COPEPODA 145 



Distribution. According to Far ran "this species is of frequent occurrence in the N. E. Atlantic, 

 having been taken on every station at depths of from 300 to 1000 fathoms". It has been recorded 

 from the Fseroe channel, from the Mid Atlantic and from the South Atlantic as far south as 35 L. S. 

 It has been recorded from the Gulf of California, from the Pacific 35 L. N. 125 L. W. as well as from 

 the Malay Archipelago. 



Remarks. In spite of the small differences enumerated between my specimens and Giesbrecht's 

 description I think the Atlantic and the Pacific forms belong to the same species. Different authors, f. 

 inst. Pearson and A. Scott, have identified Wolfenden's Euch. carinata with this species; they are 

 certainly wrong as far as the young male described in 1902 is concerned; on account of the frontal crest 

 like that of E. galeata, the rounded lateral corners of the thorax and the left endopodite of the fifth 

 pair of legs "like small stump" there is some reason to identify it with, f. inst, Euchirella intermedia 

 (cf. p. 127). The position of the adult female is somewhat uncertain; Wolfenden regards it (p. 236) as a 

 true Euchirella in spite of the missing spines of the second basipodite of the fourth pair of legs. It 

 is with some reluctance that I have referred the described male to this species; at present it is impos- 

 sible to tell its certain position. The descriptions of Esterly and Scott are too short for a certain 

 identification. 



41. Chirudina pustulifera G. O. Sars. 

 (PL V figs 6 a d; text-fig. 39.) 



1905. Undeuchaete pustulifera n. sp. G. O. Sars, p. 14. 



1908. Euchirella Wolfendenii n. sp. Farran, pp. 38 39; pi. II figs 1819; P^- IV fig. 3. 



1908. Undeuchaete pustulifera G. O. Sars. v. Bremen, p. 44. 



Description. Size of female from Thor St. 183 was 6-9 mm.; anterior division 57mm.; urosome 

 1-2 mm. Sars' specimens measured 6-9 and Farran's 7-2 mm. 



The head has no frontal crest, but a strong, slightly curved rostrum (text-fig. 39). The fifth 

 somite is well limited in front, and the lateral corners are rounded (figs 6 a b). The genital somite 

 has a very characteristic shape (figs. 6 a b); on the left a low protuberance is found, 

 and on the right side a very prominent one, consisting of a basal larger portion 

 and a terminal regularly rounded part. The genital somite, seen from the side, has 

 a strong, rounded, rather prominent protuberance in front, and a lower one in 

 the middle as well as behind; observed from below the genital area (fig. 6 c) is like Text-fig. 39. Chirudina 



that of Ch. Streetsii. The abdomen is almost everywhere hairy, but the setae are P*IW G. O. Sars. 



f 9. Head X c. 18. 

 longest and best developed dorsally along the hinder margin of somites II IV. 



Dorsally in the genital somite as well as ventrally in the third and fourth ones tufts of shorter and 

 longer hairs are observed. The caudal rami are about as long as wide, and the Si is scarcely half as 

 long as the St., which is about as long as the abdomen. 



The antennulae extend to the end of the abdomen. The antennae are scarcely different from 

 Farran's fig. 18 PI. XI, except by the presence of a fairly long terminal seta in Re 2; the Re is about 

 17 as long as Ri. The mandibulac are scarcely different from those of C. abyssalis n. sp. (cf. fig. 5b); 

 the third basipodite is not smooth as indicated by Farran, but has 3 setae. The maxilhilac have 5 

 powerful setae in Li 2, have 4 -f- a conical process in Li 3, and 5 in the Basp. 3; the Ri I III pos- 



The Ingolf-Kxpedition. III. 4. 19 



