75 



longer than the third segment. The anal segment is very small. It is only about one-fourth 

 of the length of the third segment. The furcal joints are nearly as long as broad, and are 

 about equal to the length of the anal segment. The second inner seta on the furcal joints is 

 much longer than any of the others. 



The antennules extend to about the middle of the genital segment. 



The antennae, mandibles, maxillae and maxillipedes are similar to those of Paracuchaeta 

 bar ba ia. 



1'he exopodite of the first pair of feet is indistinctly three-jointed. The outer edge spine 

 at the incomplete separation of the first and second joints is very short. 



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

 extends 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 near the base of the third outer-edge spine. The 

 sinus at the base of the second outer-edge spine on the third ioint is very deep. 



The third and fourth pairs of feet are similar to those of Paraeuchaela barbata. 



Male unknown. 



Paraeuchaeta weberi is easily recognised by the peculiar form of the genital segment 

 when seen in side view. It can readily be separated by this character alone, from any of the 

 other members of the genus. 



This distinct form is named in compliment to Professor Max Weber, the director of 

 the 'Siboga' expedition, which has considerably extended our knowledge regarding the distri- 

 bution of the deep water Copepoda. 



Occurrence. — Eleven specimens were found in the plankton collected with the 

 Hensen vertical net at the following' stations. 



Stat. 185 (1536 metres to surface), 3 specimens. — Stat. 230 (2000 metres to surface), 4 

 specimens. — Stat. 243 (1000 metres to surface), 3 specimens. — Stat. 276 (756 metres to 

 surface), 1 specimen. 



9. Paraeuchaeta spinifera (Esterly). Plate XXII, figs. 9 — 16. 



Euchaeta spinifera Esterly, 1906, p. 62, pis. IX, XI, XIV. 



A single male specimen which is doubtfully referred to the species described by Esterly 

 as Euchaeta spinifera was found in plankton collected with the Hensen vertical net at Station 

 2 7 6, 750 metres to the surface. Length 5,5 mm. 



There is very little to distinguish this species from the male of Paraeuchaeta norvegica, 

 except the shape and armature of the second joint of the exopodite of the left fifth foot. The 

 inner distal angle of the joint in this species is produced into a pointed process, and both 

 sides of the distal margin are fringed with fine spines (Plate XXII, fig. 16). 



10. Paraeuchaeta sarsi (Farran). Plate XXI, figs. 9 — 15. 



Euchaeta barbata Sars, 1902, p. 41, pi. XXVIII. 



Euchaeta barbata Wolfenden, 1904, p. 135, fig. r, Nos. 5 & 6. 



Euchaeta sarsi Farran, 1908, p. 41, pi. III, figs. 15 & 16. 



75 



