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, corresponding to Se i - 2, but found at Se Re II 

 and at Se 3 Re III; in pes V secretory pores are found at base of Se Re I and Se 3. 



Y. (St. III). Size: Varying from 1-4 (Davis Strait), 17 (1-3 + 0-4) (63° L. N. 15° \,. W.) — 2-4 mm. 

 (Davis Strait). Gran's specimens (-=- urosome) of his stage IV varied from 1-05 — 1-44 and specimens 

 from due d' Orleans 2 — 2-2 mm. 



