196 



COPEPODA 



inner and an outer longitudinal series were found (PI. VII fig. gd); the arrangement of hairs Ijetween 

 and behind the serrulae was not studied in details. In the middle, between the labial lobes, a large 

 median o-roup of setae was found, which on each lobe is continued into two lateral series placed 

 closely to each other; more laterally, well separated from this system, a lateral row of shorter setae, 

 starting from a basal group, was observed. 



The intestinal tract is anteriorly produced into a rather slender rostral coecal sac; posteriorly 

 the wide stomach is attenuated, and is, somewhat in front of the abdomen, continued through a slight 

 curvature into the straight intestine proper. 



f<^. Size of specimen from Thor St. 180 was 3-84 mm.; anterior division 2-65; urosome 1-19 mm. 



The body is somewhat more slender than in the female, with rounded lateral corners of the 



well marked short fifth somite; the rostral filaments are scarcely different. The /^wi-WA/r is almost half 



as long as the anterior division, and the comparative 

 length of its .somites is 23, 40, 34, 44 and 4 (PI. VIII 

 fig. Be). 



The aiifeniiu/ac scarcely extend to the end of 

 the furca; the number of free segments is scarcely 

 different from that found in S. ii/agiiiis\ but the seg- 

 ments 13 and 15 are partly fused with the preceding- 

 ones, as the articular line is wanting behind; the 

 measurements and the appendages are ver\' much 

 like those of S. globiceps. The antciinoc and iiiondi- 

 biilac are scarcely different from those of X magims. 

 The Diaxillulae are fairly well developed; the Le 

 possesses 9 setae; the Li I has at least 8 rather 

 delicate setae, the Li II has 2 setae and the Li III has 4 setae; the third basipodite lias 4 setae; and 

 the Ri 2 + 5 setae; the exopodite has as in the female 8 setae. The maxillae are fairly developed, 

 with 4 setae in each of the four proximal lobes; the lobe V has one spine somewhat stronger than 

 the corresponding one of the lobe IV; the endopodite has 6 soft sensory setae, but not amalliform ones, 

 the maxillipcds are like those of the male of S. viagniis^ but no setae were observed in the middle of 

 the second basipodite. 



The natatory legs show in all features of interest complete similarity to those of the female. 

 T\ie. Ji/th pair of legs is verj' characteristic, as seen in text-fig. 61 a; on the right side (PI. VIII 

 fig. 8 c) we have a long and slender first basal segment, followed by a well enlarged second segment. 

 The right endopodite (text-fig. 61 b) is. rather short, somewhat clavate, and has a slender, delicate seta 

 almost half as long as the segment; the right exopodite consists of three long slender one.s, of which the 

 first is much the longer and thicker, while the third, somewhat plate-shaped one, is the shortest and 

 most slender (text-fig. 61 c). The two basal segments on the left side are, like those of S. magnits, long 

 and slender; the left exopodite has 3 segments (text-fig. 61 d), of which the third one, which is much 

 the shortest, is distinctly attenuated, with a terminal seta; the left endopodite is long and slender 

 and extends distinctly beyond the end of the exopodite. 



Text-fig. 61. Scaphocalamis obhisifrons G. O. Sars fd"- 

 Pes V X 58. b. Pes V dext. Ri X 150. c. Pes V 

 dext. Re III X 150- d. Pes V sin. Ri X i5o. 



