FIGURES 20 and 22 



Fig. 20. Ceratium ranip es Cleve with extreme number of "fingers" on antapical 

 horns. From station 48, northof Easter Island. Full ventral view of this specimen is 

 shown in fig. 19J. 



Fig. 22. A, Ceratium carriense Gourret, from station 1, Gulf Stream; B, Ceratium 

 trichoceros (Ehr.) Kofoid, from station 50, near Easter Island. 



C-D. Ceratium deflexum Kofoid. C, ventral view of specimen from station 152, 

 Pacific North Equatorial Current; D, right lateral view of same showing ventral curvature 

 of antapical horns. 



E. Ceratium contrarium (Gourret) Pavillard. Four-celled chain from station 52, 

 near Easter Island. 



F-L. Ceratium massiliense (Gourret) Jorgensen. E, four-celled chain of form di- 

 verging toward C. contrarium . from station 52, south of Easter Island; F, two-celled chain 

 from station 152, Pacific North Equatorial Current; G, form with posteriorly extended 

 posterior horns, from station 143, central North Pacific; H, form simulating C. deflexum . 

 from station 18, Sargasso Sea; I, variety protuberans (Karsten) Jorgensen, from station 80, 

 eastern tropical Pacific; J, variant from station 37, Pacific Panama region; K, variant 

 from station 85, near Tuamotu Islands; L, variety armatum (Karsten) Jorgensen, from sta- 

 tion 25, Atlantic North Equatorial Current. 



178 



