DINOFLAGELLATA 233 



S. jolliffei (Murray et Whitting) (Fig. 105, e). 132^ by 92m; 

 California. 



Family 2 Dinophysidae Kofoid 



Genus Dinophysis Ehrenberg. Highly compressed; annulus 

 widened, funnel-like, surrounding small epitheca; chromato- 

 phores yellow; salt water. Several species. 



D. acuta E. (Fig. 105,/). 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 

 impressed; salt water. 



0. oxytoxoides K. (Fig. 105, g, h). 63-68ai by 15/^; off Alaska. 



Family 3 Phytodiniidae Klebs 



Genus Phytodinium Klebs. Spherical or ellipsoidal; without 

 furrows; chromatophores discoidal, yellowish brown. 



P. simplex K. (Fig. 105, i). Spherical or oval; 42-50/i by 30- 

 45m; fresh water. 



Genus Dissodinium Klebs (Pyrocystis Paulsen). Primary cyst, 

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

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

 8 Gymnodinium-like swarmers ; salt water. 



D. lunula (Schlitt) (Fig. 105, j, k). Primary cysts 80-155m in 

 diameter; secondary cysts 104-130/1 long; swarmers 22^ long; 

 widely distributed; British Columbia (Wailes). 



Fig. 106. a, Leptodiscus medusoides, X50 (Hertwig); b, Craspedotella 

 pileolus, XllO (Kofoid). 



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 

 suborder, the Cystoflagellata becomes a highly ill-defined group 

 and includes two peculiar marine forms: Leptodiscus medusoides 

 Hertwig (Fig. 106, a), and Craspedotella pileolus Kofoid (Fig. 106, 

 b), both of which are medusoid in general body form. 



