DINOFLAGELLATA 261 



G. apiculata (Penard) (Fig. Ill, d). Ovate, chromatophores yel- 

 lowish brown; 30-60;* long; fresh water. 



Genus Spiraulax Kofoid. Biconical; apices pointed; sulcus not 

 reaching apex; no ventral pore; surface heavily pitted; salt water. 



S. jolliffei (Murray and Whitting) (Fig. Ill, e). 132^ by 92^; 

 California. 



Family 2 Dinophysidae Kofoid 



Genus Dinophysis Ehrenberg. Highly compressed ; annulus wid- 

 ened, funnel-like, surrounding small epitheca; chromatophores yel- 

 low; salt water. Several species. 



D. acuta E. (Fig. 111,/). Oval ; attenuated posteriorly; 54-94/i long; 

 widely distributed; British Columbia (Wailes). 



Genus Oxyphysis Kofoid. Epitheca developed; sulcus short; sulcal 

 lists feebly developed; sagittal suture conspicuous; annulus im- 

 pressed; salt water. 



0. oxytoxoides K. (Fig. Ill, g,h). 63-68/1 by 15m; off Alaska. 



Fig. 112. a, Leptodiscus medusoides, X50 (Hertwig); b, Craspedotella 

 pileolus, XllO (Kofoid). 



Family 3 Phytodiniidae Klebs 



Genus Phytodinium Klebs. Spherical or ellipsoidal; without fur- 

 rows; chromatophores discoidal, yellowish brown. 



P. simplex K. (Fig. Ill, i). Spherical or oval; 42-50/i by 30-45/i 

 fresh water. 



Genus Dissodinium Klebs {Pyrocystis Paulsen). Primary cyst, 

 spherical, uninucleate; contents divide into 8-16 crescentic second- 

 ary cysts which become set free; in them are formed 2, 4, 6, or 8 

 Gymnodinium-like swarmers; salt water. 



D. lunula (Schutt) (Fig. Ill, j, k). Primary cysts 80-155/1 in 

 diameter; secondary cysts 104-130/i long; swarmers 22/i long; widely 

 distributed; British Coumbia (Wailes). 



Suborder 3 Cystoflagellata Haeckel 



Since Noctiluca which had for many years been placed in this 

 suborder, has been removed, according to Kofoid, to the second sub- 

 order, the Cystoflagellata becomes a highly ill-defined group and 



