C 
32 Mr. I. C. Thompson on the Copepoda 
Oithona similis, Claus. 
1863. Otthona helgolandica, Claus, Freileben Cop. p. 104. 
One of the commonest species in the collection, occurrmg 
plentifully at twenty-eight stations at depths from the surface 
to 1710 fathoms. It is abundant throughout the northern 
seas, extending to the Mediterranean and the Canary Islands 
and Atlantic Ocean. 
Oithona nana, Giesbrecht. 
1862. Oithona nana, Giesbrecht, F. Fl. Neapel, vol. xix. p. 549. 
Only one specimen, from 1610 fathoms, was noticed, 
though, possessing no strong mark for recognition, others 
may have been passed over. Its blunt broad head is its 
distinctive feature. 
Thorellia brunnea, Boeck. 
1864. Thorellia brunnea, Boeck, Oversigt over de ved Norges Kyster 
iagt. Cop. p. 26. 
A northern species occasionally found in British seas, but 
apparently not hitherto recorded further south. One specimen 
was found at 270 fathoms. 
Microsetella atlantica, Brady & Robertson. 
1873. Microsetella atluntica, Brady & Robertson, Ann. & Mag. Nat. 
Hist. ser. 4, vol. xii. p. 180. 
Common throughout the collection, occurring at twenty- 
eight stations at depths from 270 to 1710 fathoms. It is 
common in our own seas, and I’. Scott reports it as plentiful 
about the Gulf of Guinea. 
Microsetellu rosea, Dana. 
1847. Canthocamptus roseus, Dana, Proc. Amer. Acad. Boston, vol. i. 
p. 150. © 
Although not so widely distributed throughout the collec- 
tion as the preceding species, it was plentiful at seventeen 
stations. Dana reported it from the Sulu Sea, Giesbrecht 
found it in the Eastern Pacific, and T. Scott in the Gulf of 
Guinea. 
Euterpe acutifrons, Dana. 
1847. Euterpe acutifrons, Dana, Proc. Amer. Acad. Boston, vol. i. 
p. 150. 
One specimen of this species, not uncommon round our 
British shores, was taken at 950 fathoms. Dana’s habitat 
