COPEPODA. 
9 
1. Calanus propinquus. 
(Plate I., figs. 1, 2, 3, 3 a , 4.) ^ 
Calanus propinquus, Brady, Rep. * Challenger ’ XIX., Copepoda (1883), p. 34. 
., Giesbreckt, Fauna u. FI. Neap. XIX. (1892), p. 91. 
,, Giesbreckt und Sckmeil, Das Tierreick, Copepoda (1898), p. 15. 
„ Giesbrecht, ‘ Belgica ’ Report, p. 16. 
„ T. Scott, Trans. Linn. Soc. VI. (1893), p. 25. 
The length of this copepod given by Brady is 5 * 5 mm., by Giesbrecht 4 • 9-5'3 mm. 
The majority of the ‘ Discovery ’ and ‘ Gauss ’ specimens measure under 5 mm. The 
cephalothorax is rather over three times as long as the abdomen, furcal segments twice 
as long as broad. Head evenly rounded, without any trace of crest. Head separate 
from first thoracic segment. Last thoracic segment laterally produced a little, and 
ending in short points. Anterior antennae not reaching beyond the furca (thus shorter 
than described by Giesbrecht, in these specimens). Relative proportions of 24th to 25th 
segments as 18 : 21. 
O 
■’Jc 
Second feet Re 3 divided into proximal portion 24 ; distal 25. 
Third „ „ „ 20; ,, 23. 
Fourth ,, „ ,, 36 : ,, 20. 
Ri 3 with seven bristles, en-d saw two-thirds the length of Re 3. Fifth feet, B 1 
with inner margin convex below, concave distally, with thirteen or fourteen teeth, and 
distally with three teeth, larger than the others. Ri 3 with five bristles, two outer, 
two apical, one inner. This animal is much more robust than the next species 
( simillimus ). 
The $ is about the same size as the 9, and the chief differences consist in the 
structure of the fifth feet and shape of the head and thorax. The latter is very like C. 
fimnarchicus , the head oval, rounded, and produced, the first thoracic segment with deep 
indentation between it and the second, and its posterior margin protruded. The 
anterior antennae with the basal joints much coalesced. Posterior footjaw with a long, 
stout, densely-feathered dorsal bristle. Fifth left foot much prolonged, Re 1 and 2 
elongated, Re 3 very short and pyriform shape, with short distal bristle. Ri only half 
the length of Re, with respectively 1:1:6 short weak bristles. Right foot Ri nearly 
as long as Re, with 1:1:6 bristles. Re not much more than half as long as Re of 
opposite side. First basal with inner margin armed with seventeen to twenty large 
teeth; in its upper part slightly concave, in its lower part slightly convex, the teeth 
all of pretty much the same size. 
