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Stat. 128 (700 metres to surface), 1 male. — Stat. 141 (1500 metres to surface), r female. — 
Stat. 276 (750 metres to surface), 1 male. 
My father has obtained specimens of a male form from the plankton collected in the 
Faré6e Channel, by the Scottish International Fisheries Cruiser ‘Goldseeker’, that is identical 
with the male of the present species. 
The two species now described as new, may eventually prove to be the same as some 
of the new Augaptilus, described by Professor G. O. Sars, in ‘Bulletin du Musée Océanographique 
de Monaco’, part 2, (N° 40) 1905. Only the preliminary descriptions are there given. It is 
very difficult to identify the members of this genus without illustrations. 
Genus Haloptilus Giesbrecht, 1898. 
The members of this genus are readily recognised by their transparent and flattened 
body. The abdomen is comparatively short. It is composed of four segments in the female. 
The endopodite of the antennae is much longer than the exopodite. 
Four species belonging to this genus were present in the plankton collected by the ‘Siboga’. 
1. Hlaloptilus longicornis (Claus). 
Flemicalanus longicornis Claus, 1863, p. 179, pl. XXIX. 
Hemicalanus longicornis Brady, 1883, p. 44, pl. IX, figs. 1 & 7. 
Hemicalanus longicornis Giesbrecht, 1893, p. 384, pls. I, 2, 27. 
Hemicalanus longicornis T. Scott, 1893, p. 32. 
Haloptilus longicornis Giesbrecht & Schmeil, 1898, p. 118. 
Flaloptilus longicornis Sars, 1902, p. 121, pls. LXXXII & LXXXIII. 
FHaloptilus longicornis 1. C. Thompson, 1903, p. 28. 
Flaloptilus longicornis Wolfenden, 1904, p. 135. 
Haloptilus longicornis Sars, 1905 (0), p. 4. 
Flaloptilus longicornmis Farran, 1905, p- 45. 
FHlaloptilus longicornis Pearson, 1906, p. 27. 
Haloptilus longicornis Farran, 1908, p. 67. 
FHlaloptilus longicornis van Breemen, 1908, p. 128, fig. 146. 
Twenty-two specimens belonging to this species were obtained from the plankton collected 
at the following stations. 
Stat. 118 (HENSEN vertical net, goo metres to surface), 2 specimens. — Stat. 128 (HENSEN 
vertical net, 700 metres to surface), 2 specimens. — Stat. 129, I specimen. — Stat. 141 
(HENSEN vertical net, 1500 metres to surface), 3 specimens. — Stat. 148 (HENSEN vertical 
net, 1000 metres to surface), 4 specimens. — Stat. 203 (HENSEN vertical net, 1500 metres 
to surface), 4 specimens. — Stat. 220 (HENSEN vertical net, 200 metres to surface), 2 spe- 
cimens. — Stat. 252, 1 specimen. — Stat. 276 (HENSEN vertical net, 750 metres to surface), 
3 specimens. 
Hlaloptilus longicornis is a comparatively small form. It can readily be recognised by the 
knob-like projection on the forehead when viewed from above, and by the very long antennules. 
This species has a wide distribution in the great oceans. It has been recorded from the 
North Atlantic off the Coast of Norway, by Professor G. O. Sars. 
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