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Stat. 128, 1 specimen. — Stat. 141, 8 specimens. — Stat. 142, 10 specimens. — Stat. 143, 

 1 specimen. ■ — Stat. 148, 2 specimens. — Stat. 177", 1 specimen. — Stat. 185, 1 specimen. — 

 Stat. 203 (1500 metres to surface), 2 specimens. — Stat. 230, 3 specimens. — Stat. 243, 

 6 specimens. — Stat. 276, 20 specimens. 



There are slight differences between the figures of the fifth pair of feet of the male given 

 by Esterly, and that shevvn in this report. The exopodite of the right foot in the 'Siboga' 

 males appears to be only tvvo-jointed. There is no secondary process at the junction of the 

 second and third joints of the exopodite of the left foot. The third joint of the left exopodite 

 terminates in a simple spine. 



Length of female 4,8 — 5,3 min. Length of male 4,1 mm. 



Fifty females and five males vvere obtained from the 'Siboga' plankton. 



Chirundina strcctsi appears to have a wide distribution. It has been obtained in the 

 warm seas of the tropics, and in the deep water of the North Atlantic, as far north as the 

 Faröe Channel. 



Genus GaetailUS Giesbrecht, 1888. 



The members of this genus are distinguished from those belonging to the other genera 

 of the family .-Elideidac, by the possession of a distinct median spine on the front of the 

 forehead. The rostrum is short and stated to be one pointed, but all the species from the 

 'Siboga' collections, except one, shew a distinct attempt of bifurcatibn at the apex. The posterior 

 margin of the first basal joint of the second maxillipedes, is furnished with a lamella. I think 

 too much is made of the shape of this lamella in the different species of the genus, as it appears 

 to be very soft and, therefore, easily distorted. 



Adult males of this genus appeared to be unknown, until the discovery of one by 

 C. O. Esterly which he described in 1906. 



Seven species belonging to the genus Gactanus were found in the 'Siboga' plankton. 



1. Gaetanus miles Giesbrecht. Plate VIII, figrs. 1 — 8. 



Gaetanus miles Giesbrecht, 1888, p. 335. 



Gaetanus miles Giesbrecht, 1S93, p. 219, pis. 14 & 36. 



Gaetanus miles Giesbrecht & Schmeil, 1898, p. 32. 



Gaetanus miles I. C. Thompson, 1903, p. 17. 



Gaetanus miles Cleve, 1904, p. 191. 



Gaetanus miles Sars, 1905 (a), p. 3. 



Gaetanus miles Pearson, 1906, p. 14. 



Gaetanus miles Farran, 1908, p. 36. 



Gaetanus miles van Breemen, 1908, p. 39, fig. 42. 



The whole of the specimens of this species were found in plankton collected with the 

 Hensen vertical net at the followingf stations. 



ö 



Stat. 118 (900 metres to surface). — Stat. 128 (700 metres to surface). — Stat. 141 (1500 

 metres to surface). — Stat. 148 (1000 metres to surface). — Stat. 185 (1536 metres to 

 surface). - - Stat. 230 (2000 metres to surface). — Stat. 276 (750 metres to surface). 



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