113 
This species was rather scarce in the area investigated. Fifteen specimens were obtained 
from the following six stations. 
Stat. 81, 2 specimens. — Stat. 93, 3 specimens. — Stat. 96 (day), 2 specimens. — Stat. 96 
(night), 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, has a distinct knee near the proximal end. 
The species has already been recorded by Creve from the Malay Archipelago. 
2. Centropages elongatus Giesbrecht. 
Centropages elongatus Giesbrecht, 1896, p. 322, pl. 5, figs. 3—6. 
Centropages elongatus Giesbrecht & Schmeil, 1898, p. 58. 
Centropages elongatus A. Scott, 1902, p. 404, pl. 1, figs. 13 & 14. 
Centropages elongatus Thompson & Scott, 1903, p. 246. 
Centropages elongatus Cleve, 1903, p. 359. 
Centropages elongatus Wolfenden, 1905 (a), p. 1014, pl. 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), I 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 Cenxtropages 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 also obtained the species from plankton collected in a similar manner by 
Mr. H. C. Rostyson, while making a voyage between Suez and Colombo in 1901, and again 
from Professor HrRDMAN’s samples taken on the same route in 1902. WOLFENDEN found the 
species in the plankton collected by Mr. J. Srantey GarDINER around the Maldive Islands. 
3. Centropages furcatus (Dana). 
Catopia furcata Dana, 1849, p. 25. 
Centropages furcatus Brady, 1883, p. 83, pl. XXVIII. 
Centropages furcatus Giesbrecht, 1893, p. 304, pls. 17, 18 & 38. 
Centropages furcatus T. Scott, 1893, p. 77. 
“Centropages furcatus Giesbrecht & Schmeil, 1898, p. 56. 
Centropages furcatus I. C. Thompson, 1900, p. 279. 
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SIBOGA-EXPEDITIE XXIXa@. 15 
