28 Mr. I. C. Thompson on the Copepoda 
Its very long slender antennz, taken in conjunction with its 
still longer caudal sete, easily distinguish it. The Atlantic 
and Pacific Oceans are its recorded habitats. The male 
remains unknown. 
Haloptilus longicornis, Claus. 
1863. Hemicalanus longicornis, Claus, Freileb. Cop. p. 179. 
Fairly common at three stations at depths from 620 to 
1770 fathoms. Recorded from the Atlantic and Pacific 
Oceans and the Mediterranean. 
Haloptilus ornatus, Giesbrecht. 
1892. Hemicalanus ornatus, Giesbrecht, F. Fl. Neapel, vol. xix. p. 84. 
Found at two stations at 810 and 1670 fathoms. Pre- 
viously known only from the Mediterranean. 
A strong hooked spine and plumose hairs from the other 
lobes of the anterior foot-jaws serve to distinguish this 
species, 
Haloptilus spiniceps, Giesbrecht. 
1892. Hemicalanus spiniceps, Giesbrecht, F. F1. Neapel, vol. xix. p. 384. 
One specimen only from a depth of 500 fathoms was 
found. Its only previous record is the Mediterranean. 
Augaptilus fiigerus, Claus. 
1863. Hemicalanus filigerus, Claus, Freileb. Cop. p. 179. 
A few specimens of this species were found at two stations 
at depths of 1065 and 1270 fathoms. Like the last species, 
its only previous record is the Mediterranean. 
Augaptilus palumboi, Giesbrecht, (Pl. I. figs. 1, 2.) 
1889. Augaptilus palumbu, Giesbrecht, Atti Acc. Lincei Rend. ser. 4, 
vol. v. p. 813. 
The only specimen found (fig. 1) was taken at 1070 fathoms, 
and fortunately proved to be a male, hitherto unknown. 
The chief differences between the male and female are in 
the anterior antenne and the fifth feet ; the latter, however, 
in this specimen (fig. 2) are unfortunately immature. The 
right and left anterior antenne vary considerably (fig. 1). 
The right is 14-jointed, the third, fourth, and fitth joints 
being short and swollen ; the left is 19-joimted, the joints 2 
to 6 being short and swollen. Waving sete are numerous 
throughout the length of both antennz. Length of male 
4 yillim. 
Its only previous record is the Pacific Ocean. 
Eo 
