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COPEPODA 



52. Scaphocalanus validus Farran. 

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



1908. Scolecithrix valida 11. sp. Farran, pp. 55- 57. P'- V figs 14— 15> pl- VI fig. 7. 



Description, f?. Size of specimen from Tlior St. 183 was 3-95 mm.; anterior division 31 mm.; 

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



The body is more slender, and the liead less suddenly raised in lateral \ie\v than in S. obhtsi- 

 froiis, 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 1-5 as long as wide; 

 along the hinder border of somites II — IV a marginal .seam 

 with delicate serrations is observed. 



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

 .segments 24 — 25 are fairh- well separated ; "^sthetasken" are 

 found in .segments 8^9, 12, 14 and ig; 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 i-2 as long as segments 8^9 



Text-fig. 62. Scaphocalan,. .alnius Farr. fC. ^^^^ ^^^ ^^.,^j^j^ ^^^ ^j ^j^^^^^^ ^^^^^j length; segment l6 is 1-2 



■A. Head X 33- h. Rostnitu from the right X 59. 



c. Genital somite X 33- d. Pe.s 1 1 sin. in anterior as long as 15. The third basipodite of the viandibulac seems 



view X59. e. Pes III sin. X 59- f- St. pes II ^^ j^^^,^ ^^^j^^ ^ ^^^^^ mediallv; in Other respects the mandi- 



sin. X 150. ' ' ^ 



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



species. The iiitixilluLae 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 Ri II ~ III 5 and the Re has 9 setae. The incixillar 



and iiiaxillipcds are scarcel\' different from Farran's description. 



The firs f 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 F"arran's fig. 16 PI. V; the vSe 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 fhird 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, whicli is smooth; in other respects 



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



