9 o 



C0PEP0DA 



has 4 Sp and i Sa but no spinulation anteriorly; the Ri I has 3 Sa -f- 1 Sp, the Ri II has 3 Sa -)- 1 Sp 

 and the Ri III 5 S. The exopodite has 11 setae, and the L,e has 7 long -)- 2 shorter ones. The maxillae 

 are very characteristic by the strongly and suddenly convex outer margin of the basipodite. with a 

 short concavity in the middle (text-fig. 22 b) ; the lobe I possesses a quite rudimentary spinelike Sp. 1 

 and a Sp. 2, which it about twice as long as the lobe itself; the strong spine of lobe IV is somewhat 

 longer but scarcely stronger than that of lobe V. The third basipodite of the maxillipeds is i - 2 as long 

 as Basp. I — II and three times as long as Ri; the exterior margin of the second basipodite has no trace 

 of lamina, and its fourth lobe bears 3 hairs and a sensory process (fig. 2 c PI. III). 



The first pair of legs has the articulation between Re I and II indicatad by a faint line 

 anteriorly, and sometimes a small incision laterally; the Se Re I is wanting; the St has the usual 



Text-fig. 23. Gaidius tenuispinus G. O. Sars. 

 a. 9. Abdomen in lateral view X 33- b. Maxilla sin. in posterior view. c. Pes IV sin. in posterior view X 82. d. <j\ Pes 

 V sin. X 140. e. Maxilla dext. in anterior view to show position of parasites X 60. f and g: the same parasites X 150. 



h— j. Contorted bodies attached to the body-wall X 400. 



characteristic structure (PI. Ill fig. 2 d). The articulation between Re I and II in pes II and Ri I and 

 II is as shown in Sars' figure well developed; the St has 25 teeth. The fourth pair of legs has 

 the Re III three times as long as wide and the St. has 25 teeth, partly armed with accessory ones; the 

 first basipodite has the usual marginal hairs substituted for by 30—40 stiff thin lamellous bristles, 

 which are placed in about 5 rows along the inner margin, and in 2 — 3 parallel ones on posterior surface, 

 the more posteriorly the more distally placed. The arrangement and number of the glandular pores 

 in pes I — IV are as in Ch. obttisifrons. 



The lateral view of the labrum is like that of Chiridms, but the different parts are less 

 prominent. The oral surface of the labrum (PI. Ill fig. 2 e) is, as seen by comparing figures, 

 distinctly different from Gaidius brevispinus; the five groups, as well as the sixth more transversely 



