16 Mr. I. C. Thompson on the Copepoda 
Rhincalanus nasutus, Giesbrecht. 
1888. Rhincalanus nasutus, Giesbrecht, Atti Acc. Lincei Rend. ser. 4, 
vol. iv. p. 334, 
One of the largest of known Copepoda. It was very 
plentiful at the thirteen stations in which it occurred. 
Rhincalanus cornutus, Dana. 
1849. Calanus cornutus+ C. rostrifrons, op. cit. vol. ii. p. 19. 
Less plentiful than R. nasutus, occurring at ten stations 
and at similar depth to the latter—from 560 to 1710 fathoms. 
Mecynocera Clausi, Thompson. 
1888. Mecynocera Clausi, Thompson, Journ. Linn. Soc., Zool. vol. xx. 
p. 150 
A few specimens of this species, easily recognized by its 
long delicate antennz, were found at four stations at depths 
from 500 to 1300 fathoms. 
Pseudocalanus elongatus, Boeck. 
1864. Clausia elongata, Boeck, Forh. Selsk. Christian. p. 10. 
One of the commonest species round our own shores. It 
was present in nearly half the bottles of this collection, and 
at all depths from the surface to 1710 fathoms. 
Spinocalanus abyssalis, Giesbrecht. (PI. I. fig. 6.) 
1888. Spinocalanus abyssalis, Giesbrecht, Atti Acc. Lincei Rend. ser. 4, 
vol. iv. p. 235. 
One specimen only, an immature male, was taken at 1570 
fathoms. Fig. 6 shows the rudimentary fifth feet. The 
male of this species has not been previously reported. 
. Aitideus armatus, Brady. 
1883. Atidius armatus, Brady, Rep. Voy. ‘ Challenger,’ vol. viil. p. 75. 
Occurs at six stations at depths between 230 and 1670 
fathoms. As remarked by Brady, ‘the strong curved 
rostrum and the remarkably elongated, spiniform, posterior 
thoracic segment distinguish this species at a glance from 
any other with which I am acquainted.” 
Bradyidius armatus, Vanhoften. 
1878. Pseudocalanus armatus, Brady, Cop. Brit. Isl. vol. i. p. 46. 
The hitherto recorded area of distribution of this species 
