ia 
TROPICAL PLANKTON. 293 
Coryceus longistylis, Dana. 
1849. Coryceus longistylis, Dana, Proc. Amer. Acad., Boston, vol. 
II., pp. 8—61. 
In the length of its caudal stylets this species closely 
resembles C. furcifer, but its abdomen being composed of 
one seement only, readily distinguishes it. It occurred in 
17 and 20, Wyse stations only, the localities being the Red 
Sea and Mediterranean, both being an addition to its 
known range of distribution, which has hitherto been 
confined to the Pacific Ocean and the China sea. 
Coryceus carinatus, Giesbrecht. 
1891. Coryceus carinatus, Giesbrecht, Atti Acad. Lincei Roma, 
vol. VII., 1 Sem., pp. 474—481. 
This species, which much resembles C. rostratus, except 
in the relative lengths of its abdomen and caudal stylets, 
was found only once, No. 7, Wyse collection, from the 
Indian Ocean, its previous record being the Pacific Ocean. 
The specimen agreed with Giesbrecht’s description and 
drawing, but I doubt whether time and future captures 
will not cause it to be classed as C. rostratus. 
Coryceus longicaudis, Dana. 
1849. Coryceus longicaudis, Dana, Proc. Amer. Acad., vol. IL., 
pp. 8—6l. 
Like the last species, this one very nearly resembles 
C. rostratus, except in the relative lengths of abdomen 
and caudal stylets, which are in C. longicaudis more 
attenuated. It was present in 4, 5, 6, and 16, Wyse 
collection, and in 2, 8, 10, and 15, Herdman series, all from 
the western portion of the Indian Ocean. Its previous 
records are the Atlantic and Pacific Oceans. 
Coryceus gibbulus, Giesbrecht. 
1891. Coryceus gibbulus, Giesbrecht, Atti Accad. Lincei Roma, vol. 
VII., 1 Sem., pp. 474—481. 
This species rather closely resembles C. rostratus, but 
