194 COPEPODA 



"/ 7 1904 St. 183 6i30 L. N. I7o8 L,. W. Yt. 1800 M. Wire. 

 '5/6 1905 St. 82 5ioo L. N. n43 L. W. Yt. 1200 M. Wire. 



Distribution. This species has been found at a single station in the Polar basin at about 

 84* L. N. and 90 L. E. In the sea between Spitzbergen and Greenland the Due d'Or leans has between 

 I2 / 7 and 5/g gathered it at 4 stations, and sometimes in considerable numbers, males as well as 

 young ones, f. inst. at St. 43 78i3 L. N. i63i L,. W. 310475 meters depth; the three other localities 

 were at 7939 L. N. 24o L,. E. 12001800 Meters depth, at 78O5 L,. N. 5^21 L. W. 500^1350 M. depth, 

 and 7i22 L,. N. i858 L,. W. It has once been recorded from the Norwegian Sea in a depth of about 

 400 M., and from the west coast of Ireland at a depth lying between 280 and 680 fathoms, and always 

 rather scarce. 



Remarks. Though the males and the female were found at widely separated localities, I am 

 fairly convinced that they belong to the same species, and without doubt to S. brevicornis. As the male 

 described by Scott is only 1-5 mm., and as the fifth pair of legs seems to differ in several respects, 

 I am not convinced that it ought to be referred to this species. 



I am fairly convinced that Farran's species S. gracilipes, which was established with due 

 reservation especially on account of "the more distal position occupied by the outer-edge tooth of the 

 second joint of the fifth foot," is identical with this. Farran has (p. 53) found a rudimentary endopodite, 

 like that observed in specimens of X magnus (cf. p. 191) in a specimen of his Scolecithrix gracilipes as 

 well as of his 5! valida, which he regards as an anormality. In this, as well as in his opinion of 

 Giesbrecht's genus Racovitzanus, I agree with him (cf. Wolf end en 1911 p. 259). 



61. Scaphocalanus obtusifrons G. O. Sars. 

 (PI. VII figs ga-d; PI. VIII figs 8 a e; text-figs 60 a c and 61 a d). 



1905. Amallophora obtusifrons n. sp. G. O. Sars, p. 22. : 1908. Scolecithrix obtusifrons G. O. Sars. v. Bremen, p. 25, fig. 87. 



1905. Scolecithrix einarginata n. sp. Farran, pp. 3637, pi. VII 1909- Scolecithricella obtusifrons G. O. Sars. A. Scott, p. 92, pi. 



figs 6- 17. XXXI figs 1-9. 



1906. Amallophora obtusifrons G. O. Sars. Pearson, p. 17. 1911? Scolecithrix sequalis n. sp. Wolfenden, pp. 255 256, text- 

 1906? Scolecithrix inornata n. sp. Esterly, p. 67, pis 9, n and 13. fig. 33. 

 1908. Scolecithrix obtusifrons G. O. Sars. Farran, p. 54. 



Description, f .. Size of specimen from Thor St 72 was 4-4 mm.; anterior division 3-55; uro- 

 some 0-85 mm. Sars' specimens measured 5-6 mm., Farran's 4-3111111. and Scott's 4-5111111. 



The shape of the body etc. is scarcely different from Farran's description; each filament of 

 the rostrum is as stated by Sars and Scott terminally bifurcate (text-fig. 593). The genital somite 

 is slightly produced below, and has a well developed curved receptaculum (PI. VIII fig. 8 a). 



The anfennuies, which extend a little beyond the end of the furca, are in measurement almost 

 exactly like Farran's figures; the segments 24 and 25 are fairly well separated, the proximal seta is 

 wanting in segm. 10 as well as in 17, and the Sp. of segment 24, which is placed near the tip, extends only 

 slightly beyond the end of segment 25. The exopodite is distinctly longer than the endopodite of the 

 antennae, and this has 7 setae in the Li of the second segment and 5 setae in the Le. The inaudi- 

 bulae are scarcely different from those of S. magnus. The maxillulac are like Farran's figure, with 8 

 setae in the exopodite and 7 long setae and a shorter more delicate one in L,e. The maxillae have the 



