112 



COPEPODA 



The measurements and appendages differ scarcely from those of G. Kruppi. The antennae are 

 like those of G. Kmppi, but the two branches are almost of same length. The mandibulae, maxillulae 

 and maxillae are scarcely different from those of G. Kruppi. The third segment of the maxillipeds is 

 i-2 as long as the first and second combined, and 27 as long as the endopodite, but in other respects 

 this pair of appendages is scarcely different from those of G. Kruppi. 



The first pair of legs is like that of Gaidius brevispinus (PI. Ill fig. 1 g), but the articular line 

 between Re I— II is indicated anteriorly, though wanting posteriorly; the Se of Re I and II are wanting. 

 The Se of Ri I of the pes II is wanting; the St, which has about 30 teeth, is a little longer than Re 

 III, which is again a little longer than the Re I— II; no glandular pore is found at the base of Se 

 Re I. The pes III— IV have a secretory pore at the base of Se Re I; the basipodite of the third pah- 

 has a marginal row of setae, but that of the fourth pair is completely smooth. The fifth pair of legs 

 (text-fig. 28b) is in most features like that of Gael. Kruppi (PI. Ill fig. 3d); the right leg is 



less slender, especially the third basipodite, which 

 is, however, less clumsy than in G. brevispinus (PI. 

 Ill fig. 1 h); the first segment of the right exopodite 

 has exteriorly a slight concavity almost in the 

 middle and, proximally to it, a slender seta (Se Re I), 

 thus indicating that this segment really corresponds 

 to Re IcnjII; the Re III differs from that of G. 

 Kruppi by the structure of the terminal portion 

 (that distal to inner process) which is only two thirds 

 as long as the basal part and not in the least as long 

 as, and, proximally to a hair-shaped terminal part, has 

 an inner lamina in the distal half. The right endopo- 

 dite when observed from behind, is almost completely 

 like that of G. Kruppi (fig. 3 d), but viewed anteriorly it is seen to have a very characteristic form on 

 account of a wide deep "cavity"? and a terminal tooth not unlike a Prussian helmet, but with a prolon- 

 gation towards the base, as if to give protection to the back of the neck. The pes V sin has the Ri 

 of a similar shape as in G. Kruppi, but it is comparatively shorter, reaching only slightly beyond the 

 middle of Re I, and has the segmentation more indistinct; the first segment of the exopodite has the 

 outer margin somewhat convex, and is terminally somewhat produced inwards; the Re III, which is 

 scarcely ri as long as Re II, has a fairly long terminal spine, near the base of which a delicate 

 seta is observed, as well as some hairy spots. 



Remarks etc. Of this species I have only examined a single male, brought home by the S/S 

 Thor, and taken 8 / 6 1905 57°52 I* N. 9^53 Iy. W. Yt. 1500 M. Wire. 



As except in the shape of the forehead it is in almost all characters like the male of G. 

 Kruppi, I think it is rightly referred to Gaetanus. It is certainly not the male of any of the species 

 of Gaetanus which has been mentioned in this paper; nothing indicates that it is the male of any 

 of the described species of Gaidius or Gaetanus. 



Text-fig. 28. Gaetanus ferox n. sp. 



a. Head from the left X c. 40. 



b. Abdomen X c. 40. 





