COPEPODA. 9 



1. Calanus propinquus. 

 (Plate L, figs. 1, 2, 3, 3^ 4.) 



Calanus propinquus, Brady, Rep. ' Challenger ' XIX., Copepoda (1883), p. 34. 

 ,, Giesbrechfc, Fauna u. Fl. Neap. XIX. (1892), p. 91. 



„ Giesbrecht und Schmeil, Das Tierreich, 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. 



Second feet He 3 divided into proximal portion 24 ; distal 25. 

 Third „ „ „ 20; „ 23. 



Fourth „ „ „ 36: „ 20. 



Hi 3 with seven bristles, end 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. 

 finmarchicus, 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. 



