106 HANDBOOK OF PROTOZOOLOGY 



under suitable stimulation. A binucleate colony composed of 

 four individuals measures about 110 microns long. Marine. 



Suborder 3 Cystoflagellata Haeckel 



Since Noctiluca which has been for many years placed in 

 this suborder, is removed, according to Kofoid, into the second 

 suborder, the Cystoflagellata become a highly ill-defined group. 

 It includes two peculiar marine forms: Leptodiscus medusoides 



Fig. 36 a. Leptodiscus medusoides, profile. X50 (After Hertwig). 

 b. Cr as pedotella pil coins. X 110 (After Kofoid). 



Hertwig (Fig. 36, a), and Craspedotella pileolus Kofoid (Fig. 

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



References 



Chatton, E. 1920 Les Peridiniens parasites; morphologic, 



reproduction, ethologie. Arch. Zool. Exper., T. 59. 

 Kofoid, C. A. 1906 On the significance of the asymmetry of 



the Dinoflagellata. University of California Publ. Zool., 



Vol. 3. 

 . 1920 A new morphological interpretation of Noctiluca 



and its bearing on the status of Cystoflagellata. Ibid., 



Vol. 19. 

 Kofoid, C. A. and Olive Swezy. 1921 The free-living un- 



armored dinoflagellata. Mem. Uni. California, Vol. 5. 

 Lebour, Marie V. 1925 The dinoflagellates of northern 



seas. London. 

 Pratje, a. 1921 Noctiluca miliaris Sur. Arch. f. Protistenk., 



Vol., 42. 

 Schilling, A. 1913 Dinoflagellatae (Peridineae). Siisswas- 



serflora Deutschlands. etc. H. 3. 



