57 



The female is distinguished by its low crest and small rostrum. The genital segment is 

 asymmetrical. The inner margin of the first joint of the basiopodite of the fourth pair of feet 

 is furnished with one or two moderately long teeth. 



Euchirella pulchra has been recorded from the Atlantic and Pacific Oceans. 



7. Euchirella venusta Giesbrecht. 



Euchirella venusta Giesbrecht, 1SS8, p. 336. 



Euchirella venusta Giesbrecht, 1893, p. 253, pis. 15 & 36. 



Euchirella venusta Giesbrecht & Schmeil, 1898, p. 35. 



Euchirella venusta Cleve, 1904, p. 190. 



Euchirella venusta Sars, 1905 (a), p. 4. 



Xineteen females of this Euchirella were obtained from the plankton collected at the 

 followinej stations. 



ö 



Stat. 117% 3 specimens. — Stat. 118 (HENSEN vertical net 900 metres to surface), 1 speci- 

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

 (HENSEN vertical net 1000 metres to surface), 1 specimen. ■ — Stat. 185 (HENSEN vertical 

 net 1536 metres to surface), 2 specimens. — Stat. 203 (HENSEN vertical net 1500 metres 

 to surface), 4 specimens. • Stat. 243 (HENSEN vertical net 1000 metres to surface), 1 

 specimen. — Stat. 276 (HENSEN vertical net 750 metres to surface), 2 specimens. — 

 Stat. 315, 1 specimen. 



Euchirella venusta is closely related to Euchirella messznensis, but may be distinguished 

 from it by the absence of the sack-like projection on the dorsal surface of che genital segment. 

 The inner margin of the first joint of the basiopodite of the fourth pair of feet is furnished 

 with one or two moderately long spines. 



This species has been recorded from the Atlantic and Pacific Oceans. 



8. Euchirella maxima Wolfenden. Plate XII, fi^s. 12 — 20. 



Euchirella maxima Wolfenden, 1905, p. 18, pi. VI, figs. 9, 11. 

 Euchirella maxima Farran, 1908, p. 38. 



Adult female — length 7,2 mm. 



The cephalothorax is oblong ovate, moderately robust and slightly contracted in front. 

 The head is fused with the first thoracic segment. It is furnished with a high trianyular crest 

 and a small rostrum. The fourth and fifth thoracic segments are completely separated. The last 

 thoracic segment is produced into a lamelliform process on each side. 



The abdomen is four-jointed. The combined length of the abdomen and furca is contained 

 four and a half times in the total length of the cephalothorax, from the apex of the crest to 

 the base of the genital segment. The genital segment is symmetrical and only very slightly 

 swollen below. It is as long as the combined lengths of the next three segments. The second, 

 third, and fourth segments are of about equal length. The furcal joints are as broad as long, 

 and are slightly longer than the anal segment. The posterior margins of the first, second, and 

 third segments, are fringed with fine spines. 



The antennules are twenty-four-jointed and extend to the end of the furca. 



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SIBOGA-EXPEDITIE XX1X<7. S 



