. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. i6 COPEPODA in pes IV no secretory pore corresponding to Se i Re III was seen and in Re II f^ III pes V only a single pore is found at the base of Se 3. The labrnm shows in lateral view complete similarity to Sars' figure pi. I but has the anterior process less prominent than in most f-$ examined by me. Y. (St. IV). Size: Varying from 2 (63° 43 L. N. 0-26 L. E.), (r8 + o-6) = 2-4. (South West of Iceland), 26 (Davis Strait), 2-8 mm. (64° 56 L. N. 36" 19 L. W.) to 2-9 mm. (Jan Mayeu). Gran's specimens (-^ urosome) varied
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. i6 COPEPODA in pes IV no secretory pore corresponding to Se i Re III was seen and in Re II f^ III pes V only a single pore is found at the base of Se 3. The labrnm shows in lateral view complete similarity to Sars' figure pi. I but has the anterior process less prominent than in most f-$ examined by me. Y. (St. IV). Size: Varying from 2 (63° 43 L. N. 0-26 L. E.), (r8 + o-6) = 2-4. (South West of Iceland), 26 (Davis Strait), 2-8 mm. (64° 56 L. N. 36" 19 L. W.) to 2-9 mm. (Jan Mayeu). Gran's specimens (-^ urosome) varied from 1-4—1-83 and specimens from due d' Orleans from 2—3-5 mm. This stage is easily distinguished by 3 abdominal somites, of which the third one is the longest, being 1,3 as long as the second one, and 2'6 as long as the first one. The number of setae in the furca is scarcely different. The antennulae (with 25 segments) and mouth-appendages (including. Textfigure 3. Cal. finmarchictis G. 9- (Stage III), a. Head from the right. X 85. b. Abdomen from the left. X ^S- c. Pes II dext. Re in post. view. X no. d. Pes III sin. in anterior view. X no. e Pes IV sin. in anterior \aew. X no. f. Pes V sin. in lateral view. X 150. the labrum, exteriorly as well as in oral view) except the L,e of the maxillulae, which only possess 9 setae, are scarcely different from f$. Pes I has the Ri II —III fused and an indistinct articular mem- brane between Ri I and II; the Re II—III are also fused but in other respects this appendage is scarcely different. Pes II—III have the same segments fused, the Se Ri II is missing, but Ri has 10 setae as usual; the Re II c\; III have only 5 Si. The pes IV differs from the preceding pair by 8 setae only of Ri (textfig. 2 b). The pes V is more clumsy than in stage V with undivided Ri with 6 setae and undivided Re with 4 Si and 3 Se. The inner margin of basipodite II has 3 teeth (textfig. 2 c). Secretory pores are in pes II—IV wanting in Re III, corre
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