COPEPODA 



139 



fc?. Size of specimen from Thor St. 183 was 5-35 mm.; anterior 4-08 mm.; urosome 1-27. 



The rostrum and the frontal keel are scarcely different from those of the adult female. The 

 body is more slender, and the lateral corners are rounded and symmetrical. The abdomen is scarcely 

 different from that of the two preceding species. The antennulae extend about to the end of the third 

 abdominal somite, and are also in other respects similar to those of the preceding species. The antennae 

 are practically like those of the female, but in the Re I a small conical process was observed medially, 

 apparently bearing a delicate seta. The manducatory portion of the mandibulae possesses posteriorly 

 one or two rudimentary teeth. The maxillulae have short soft appendages in Li i 2; the I/e has 2 

 short and 6 long setae, and the 10 setae of the Re are as usual in the male not shortest in the 

 middle; the L,i 3 has 3 setae, and the Basp. as well as Ri have a similar number of setae as in the fe- 

 male, but they are softer. The maxillae and maxillipeds are scarcely different from those of the preceding 

 species. The first pair of legs has as usual a well developed 

 articulation between Re I II, and the Se Re II is compara- 

 tively short; the pes II IV are scarcely different from those 

 of the females. 



The right leg of the fifth pair has the basal seg- 

 ments like those of the preceding species (cf. fig. 3 b PI. V). 

 The right endopodite is in general shape very much like 

 that of U. minor (figs 9 a b PI. IV, cf. fig. 3 e PI. V); it is 

 terminally somewhat curved and has here lamellar margins, 

 turned over to establish a gutter-shaped excavation facing 

 forwards and outwards. Outwards and backwards a well 

 developed conical tooth is found near the base, and beyond 

 this, removed one third of the length of the segment from 

 the base, another striated tooth or elevation is found, which 

 really forms the middle of the marginal, here scarcely 

 indicated, keel present in the two other species; the anterior 



Text-fig. 37. Undeuch&te superba n. sp. 



a. f9. Head X c. 30. b. ff. Abdomen X 9- 



c. fQ. Pes II Ri I sin in ant. view X 150. d. f9- 



Pes IV basipod. II in post, view X 15. e. yd" 



(St V). Pes V ant view X 33- Yd 1 (St IV). Pes V 



ant view X 59- 



surface of the endopodite is distinctly striated. The first segment of the right exopodite (figs 6 a b) 

 is basally and in front produced into a wing-like expansion bearing three serrations, which are followed 

 by a low keel and, somewhat more distally, a well developed tooth, where in the typical specimen a 

 soft-skinned parasite, divided into three globules as seen in figs, is fastened ; the second segment, which 

 is almost completely fused with the first, has distinct marginal lamelli-form expansions ; the third seg- 

 ment is elongated, somewhat attenuated and includes a gutter-shaped excavation facing inwards. 



The basal segments of the left leg are in main features like those of the preceding species; 

 the left endopodite, which extends distinctly beyond the middle of Re I, is elongate and attenuated 

 with undulated margin; the first segment of the exopodite is less robust and somewhat shorter than 

 the third basipodite, and somewhat convex; the second segment is short, about 1-5 as long as the 

 strong curved tooth, which has a distinct accessory tooth; the third segment is similar to that of the 

 preceding species, but the terminal spine is distinctly articulated. 



18* 



