COPEPODA 



177 



Apart from the bigger size and more straight rostrum, the stage is scarcely different from that 

 of E. norvegica (text-figs 49 o — p). 



Occurrence. The S/S Thor has »/ 7 04 St. 183 6i°30 L. N. i7°o8 L,. W. Yt. 1800 M. Wire taken 

 9 f?, 2 £<?, 4 >'? (V), 1 y<? (V), 2 y? (IV), 1 yo* (IV), 1 y (III) and ">/ 7 09 St. 180 6i° 3 4 L. N. i9°o 3 L. W. 

 Yt. 1800 M.Wire 1 f$. 



Distribution. Remarks. About the distribution of this species only very little is known, as will 

 be understood from the following remarks. By Farrran it has been recorded as occurring "in small 

 numbers on five stations of from 700 to xooo fathoms" off the west coast of Ireland. As neither Sars nor 

 Scott says anything about the characteristic tubercle on the left side of the genital somite, and as their 

 descriptions are not very perfect, I do not think that we should be right in including the Mid Atlantic 

 and the Indian Ocean within the range of this species. Far ran, with some reluctance, refers his species 

 to B r a d y's old species from 36 L,. S. 46 L.W., on account of the corresponding size and similar structure of 

 pes II; Brady's figure of the genital protuberance and the smooth ventral surface of the abdominal somites 

 III — IV seems to me to speak against the correctness of this view. The same opinion is shared by Wolf- 

 enden, who regards E. barbata as more related to E. Wofendenii than to any other (cf. 1911, p. 300); as, 

 however, the name is now applied to a well defined species, and as there is 110 reason to hope for a 

 sure identification, I prefer to follow Far ran in this respect. 



51. Euchaete Sarsi Farran. 

 (PI. VI figs 7 a — b; text-figs 50 a — f.) 



1908. Euchaste Sarsi n. sp. Farran, p. 41, pi III figs 15—16. 

 1909.? — — Farr. A. Scott pp. 75—76, pi. XXI figs 9—15. 



Description. % Size of specimen from St. 183 was 10 mm.; anterior division 7-3 mm. ; urosome 

 27 mm. Farr an's specimens measured 9-8 — io - 2 mm. 



The shape of the body etc. scarcely show features of interest. The anterior division is 27 as 

 long as the urosome; the proportional length of the abdominal segments is 45, 27, 27. The genital 

 somite has not on the left side the characteristic tubercle found in E. Farrani, and the ventral pro- 

 tuberance has the anterior process slightly concave in the middle, and the posterior process less 

 prominent than in the other species (text-figs 50 a— e). The vulva is in the ventral surface quite dif- 

 ferent from that of E. Farrani and barbata. The median chitinous plate has posteriorly a median 

 incision, but the area in front is irregularly wrinkled, and the triangular plate is only indicated; the 

 trilobate process is very indistinct (text-fig. 50 f). The segment 19 of the antennulae is ri as long as 

 24 <n> 25. The Le of the maxillulae possess 2 extremely short and one longer seta proximally, and in addi- 

 tion to these the usual long ones distally. The pes I has a very short Se Re I. The Se of Re II extends 

 to the end of Se 1 Re III, and the Se 2 Re III extends somewhat beyond the middle of the third division. 



The anterior surface of the labrum is distinctly different from that of E. norv. and Farrani, as 

 realised by comparing fig. 7 a and the description of E. norv. The oral surface of the labrum is very 

 much like that of E. norv. The lateral group consists of 30 — 40 short spines; the groups 1 — 2 are placed 

 near to each other; the 3—5 are fairly well separated. The arrangement of hairs in front of lamina 



The Ingolf-Expedition. III. 4. 2 3 



