FIGURES 13 and 14 



Fig. 13. A-D. Ceratium fusus (Ehr.) Duj. A, enlarged dorsal view of specimen shown 

 in D; B, specimen from warm Pacific, station 35; C, specimen from cold North Pacific re- 

 gion, station 123; D, specimen from cold Atlantic, station 11a. 



E-K. Ceratium tripos subsp. atlanticum (Ostenfeld). E, from station 39, off Ecuador; 

 F, from station 61, southern part of southeast Pacific region; G, from station 118, northeast 

 of Japan in cold North Pacific region; H, from station 43, region of Gals^agos Islands; I, 

 from station 6h, North Sea. 



L-N. Ceratium triuos subsp. semipulchellum (Jorgensen). L, from station 68, south- 

 east Pacific region; M, from station 46, southeastern part of warm Pacific region; N, from 

 station 1, Gulf Stream of Atlantic. 



Fig. 14. A, Ceratium humile Jorgensen, from station 1, Gulf Stream. 



B-F. Ceratium pulchellum Schroder. B, long-horned form resembling semipulchel- 

 lum , from station 15, warm Atlantic; C, wide form from station 63, southeast Pacific; D, 

 typical form from station 138 northeast of Hawaii, warm Pacific; E, from station 19, warm 

 Atlantic; F, from station 87, near Tuamotu Islands, warm Pacific. 



G-P. Ceratium breye (Ostenfeld and Schmidt) Schroder. G, from station 41a, near 

 Galapagos Islands; H, two-celled chain from station 35a, Panama region (shows a transition 

 between the curvulum and parallelum types); I, form similar to C. schmidtii Jorgensen, from 

 station 150, warm Pacific; J, specimen from station 91, intermediate between the schmidtii 

 form and the typical breve: K, open form resembling C. arcuatum , from station 16, warm 

 Atlantic; L, from station 105, western warm Pacific; M, from station 30, warm Atlantic; 

 N, from station 24, warm Atlantic; O, from station 16, warm Atlantic; P, another specimen 

 resembling C. schmidtii . from station 35, Panama region. 



170 



