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and a basal part. The proximal spine on the free joint is about two and onehalf times longer 

 than the apical spine. The male is unknown. 



Scolccithricella longifurca is only known from the Pacific (Jcean. 



6. Scolecithricella ctenopus (Giesbrecht). 



Scolecithrix ctenopus Giesbrecht, 1888, p. 337. 



Scolecithrix ctenopus Giesbrecht, 1893, p. 266, pis. 13 & 37. 



Scolecithrix ctenopus T. Scott, 1893, p. 48, pi. V, figs. 2 — 9. 



Scolecithrix ctenopus Giesbrecht & Schmeil, 1898, p. 46. 



One male belonging to this species was found in the plankton collected with the Hensen 

 vertical net at Station 118, 900 metres to the surface. 



The male is easily identified by the structure of the fifth pair of feet. The left foot is 

 long and narrow and the end joint is furnished on its inner margin with a comb-like row of 

 fine spines. The right foot is very small. Only the male of this form is known. 



When the female is discovered it will probably be found necessary to remove this species 

 to another genus, as the fifth pair of feet of the male is more closely related to Xanthocalanus 

 than to Scolecithricella. 



Scolecithricella ctenopus has only been recorded from the Pacific Ocean and from the 

 Gulf of Guinea. 



7. Scolecithricella marginata (Giesbrecht). 



Scolecithrix marginata Giesbrecht, 1888, p. 33S. 

 Scolecithrix marginata Giesbrecht, 1893, p. 266, pi. 13. 

 Scolecithrix marginata Giesbrecht & Schmeil, 1898, p. 44. 



Thirteen females were obtained from the plankton collected at the following stations. 



Stat. 16, 1 specimen. — Stat. 40, 1 specimen. — Stat. 47'', 1 specimen. — Stat. 66, 1 spe- 

 cimen. — Stat. 75, 1 specimen. — Stat. 118, 1 specimen. — Stat. 128, 1 specimen. — 

 Stat. 142, 1 specimen. — Stat. 143, 1 specimen. — Stat. 185, 2 specimens. — Stat. 203 

 (surface), 1 specimen. — Stat. 243, 1 specimen. 



Scolecithricella marginata bears a close resemblance to Scolecithricella auropecten, but 

 can be distinguished from it by the character of the armature of the fifth feet. The inner 

 marginal spine is moderately stout and it is fringed with fine spinules. The male is unknown. 



This species is only known from the Pacific Ocean. 



8. Scolecithricella profitnda (Giesbrecht). 



Scolecithrix profunda Giesbrecht, 1893, p. 266, pi. 13. 

 Scolecithrix profunda Giesbrecht & Schmeil, 1898, p. 43. 



One female was found in the plankton collected with the Hensen vertical net at Station 

 141, 1500 metres to the surface. 



Scolecithricella proftmda resembles Scolecithricella vittata in general appearance, and the 

 fifth pair of feet is not unlike that of Scolecithricella abyssalis at first sight. The apex of the 



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