108 COPEPODA 



podite of the fourth pair of legs possesses 15 strong knife-shaped spines (PI. Ill fig. 7 b). The glan- 

 dular pore at the base of Se Re I is wanting in the second pair of legs but found in pes III IV. 



The oral surface of the labrum is in the main like that of G. pilcatus (cf. fig. 6 a PI. Ill) ; 

 the first group in the longitudinal series consists of numerous short setae (23 setae deep), and 

 the second of somewhat longer ones; in the third group only a single row of fairly long spines 

 were observed, and in the third one a few very short ones were observed laterally in addition to the 

 inner row of long knife-shaped spines (cf. fig. 5 d). The lamina labialis is smooth as in G. Kruppi, 

 but the area in front of and behind it is like that of G. latifrons. 



Y$ (St. V). Size of female from St. 88 3-34 mm.; anterior division 276 nun., urosome 0-58. 



The relative length of abdominal somites and furcal ramus, which is ri as long as wide, is 

 15, 13, 9, 12 and n. The measurements of the antennulae are more like those of the G. miles, as 

 segment 22 is a little longer than 19, and as segments 8 cvs 9, 13 and 24 <^ 25 are of almost equal length. 

 In other respects of any importance the appendages are scarcely different from those of the adults, 

 except by the structure of the second basipodite in the fourth pair of legs, which is smooth and has 

 the inner margin almost straight, not suddenly produced as seen in fig. 7 b. 



Occurrence. The Ingolf Expedition has not taken this species, but the Thor has gathered a 

 few specimens at four stations viz. 



"/ 7 1904. St. 183. 6r30 L. N. I7o8 L. W. Yt. 1800 M. Wire i f ?. 



IO / 7 1904. St 180. 6i34 L. N. I9O5 L. W. Yt. 400 M. Wire i f ?. 



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



2 % 1905. St 88. 4809 L. N. 83O L. W. Yt 300 M. Wire i y$. 



Distribution. This species has previously been recorded from the west coast of Ireland, from 

 the area explored by the Monaco Expedition, from the South Atlantic between 20 and 40 L,. S., from 

 the Malay Archipelagos and from the Pacific (3 L. S. 5 L. N. 99 115 L. W.). 



Remarks. I am not quite sure that the specimens which I have examined really are iden- 

 tical with Giesbrecht's G. miles, which is smaller, has the relative measurements of the anten- 

 nulae somewhat different, the lamina of the second basipodite of the maxillipeds quite differently 

 shaped and only 5 instead of 15 spines marginally in the second basipodite of the fourth pair of legs. 

 Scott's specimens agree with mine in the number of the mentioned spines, in the size and partly in 

 the shape of the lamina of the maxillipeds, but differ in the measurements of the antennulae. As 

 Scott's specimens form a connecting link between Giesbrecht's and the Atlantic specimens, I do 

 not think the establishment of a new species is warranted. 



29. Gaetanus latifrons G. O. Sars. 

 (PI. Ill figs 5 a g; text-figs 27 a e). 



1905. Gaetanus latifrons n. sp. G. O. Sars, p. II. 



1905. holti n. sp. Farran. pp. 33 34, pi. VI figs 



i 12. 



1905. longispinus n. sp. Wolfenden, pp. 7 8, pi. III. 



1906. latifrons G. O Sars. Pearson, p. 14. 

 1908. Farran, p. 36. 



1908. Gaetanus latifrons G. O. Sars. v. Bremen, p. 39, fig. 43. 



1908. holti Farrau. Wolfeuden, p. 31. 



1909. A. Scott, pp. 49 50, pi. X figs 



10-17. 

 1911. Wolfenden, pp. 232 233, fig. 19. 



