514 MEMOIKS OF THE UNIVERSITY OF CALIFORNIA 



9. Structural differentiations of the areas bordering the girdle and sulcus, 

 with or without torsion, appear in the pseudopodia of Gymnodiniion zachariasi, 

 the ephemeral ( '?) tentacle of G. pseudonoctUiica, the tentacle of XoctiJuca, the 

 incipient prod of Proterythropsis, and the highly develoiied prod and its enclos- 

 ing chamber in Erythropsis. There is also a tendency for pigment to aggregate 

 in the margins of the girdle, for the stigma to appear in the sulcus, and for the 

 ocellus to lie adjacent to the girdle. 



10. There is an orthogenetic evolution of the ocellus in the genera Protopsis, 

 Pouchetia, Proterythropsis, and Erythropsis, by the integration of scattered 

 pigment granules and loosely aggregated lens bodies into a compact melano- 

 some enclosing a red sensory core at the base of concentrically laminated, 

 spherical lens. 



11. Nematocysts are formed in Polykril-os and Nematodiniiou. The}' are 

 derivatives of the centrosome or cell center. 



12. There is an extraordinary range in color of the GAnimodiuioidae. The 

 simpler forms are gi-een, yellow, or brown, while the colors of many of the moi-e 

 complex ones are near the red end of the spectrmn. 



13. Holozoic nutrition occurs in most of the genera and is ahnost exclu- 

 sively prevalent in those of a higher t}i)e. The sulcus is the cytosome. 



14. Noctihica belongs in the Gymnodinioidae. It has a sulcus, the so-called 

 atrium and rod organ, a rudhnentary girdle, heretofore undetected, and the 

 transverse flagellum is present in a rudimentary condition in the so-called tooth. 



15. The Cystoflagellata, as defined by Haeckel, should be reduced to contain 

 only Leptodiscus and Craspedotella, pending the analysis of theii' affinities when 

 their life historv shall be discovered. 



