7' 



the exopodite of the second pair of feet, reaches to near the apex of the first outer-edge spine 

 on the third joint. The second outer-edge spine on the third joint extends to the base of the 

 third outer-edge spine. The appendicular seta on the furcal joints is longer than any of the 

 others. Length of female 5 mm. 



This species has only been previously recorded from the North Atlantic. 



3. Paraeuchaeta californica (Esterly). Plate XV, figs. 1 — 8. 



Euchaeta californica Esterly, 1906, p. 60, pis. IX & X. 



Ten females of this form, which appears to be identical with the Euchaeta californica, 

 described by C. O. Esterly, were found in the plankton collectecl by the 'Siboga' at the fol- 



lowing stations. 



Stat. 141 (HENSEN vertical net 1500 metres to surface), 2 specimens. -- Stat. 143 (HENSEN 

 vertical net 1000 metres to surface), 2 specimens. -- Stat. 185 (HENSEN vertical net 1536 

 metres to surface), 1 specimen. - - Stat. 230 (HENSEN vertical net 2000 metres to surface), 

 2 specimens. — Stat. 252, 1 specimen. — Stat. 276 (HENSEN vertical net 750 metres to 

 surface), 2 specimens. 



The whole of the specimens from the 'Siboga' collections, possessed the peculiar curved 

 process projecting from the genital opening. The protuberance is paired, but the one on the 

 left side is rather longer than that on the right. When viewed from the side, the forehead 

 appears very much contracted, and the rostrum projects forward in an almost continuous line 

 with the cephalic margin. 



The outer-edge spine on the second joint of the exopodite of the second pair of feet, 

 extends beyond the apex of the first outer-edge spine on the third joint. The second outer-edge 

 spine on the third joint just reaches the base of the third outer-edge spine. The second inner 

 seta on the furcal joints is much longer than any of the others. 



The figure shewing the lateral view of the genital segment is rather different from that 

 given by Esterly. The protuberances at the side of the genital opening, appear to be more 

 pronounced than in Esterly's species but this may be due to age. The 'Siboga' specimens 

 measured 7 mm. in length. 



The species was described by Esterly from a single specimen obtained in the Pacific 

 Ocean and its length is given as S mm. 



4. Paraeuchaeta propinqua (Esterly). Plate XVII, figs. 13 — 20. 

 Euchaeta propinqua Esterly, 1906, p. 61, pis. IX & X. 



Two females which appear to be identical with Esterly's Euchaeta propinqua, were found 

 in the plankton collected with the Hexsen vertical net at Station 230, 1 500 metres to the surface. 



The species bears a close resemblance to Paraeuchaeta californica, but can be distinguished 

 from it by the less swollen and more elongate genital segment, when viewed from the dorsal 

 aspect. The outer-edge spines on the exopodite of the second pair of feet are proportionally 

 shorter than in Paraeuchaeta californica. 



The outer-edge spine on the second joint extends to the base of the first outer-edge 



