obtained during the Cruise of the ‘ Oceana.’ 27 
One specimen only of this remarkable Copepod was taken 
at 560 fathoms. 
The long, brown, ribbon-like, granular setze on the ante- 
rior and posterior antenne, as well as on the mandible and 
maxilla, and the peculiar shape of the posterior antenne 
readily distinguish this species from any other known to me. 
Heterorhabdus spinifrons, Claus. 
1863. Heterocheta spinifrons, Claus, Freileb. Cop. p. 182. 
One of the most widely distributed species throughout the 
collection, having been taken at fourteen stations in fair 
abundance at depths from 375 to 1770 fathoms. It has been 
reported from the Mediterranean and from both Atlantic 
and Pacific Oceans. 
Heterorhabdus papilliger, Claus. 
1863. Heterocheta papilligera, Claus, Freileb. Cop. p. 182. 
One specimen only, found at 1510 fathoms. Not before 
reported from the Atlantic Ocean. 
Heterorhabdus abyssalis, Giesbrecht. 
1889, Heterocheta abyssalis, Giesbrecht, Atti Acc. Lincei Rend. ser. 4, 
vol, v. p. 812. 
Several specimens, all males (the female being still un- 
known), were found at three stations at depths of from 950 
to 1190 fathoms. Giesbrecht’s record was the Atlantic, but 
at the great depth of 4000 metres. 
Heterorhabdus Clausi, Giesbrecht. 
1889. Heterocheta Clausti, Giesbrecht, Atti Acc. Lincei Rend. ser. 4, 
vol. v. p. 812. 
Found at one station only at 1410 fathoms. Its only 
previous record was from the Pacific. 
Heterorhabdus vipera, Giesbrecht. 
1889. Heterocheta vipera, Giesbrecht, Atti Acc. Lincei Rend. ser. 4, 
vol. y. p. 812. 
A few specimens occurred at two stations at depths of 
950 and 1410 fathoms. The Atlantic and Pacific are its 
known range of distribution. 
Heterorhabdus longicornis, Giesbrecht. 
1889. Heterocheta longicornis, Giesbrecht. 
One specimen only (a female) was found at 1710 fathoms. 
