﻿COPEPODA 



i8i 



"/7 1904 St. 183 6i°30 L. N. i7°o8 L. W. Yt. 1800 M. Wire 37 f? (3 with egg-balls, 2 with sperm.), 8 fd", 



8y? (V), 4 yd' (V), ly? (IV). 

 ^Vs 1904 St. 104 62°47 Iv. N. i5°o3 L. W. Vt. 1500 AI. Wire 4 f $. 



This species has previously been gathered off the west coast of Ireland "at depths of from 700 

 to 1000 fathoms" at five stations "but very few specimens were found on each occasion". Wolfcnden's 

 specimens, which on account of the different shape of the genital somite (PI. XXXV fig. 3) cannot with 

 security be referred to the same species, were gathered under tlie equator ca. 20° L,. W. (depth 3000 m.) 



53. Euchaete Hansenii n. sp. 



(Text-figs 52 a — b.) 



Description. Size: 8-9 mm.; anterior division 65 mm.; urosome 2-4 nun. 



The shape of the body is like tliat of E. norvcgica. The anterior division is 27 as long as the 

 urosome, which is onh- a little longer than the width of the thorax. The proportional length of the 

 abdominal somites is 45, 26, 25. The genital soHiitc is, laterally, more suddenh- convex than in E. Sarsi, 

 and, as in this, the greatest width lies in the proximal part; the genital somite is 1-3 as long as 

 wide, but only i-i as long as deep. 

 The lateral conical process which 

 characterises E. barbala and Farraiii, 

 is wanting. In lateral view tlie geni- 

 tal protuberance differs distinctly 

 from that of E. Sarsi b\- the straight, 

 not concave, anterior process, and by 

 a fairly distinct process behind and 

 above the second one, sometimes 

 indicated in E. Sarsi, which, as usu- 

 ally, rej^resents the posterior border 

 of the vulva. The ventral surface 

 is quite different; the triangular 

 plate in front is divided into three 

 processes; the transverse plate has 

 posteriorly a median incision, on each 

 side of which arc two lobes (text-figs 

 52 a— b). ~ The antrnuulac scarcely extend to the end of the cephalo-thorax ; the appendages are 

 scarcely different from those of E. iionugica : the segment 19 is ri as long as the segments 24(^^25. 

 The niaxilliilar possess in Le i two basal, fairly long and slender, setae, followed by 6 powerfid seta 

 and one terminal somewhat .shorter one; the Basip. has 5, the Ri I 3, Ri II 4 and the Ri III 3 setae. 

 The articular membrane between Re I— II is barely indicated, and the Se is long and .slender. The Se 

 of Re I is fairly long, and extends almost to the ba.se of Se i Re III, and the .Sc 2. Re III extends to 

 the l)ase of vSe 3. 



Text-fig. 52. EucliiT-tt' Hansniii ii. sp. 

 a. f'?. Al-uloineii ^< i6. b, \'iilva in vontral view X iSo. 



