FIGURES 17 and 18 



Fig. 17. A-C. Ceratium declinatum Karsten. A, short-horned form of variety 

 anpjsticornum . from station 37, Panama region of Pacific; B, long-horned form of var. 

 angusticornum from the Pacific, station 54; C, similar form from the Atlantic, station 18. 



D-G. Ceratium gibberum Gourret. D, typical form of the species, from station 95, 

 region of Samoa; E, chain of tvro cells, from station 48 north of Easter Island; F, form 

 subaequale Jorgensen, from station 114, off Japan; G, variant of main species with elongated 

 and nongibbous body, from off west coast of Panama, station 37. 



H-I. Ceratium concilians Jorgensen. H, typical form from station 118, northeast of 

 Japan; I, form with more regular horns corresponding to f. subaequale of C. gibberum . 

 from station 130, off California. 



J-N. Ceratium lunula Schimper. J, brachyceros form from Atlantic, station lb; K, 

 chain of two cells showing regeneration of antapical horns, from station lb; L, magaceros 

 form with widely spreading horns, from station 158, central tropical Pacific; M, magaceros 

 form with extremely long antapical horns, from station 40, off Ecuador; N, heavy-walled 

 magaceros form from Atlantic, station 2. 



Fig. 18. A-C. Ceratium carnegiei n. sp. A, from station 158, northeast of Samoa. 

 B and C, from station 151, southeast of Hawaii. 



D-N. Ceratium contortum Cleve. D, from station 148, between Hawaii and the United 

 States; E, from station 88, near Tahiti; F, from station 1, Gulf Stream; G, from station 

 107, near Guam; H, from station 156, northeast of Samoa; I, from station 148, between 

 Hawaii and the United States; J, from station 138, near Hawaii; K, from station 131, off 

 California; L, from station 26, Atlantic North Equatorial Current; M, from station 103, 

 north of the Marshall Islands; N, from station 52, southeast of Easter Island. 



174 



