PLATE XXIII. 



Fig. 6. Ventral view of Ceratium calif orniense, sp. nov. X 155. 



Fig. 7. The same of another individual. X 155. 



Fig. 8. Ventral view of individual with abnormally long horns showing 



distal zone of recent growth in apical horn and proximal zones in the 



antapicals at points marked by asterisk. X 450. 

 Fig. 9. Dorsal view of same. X 450. 



[320] 



