232 



COPEPODA 



The first -pair of legs is like that of the preceding species; the Se of the Re I extends some- 

 what beyond the end of the Re II. The endopodite has on its posterior surface 3 + 2 spines; the 

 exopodite has 5 spines at the base of Se Re I, 6 spines at the base of Si Re II, and near the inner 

 margin of Re III three groups consisting of 4, 3 and 3 spines. The endopodite of the second pair of legs 

 has a long pointed Se in the Re I; on the posterior surface of Ri I a group of 5 fairly strong spines is 

 found, and in Ri II two outer rows of 6 spines and an inner one of 8 weaker spines. The terminal seta, 

 which is like that of the preceding species, is as long as the third outer segment; on the posterior surface 

 of the third basipodite and the exopodite groups of rather short spines are found ; the number of glandular 

 pores is like that of O. magnus. The armature of the posterior surface of the third pair of legs is like 

 that of the preceding species; the endopodite has 5 long spines in Ri I, a curved row of 7 long spines 

 and an inner group of about 20 setae in Ri II, and in Ri III groups of 5 strong and 12 short spines; 



the exopodite has a number of short spines and 

 bristles. The third outer segment is, as shown in 

 text-fig. 73 b, curiously short, probably due to ac- 

 cident; a similar abnormal structure has been 

 described by Wolfenden in the fourth pair of legs 

 of the male of C. cheli/er (1911 p. 283). The fourth 

 pair of legs has the armature somewhat less 

 developed, but the third outer segment was trans- 

 formed in a similar way. The terminal segments 

 of the third and fourth pairs of legs were only 

 examined on the left side, as they were wanting 

 on the right side. 



The fifth pair of legs (text-figs 74 c e) con- 

 sists of three segments, which are almost com- 

 pletely smooth on the anterior surface, but post- 

 eriorly at least in distal half of the segments, they 



are covered with fairly long stiff hairs; the left leg has terminally a bifurcate process (fig. 74 d), and 

 in the right a three-divided one (fig. 74 e) is found. 



The lateral view of the labrum etc. is like that of the preceding species; the organs were 

 not examined in detail in the single specimen at my disposal. 



fc?. Size of male from Thor St. 183 was 4-04 mm.; anterior division 3-05 mm.; urosome 0-99111111. 

 The shape of the cephalosome is scarcely different from that of the female (text-fig. 74 f). The 

 abdomen has, as usual, five somites, but the fifth one is scarcely visible from above; the comparative 

 length of the four somites and the furcal branches, which are as long as wide is 25, 40, 33, 20 and 

 12. The distal segments of the antennulae were wanting; the proximal segments are like those of the 

 preceding species. The antennae, mandibulac and maxilhilae show the same differences from those of 

 the female as in O. cristatus. 



The maxillae are in general shape like those of the preceding species (cf. PI. VII fig. 6c); the 

 structure and arrangement of the 8 sensory setae in the endopodite are seen in text-fig. 74 g. The 



Text-fig. 74. Onchocalanus hirtipes G. O. Sars. 



a. f 9. Genital somite X 33- b. fp. Pes III Re III X 59- c. 9. 



Pes V sin. d-e. f9. Pes V Re III sin. et dext. X 150. f. frf- 



Abdomen X 33- g. Maxilla sin. in ant. view X 150. h. fd 1 . 



Pes V in ant. view X 59- i- fd 1 - Pes V sin. Re III. 



