COPEPODA 



62. Scaphocalanus validus Farran. 



(PI. VII figs 1 1 a b; text-figs 62 a f.) 



1908. Scolecithrix valida n. sp. Farran, pp. 55 57, pi. V figs 1415, pi. VI fig. 7. 



Description. f$. Size of specimen from Thor St. 183 was 3-95 mm.; anterior division 3-1 mm.; 

 urosome 0-85 mm. Farran's specimens measured 3-8 3-95 mm. 



The body is more slender, and the head less suddenly raised in lateral view than in S. obtusi- 

 frons, but more distinctly so than in S. globiceps (text-figs 62 a b). The rostrum is most like that of 

 the former species, with the basal part less enlarged and with fairly long, apparently undivided, filaments. 

 The lateral corners are slightly produced and rounded (text-fig. 62 c). The genital somite is better produced 

 below, and its receptaculum seminis appears more slender than in the preceding species ; the comparative 



length between the abdominal somites and the furcal rami is 

 45, 28, 25, 9 and 17; the furcal rami are i - 5 as long as wide; 

 along the hinder border of somites II IV a marginal seam 

 with delicate serrations is observed. 



The antennulac do not reach the end of the furca; the 

 segments 24 25 are fairly well separated ; "^sthetasken" are 

 found in segments 80^9, 12, 14 and 19; the segment 10 has a 

 distinct seta, and a proximal seta is found in segments 12 14 

 18, and sometimes in segment 15, but never in segment 17; 

 the Sp. of segment 24 is somewhat longer than segment 25. 

 The segment 19 is distinctly rz as long as segments 8^9 

 and 15, which are of almost equal length; segment 16 is rz 



Text-fig. 62. Scaphocalanus validtis Farr. f9- 

 a. Head X 33- b. Rostrum from the right X 59- 



c. Genital somite x 33- d. Pes II sin. in anterior as long as 15. The third basipodite of the niandibulae seems 



view X59- e. Pes III sin. X 59- 

 sin. X 15- 



St. pes II 



h j setae mediall in ot]]er ctg the nlandi . 



bulae as well as the antennae are like those of the preceding 

 species. The maxillulae have 7 + 2 setae in the Le, 10 + 2 in the Li I, 2 in Li II, 4 in Li III and 5 

 in the third basipodite; the Ri I has 3 setae, the Ki II co HI 5 and the Re has 9 setae. The maxillae 

 and maxillipeds are scarcely different from Farran's description. 



Theflrst pair of legs has the Se Re I extending to the base of Se Re II; in the outer edge of 

 the Re III, proximally to the middle, a distinct glandular pore is found, better developed than in other 

 species. The second pair of legs (text-fig. 62 d) is like Farran's fig. 16 PI. V; the Se of Ri I is 

 rather short and clumsy, and the St. of Re III has about 35 serrations, some of which are fused at 

 their base (text-fig. 62 f|; the anterior surface of the appendage is minutely granular, and the posterior 

 one has, in addition to the usual spines, areas of smaller teeth. No glandular pores were observed. 

 The third pair of legs (text-fig. 62 e) has no distinct styliform process at the inner margin of the second 

 basipodite, and the slender terminal tooth of the anterior surface of the third basipodite medial to 

 the insertion of the endopodite is very short and clumsy; the posterior surface of the third basipodite 

 has a number of short spines in contrast to that of the second foot, which is smooth; in other respects 

 this pair is like that of the preceding species. The fourth pair of legs has a long and slender second 



