7 6 



One specimen which appears to be identical with the male figured by Sars in 'Crustacea 

 of Norway' was obtained from the plankton collected with the Hensen vertical net at Station 230, 

 2000 metres to the surface. Length 7,8 mm. 



Farran considers that the form which Sars doubtfully refers to Euchaeta barbata Brady, 

 is distinct from that species, and is inclined to include it under the new name that he has 

 established for the reception of a form recorded by Wolfenden as Euchaeta barbata Brady. 



I see nothing to distinguish the left fifth foot of the 'Siboga' specimen from Sars' 

 description and figure of the second joint of the left fifth foot of the male. Sars gives the size 

 of the male as 10 mm. 



11. Paraeuchaeta dentata nov. sp, Plate XXI, figs. 16 — 23. 



Male — length 8 mm. 



This species resembles the male of Paraeuchaeta norvegica (Boeck) in general appearance, 

 but the last thoracic segment when viewed from above is seen to be asymmetrical. The left 

 side is more produced than the right. 



The exopodite of the first pair of feet is distinctly three-jointed. The first joint is furnished 

 with a minute outer-edge spine. 



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

 feet is moderately stout, and is distinctly longer than any of the others. The sinus at the base 

 of the spine is rather shallow. The apical portion of the outer margin of the joint is boldly curved. 



The second joint of the left exopodite of the fifth pair of feet is moderately broad, and 

 the inner distal angle is produced into a blunt point. The inner margin of the apex is concave, 

 and the whole of the margin of the produced part is rather coarsely serrate. The inner surface 

 of the proximal part of the joint is furnished with a short stout tooth. (Plate XXI, hg. 23). 



The second inner seta on the furcal joints is longer than the others. 



Occurrence. — One specimen was found in the plankton collected with the Hensen 

 vertical net at Station 276, 750 metres to the surface. 



12. Paraeuchaeta tuberculata nov. sp. Plate XXI, figs. 1 — 8. 



Male — length 6,8 mm. 



This species resembles Paraeuchaeta dentata in general appearance, but is easily separated 

 from it by the structure of the left exopodite of the fifth pair of feet. The first joint has two 

 tubercles on the middle of the outer margin, and a small spine midway between the distal 

 tubercle and the apex. The inner distal angle of the second joint is produced to a sharp 

 unguiform point, not unlike that found in the male of Paraeuchaeta norvegica. The distal half 

 of the inner margin of the joint is coarsely dentate. 



The species has a close resemblance to the male of Paraeuchaeta norvegica in the 

 structure of the left exopodite of the fifth pair of feet, and may possibly turn out to be a tropical 

 variation of that species. The produced apex of the inner distal angle of the second joint is not 

 so sharply pointed or curved, however, as in typical Paraeuchaeta norvegica. In the meantime 



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