STAGES IN THE LIFE HISTORY OF CALANUS FINMARCHICUS. 15 
Appendage XI. 5rxa Swiumrine Foor 2-lobed, each lobe with 2 hooks. 
Stace IV (Plate 4, Figs. 4 and 8). Very like III. Thorax with 5 free 
segments each with a well-developed swimming foot. Urosome of 3 
segments. 
Appendage I. ANTENNULE with 23 segments. 
Appendage II. Antenna like I, but with 7 bristles on the inner lobe 
of the endopodite. Very like the adult. 
Appendage III. Manprste like I-III. 
Appendage IV. Maxiuuute like I-III, but the epipodite is larger with 
9 bristles now like the adult, the Ist inner lobe of the basipodite has 3 
bristles like the adult, endopodite with 5 bristles at the end. 
Appendage V. Maxitta like the adult. 
Appendage VI. Maxi.uirep (Plate 5, Fig. 10). 
Endopodite of 4 segments, 1st with 4 bristles, 2 with 2, 3 with 2 inside 
and one outside, terminal segment with 4 bristles. 
Appendage VII. Ist Swrmmine Foor (Plate 5, Fig. 11). The proxi- 
mal joint of the basipodite with an inside bristle. 
Endopodite with 2 segments, the proximal segment with an inside 
bristle, the distal segment with 3 inside bristles, 2 terminal bristles, and 
one outside bristle. 
Ezxopodite with 2 segments, the proximal segment with an inside bristle 
and an outside thorn, the distal segment with 4 bristles inside, a terminal 
blade, and 3 thorns outside. 
Appendage VIII. 2np Swimmine Foor (Plate 5, Fig. 12). 
The proximal segment of the basipodite with an inside bristle, the distal 
segment with an outside thorn. 
Endopodite with 2 segments, the proximal segment with one bristle 
inside, the distal segment with 5 bristles inside, 2 terminal bristles, and 
2 bristles outside. 
Exopodite with 2 segments, the proximal segment with one bristle inside 
and a thorn outside, the distal segment with 5 bristles inside, a terminal 
blade, and 3 thorns outside. 
Appendage IX. 3rp Swimuine Foot (Plate 5, Fig. 13). The proximal 
segment of the basipodite with a bristle inside, the distal segment with a 
thorn outside. 
Endopodite with 2 segments, the proximal segment with one bristle 
inside, the distal segment with 4 bristles inside, 2 terminal bristles, and 
2 bristles outside. 
