'COPEPODA 



15 



antennae have the endopodite at least as long as the exopodite, and it extends beyond the Re VI; the 

 setae are better developed; the Re II has in the middle inwards a rudimentary tooth (for a Si). The 

 mandibulae have as seen in fig. 1 e a fairly well developed but soft-skinned manducatory part with a few 

 rudimentary teeth. The viaxillulac (fig. ih) have 7 plumous setae, of which the 2 proximal are some- 

 what shorter in Lei; the Li 1, which is fairly well developed but soft-skinned, possesses a number of 

 soft setae, of which some, though more or less swollen at the base, have not yet lost ther original 

 shape, while others are represented by short eminences; the Li 2 seems to be represented by a short, 

 somewhat ringed eminence without setae; the Li 3 (?) has a single setae; the basipod 3 + the Ri pos- 

 sess 4 plumous setae. The Re has 11 setae. The maxillae form a ringed, elongate, soft-skinned organ, 

 which bears slender setae along its inner concave margin. The maxillipes is longer and more slender 

 than in the female ; the second basipodite has setae only on the Lobe IV, namely a strong plumous one 

 and a shorter one in addition to a sensory lobe. The pes I differs from that of the female by the almost 

 straight margin (fig. if); the St. of Re III of pes II has 37 teeth. The inner margin of the second 

 basipodite in the fotorth pair of legs is only sligthly convex, without setae or teeth. 



The pes V (text-fig. 29 d) provides great similarity to that of Gaetanus, but is nevertheless 

 distinctly different (PI. IV fig. 1 g). The Ri dext. is long and somewhat enlarged towards the end, where, 

 inside, it bears two short delicate setae. The Re I <n> II (?) of the right leg is fairly long and slender. The 

 Re III (?) is somewhat enlarged inwards, and then rather suddenly attenuated ; exteriorly, at the base 

 of the terminal part, which distally has an inner membrane and has the pointed tip curved 

 outwards, a slender Se is placed; the distal part is at least 1-5 as long as the proximal. The Ri sin. 

 is fairly long and slender; the Re III of left leg, at the base of which a tuft of hair is found, is short, 

 almost fused with preceding segment and produced into a hairy spine-shaped protuberance. 



The structure of the oral surroundings is in the main like that of the female (cf. fig. ie); the 

 labrum proper, which partly overlaps the chitinous bed in which the manducatory part of the man- 

 dibulae is placed, is well developed, but appears, but for a terminal tooth, to be smooth outside as well 

 as inside. The labial lobes, which consist of soft ringed chitin, are just indicated, and do not possess 

 any hairs. The lamina labialis etc. are completely wanting. This structure corresponds well with the 

 rudimentary state of the masticatory part of the maxillulae, not being adopted for predatory purposes, 

 nor even for taking any nourishment at all. 



Y^ (St. V). Size of female from Ingolf St. 47: 3-06 mm.; anterior division 2*44 ; • urosome 0-62 

 mm. A young male measured 2 - i4- 



The limitation between the head and first thoracic somite is generally better marked than in 



the adult female (text-figs 29! — j). The first one of the four abdominal somites is ventrally produced 



in the female, barely so in the male (text-fig. 29 e). The appendages show the usual differences from 



those of the adult females; the St. of Re III pes II has 14 teeth; an interesting difference is found 



in the wanting glandular pore at the base of Se I Re III; the second basipodite of the fourth pair of 



legs is smooth, while 7 short hairs are found in the females, corresponding to the spines of the adult 



females. The fifth pair of legs is as seen in text-fig. 29 f rather clumsy and quite unlike Cleve's 



fig. 3 PI. II; the Re dext, which is longer than the Ri dext., and which has a strong terminal spine, 



is distinctly longer than the Re sin. 



15* 



