260 



PROTOZOOLOGY 



porulate; chromatophores yellow to dark brown, often dense; with- 

 out stigma; fresh, brackish or salt water. Numerous species. 



G. polyedra Stein (Fig. Ill, c). Angular, polyhedral; ridges along 

 sutures, annulus displaced 1-2 annulus widths, regularly pitted; salt 

 water. "Very abundant in the San Diego region in the summer 



Fig. 111. a, Dolichodinium lineatum, X670 (Kofoid and Adamson); 

 b, Goniodoma acuminata, X340 (Stein); c, Gonaulax polyedra, X670 

 (Kofoid); d, G. apiculata, X670 (Lindemann).; e, Spiraulax jolliffei, 

 right side of theca, X340 (Kofoid); f, Dinophxjsis acuta, X580 (Schutt); 

 g, h, Oxyphysis oxytoxoides, X780 (Kofoid); i, Phytodinium simplex, 

 X340 (Klebs); j, k, Dissodinium lunula: ], primary cyst (Dogiel); k, 

 secondary cyst with 4 swarmers (Wailes), X220. 



plankton, July-September, when it causes local outbreaks of 'red 

 water,' which extend along the coast of southern and lower Cali- 

 fornia" (Kofoid, 1911). 



