n 3 



This species was rather scarce in the area investigated. Fifteen specimens vvere obtained 

 from the following six stations. 



Stat. Si, 2 specimens. — Stat. 93, 3 specimens. — Stat. 96 (day), 2 specimens. — Stat. 96 

 inight), 2 specimens. — Stat. 282, 3 specimens. — Stat. 304, 3 specimens. 



Centropages calaninus is not unlike Centropages violaceus in general appearance. The 

 female can readily be separated, however, by the moderately long anal segment, and by the 

 structure of the fifth pair of feet. The spiniform projection of the second joint of the exopodite 

 is nearly straight. It extends beyond the distal end of the third joint. The claw-like third joint 

 of the exopodite of the right fifth foot of the male, lias a distinct knee near the proximal end. 



The species has already been recorded by Cleve from the Malay Archipelago. 



2. Centropages elongatus Giesbrecht. 



Centropages elongatus Giesbrecht, 1896, p. 322, pi. 5, figs. 3 — 6. 

 Centropages elongatus Giesbrecht & Schmeil, 1898, p. 58. 

 Centropages elongatus A. Scott, 1902, p. 404, pi. 1, figs. 13 & 14. 

 Centropages elongatus Thompson & Scott, 1903, p. 246. 

 Centropages elongatus Cleve, 1903, p. 359. 

 Centropages elongatus YVolfenden, 1905(0), p. 1014, pi. XCVIII. 



This Centropages was very rare. Only five specimens were obtained from the plankton 

 collected during the traverse. The following are the stations where it was noted. 



Stat. 66, 1 specimen. — Stat. 96 (day), 1 specimen. — Stat. 96 (night), 1 specimen. — 

 Stat. 128 (HENSEN vertical net, 700 metres to surface), 2 specimens. 



The females are readily separated from the females of the other species, by the proportional 

 length of the segments of the abdomen, and by the length of the projection of the second 

 joint of the exopodite of the fifth pair of feet. The second and third abdominal segments are 

 of nearly equal length. When viewed from above, the lateral margins appear regular in outline. 

 The projection of the second joint of the exopodite of the fifth pair of feet, is very little 

 longer than the third joint. 



Giesbrecht described this Centropages from specimens found in plankton collected from 

 the water pumped into the sanitary tank of a steamship, when the vessel was traversing the 

 Red Sea in 1895. I a ^ so obtained the species from plankton collected in a similar marmer by 

 Mr. H. C. Robinson, while making a voyage between Suez and Colombo in 1901, and again 

 from Professor Herdman's samples taken on the same route in 1902. Wolfenden found the 

 species in the plankton collected by Mr. J. Stanley Gardiner around the Maldive Islands. 



Centropages furcatns (Dana). 



Catopia furcata Dana, 1S49, p. 25. 



Centropages furcatns Brady, 1883, p. 83, pi. XXVIII. 



Centropages furcatns Giesbrecht, 1893, p. 304, pis. 17, 18 & 38. 



Centropages furcatns T. Scott, 1893, p. jj. 



Centropages furcatns Giesbrecht & Schmeil, 1898, p. 56. 



Centropages furcatns I. C. Thompson, 1900, p. 279. 



113 



SIBOGA-EXPED1TIE XXIXtf. 



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