246 
slightly inflated genital segment of the female, by the short anal segment, and by the long 
slender furcal joints. The furcal joints are about four times the length of the anal segment. 
This species appears to be rather sparsely distributed. It has been recorded from the 
Indian and Pacific Oceans. 
1. Corycaeus carinatus Giesbrecht. 
Corycaeus carinatus Giesbrecht, 1891, p. 481. 
Corycaeus carinatus Giesbrecht, 1893, p. 661. pl. 51. 
Corycaeus carinatus 1. C. Thompson, 1900, p. 293. 
Corycaeus carinatus Wheeler, 1900, p. 192, fig. 30. 
Corycaeus carinatus A. Scott, 1902, p. 421. 
Corycaeus carinatus Thompson & Scott, 1903, p. 285. 
Corycaeus carinatus Wolfenden, (1905(@), p. 1029. 
Corycaeus carinatus Esterly, 1905, p. 226, fig. 62. 
One specimen identical with the above species was obtained from the plankton collected 
with the HeEnsen vertical net at Station 203, 1500 metres to the surface. 
Corycaeus carimatus is closely related to Corycaeus rostratus. The abdomen of the 
female consists of a single segment, but it is distinctly more inflated than in Corycaeus rostratus 
and the furcal joints are moderately long, and slender. The length of the furcal joints is equal 
to half the length of the abdomen. The furcal joints of Corycaeus rostratus are equal to one- 
fourth of the length of the abdomen. 
This Corycaeus has been recorded from the Atlantic, Indian, and Pacific Oceans. 
3. Corycaeus concinnus Dana. 
Corycaeus concinnus Dana, 1847, pp. 150—I154. 
Corycaeus concinnus Dana, 1852, p. 1225, pl. 86. 
Corycaeus concinnus Giesbrecht, 1893, p. 661, pl. 51. 
Corycaeus concinnus A. Scott, 1902, p. 421. 
Corycaeus concinnus Thompson & Scott, 1903, p. 286. 
Twenty-two specimens belonging to the above species were obtained from the plankton 
collected at the following stations. 
Stat. 50, 3 specimens. — Stat. 141 (HENSEN vertical net, 1500 metres to surface), 10 spe- 
cimens. — Stat. 148 (HENSEN vertical net,1000 metres to surface), 4 specimens. — Stat 
230 (HENSEN vertical net, 2000 metres to surface), 5 specimens. 
The female of Corycaews concinnus can be recognised by the long and rather slender 
abdomen. The abdomen consists of a single segment. The proximal end is distinctly inflated, 
and the distal end is rather sharply contracted. The furcal joints are moderately slender and 
are equal to about one-third of the length of the abdomen. 
Corycaeus conctnnus has been recorded from the Indian and Pacific Oceans. 
4. Corycaeus danae Giesbrecht. 
Corycaeus danae Giesbrecht, 1891, p. 480. 
Corycaeus danae Giesbrecht, 1893, p. 660, pl. 51. 
246 
