 59- 



c. Yo'lvSt. V). Left lateral corner X 16. d. YcfiSt. V). Pes V in ant. view X iS- 



