COPEPODA 195 



exterior margin distinctly produced, and have, in addition to powerful vermiform sensory appendages, 

 at least 5 amalliform or brush-shaped ones. The maxillipeds are like those of S. magnus, and have, 

 in contrast to Far rail's, a sensory seta in the middle of the second basipodite. 



The. first pair of legs has, as stated by Far ran (fig. 14 PI. VII), a well developed Se in Re I, 

 attaining the middle of Re II. The second pair of legs is in main features like Farran's fig. 15 (cf. text- 

 fig. 60 b), but the outer marginal tooth of the second basipodite is well developed, and the inner margin 

 is near the tip produced into a short curved tooth; the arrangement of the spines on the posterior surface 

 differs only in minor details, f. inst. by the presence of spines in Re I, but in addition to the spines 

 areas of short teeth were found on the posterior surface of the exopodite; the anterior surface seems 

 to be smooth; the first inner segment has a well developed Se; the St of the third outer segment has 

 about 70 partly fused teeth (fig. 9 a) without the characteristic basal fenestra. Glandular pores seem 

 to be present in Re II and III. The third pair of legs has the inner margin of the second basipodite, 

 a little proximally to the Si, produced into a longer or shorter, generally broken, styliform process, 

 corresponding to that of the second pair of legs; this process is beset inwards as well as terminally by 

 the most distally placed marginal bristles, and in this way 

 forms a prolongation of the inner margin proper; the 

 third basipodite is anteriorly and terminally produced into 

 a distinct slender spine medial to the insertion of the endo- 

 podite (text-fig. 60 c), like that of Scottoca laities. On the anterior 

 surface of the third feet, except in the third outer segments, 

 a delicate spinulation is found; the spinulation of the 



posterior surface is like Farran's description, but a basal Text-fig. 60. Sca^hocalanus obtusifrons G. O. Sars f<?. 



a. Head X 33- b. Pes II sin in ant. view X 58. 

 group is found in the third outer segment. The fourth c. Pes IV sin in ant. view x 58. 



pair of legs (text-fig. 60 c) has the second basipodite very 



clumsy without marginal bristles, and is suddenly restricted near the tip; on the posterior surface trans- 

 versely placed short spines were observed in Ri II, and in a less degree in Ri III, but the anterior 

 surface is covered all over with areas of more or less delicate teeth; the serrations of the terminal 

 setae are more or less fused in the middle ; a glandular pore is observed not only in Re II and III, 

 but in Re I as well. The fifth pair of legs has the exopodite divided into a short basal and a longer, 

 somewhat enlarged outer segment, possessing a shorter terminal and a longer more proximal seta. 



The anterior portion of the labriim proper is distinctly more produced in front than seen in 

 fig. 8 a of 5. magnus; the arrangement of the setae is, as seen in fig. 9 b, rather characteristic; the an- 

 terior curved group of long delicate setae is posteriorly on each side divided into an outer and inner 

 portion; in the middle an anteriorly convex row is found; for further details I refer to the figure. 

 The oral surface of the labrum (PI. VII fig. 9 e) shows a rather characteristic structure, bearing most 

 resemblance to that of Scottocalanus; the first oblique group of the longitudinal series is smaller than 

 in S. magnus, and it is followed by two or three more or less fused groups of fairly long setae, between, 

 which the transverse median rows are placed, behind the mentioned groups an oblique one of more 

 slender hairs, corresponding to the square one of X magnus is found. Laterally, in front, two groups oi 

 delicate hairs are found. No distinct lamina lahialis was observed; in front of the serrula 6-dentata at} 



?5* 



