COPEPODA 17 



The body appears more slender than in the preceding stage ; the urosome consists of 2 somites ; 

 the Se of furcal rami is missing (textfig. 3 a b). The antennulae, which consist of 23 segments, 

 extend 3 segments beyond the tip of the abdomen. The antennae and other mouthlimbs except the 

 maxillulae, in which the Le has 8 setae and the Re 8, are scarcely different. The lateral outline of 

 the labrum is as shown in textfig. 3 a alike stage V, but the frontal protuberance is less prominent. 

 The oral surfaces of the labrum and the labium are in their main structures alike f$. 



Pes I = St. IV. Pes II in main features alike St. IV, but Ri with 8 setae and Re II oj m, 

 which is less slender, with 4 Si only (textfig. 3 c). Pes III is comparatively shorter than II, and the 

 Re II 03 III has only 2 Se (fig. 3 d). The pes IV (fig. 3 e) has no seta in basipodite II, 7 setae in 

 unsegmented Ri and 3 Si -f- 3 rather short Se in Re. The pes V (fig. 3 f) is represented by a wide 

 indistinctly divided basal part, which is distally attenuated, and here subdivided into longer outer 

 branch with at least 3 setae decreasing outwards and a shorter inner branch with 2 fairly long setae. 

 Secretory pores were with certainty only observed at the base of Se 3 Re II os III in pes II III. 



Textfigure 4. Cal. finmarchicus G. 9. (Stage II). 

 a. In lateral view X 85. b. Pes IV X 225. 



Y. (St. II). Size: Varying from 0-9 (S. W. Iceland), n (Davis Strait), 1-3 (i -(- 0-3) (Jan Mayen) 

 - 1-6 mm. (Jan Mayen). Gran's specimens (-f- urosome) of his stage V varied from 078 roi and 

 specimens from due d'Orleans from 1-4 1-8 mm. 



The body is more slender than in the preceding stage (textfig. 4 a). The head is sometimes 

 indistinctly separated from the first thoracic tergite, in addition to which 3 somites are found, of which 

 the last one only bears a rudimentary pair of legs. The antennulae, which reach about one segment 

 beyond the tip of the furca, consist of 18 segments only, as the segments proximal to the n are more 

 or less fused. The antennae and mandibulae are practically alike those of the f$. The number of setae of 

 the maxillulae is comparatively small; Le has only 6 setae, Li I has only 10 spines, basipodite III 

 has 3, Ri I i, Ri II 2, Ri III 5 and Re 7 setae. The maxillae are in the main features alike the f$. 

 The maxillipeds are in shape alike the preceding stages, but the Basp. Ill has in the middle only 

 2 Si, as the basal one is wanting, Ri I has a single seta, Ri II (probably Ri 11^ III) is rather elongate 



The Ingolf-Expedition. III. 4. 



