Protozoa Parasitic in Frogs, Part II. 351 



three or four instances, after close watching, the animal moved 

 into a certain position and the organ became visible. It may- 

 be that it is always present, but invisible owing to the fact that 

 during more rapid forward movement of the protoplasm it 

 becomes trailed underneath or above the anterior end of the 

 body. The fineness of the process and the granular nature of 

 the protoplasm prevented me from seeing it, excepting when 

 it was lying or directed away from the body. I have been 

 successful in killing and mounting only a few of these showing 

 the flagellum, and on examining again the specimens mounted 

 a few weeks ago, on which, along with the living animal, the 

 first description was made, I can see no trace whatever of the 

 organ. It may therefore be present at certain times only. In 

 killing and mounting, however, as it is so very fine, it might 

 easily be lost. 



The individuals just examined possessing this flagellum had 

 very few posterior pseudopodia, and sometimes none at all. The 

 streaming was generally very rapid, and in some specimens there 

 seemed to be a small portion at the extreme anterior end irito 

 which the protoplasm did not flow (Plate LXXT , Fig. 9). In this 

 portion the nucleus was situated. 



LITERATUEE. 



Same as in Part I., and in addition. 



1. Cash. — " Some new and little known British Freshwater 

 Rhizopods." Jour. Linn. Soc, London. Zoology 29, 1904. 



" British Freshwater Rhizopods and Heliozoa," vol. i., Rhiz., 

 Part I., for the Roy. Society, London, 1905. 



2. Doflein, F. — Lehrbuch der Protozoenkunde, 1909. 



3. Lankester, E. Ray.— A Treatise on Zoology, Part I. The 

 Lobosa, by Prof. S. J. Hickson, M.A., F.R.S. 



4. Leidy, J, — Freshwater Rhizopods of North America, In. ; 

 U.S. Geol. Survey of the Territories. Vol. 12, 1879. 



5. Raft", J. W. — •' Protozoa Parasitic in the Large Intestine of 

 Australian Frogs." Part I. Proc. Roy. Soc. Victoria, vol. xxiii., 

 N.S. Pt. IL, 1911. 



6. Walker, E. L. — " The Parasitic Amoebae of the Intestinal 

 Tract of Man and Other Animals." Jour. Med. Research, vol. 

 17 (N.S., vol. 12), 1907. 



