36 BRITISH COPEPODA. 



the male is elongated and indistinctly biarticulate, but 

 in the female is undivided. The abdomen of the male, 

 including the tail-setse, is equal in length to the cepha- 

 lothorax ; the caudal segments (PL LXXXIII, fig. 15) 

 are not quite double the length of the last abdominal 

 segment, the length of both together being just equal 

 to that of the first elongated division of the abdomen ; 

 in the female^ however, the caudal laminae are longer. 

 The tail-set^e of the male are short and stout, the 

 innermost and longest being about half as long as the 

 abdomen, the other two successively shorter ; the 

 caudal segments have also on the outer edge, a little 

 removed from the apex, a short slender seta ; in the 

 female all the tail appendages are shorter and more 

 slender. Length a^th of an inch ('9 mm.). The 

 colour of the animal is a clear glaucous green. 



Sir John Lubbock first described this species from 

 specimens taken at Weymouth; Dr. Glaus also de- 

 scribes it in his work on the ' Copepoda of the Mediter- 

 ranean and North Sea,' but without giving the precise 

 locality. Captain Toynbee's specimens were taken in 

 two widely separate localities, viz. lat. 7° 15' N., long. 

 27° 52' W., and lat. 13° 43' S., long. 33° 55' W. For 

 the gatherings in which the specimens here described 

 were found I am indebted to my friend Mr. E. C. 

 Davison, but although the species occurred in several 

 places — all of them off the Atlantic shores — it was in 

 no case met with abundantly, and although I have 

 myself frequently used the surface-net in those districts 

 I never to my knowledge took a single example of 

 Corycceus. The following are the localities of Mr. 



