i6 



RESEARCH IN PROTOZOOLOGY 



three or four days. The amoebae may be found either on the 

 external surface or in the enteron, but they are primarily ecto- 

 parasites. 



Furthermore these authors found certain differences in the 



Fig. 3. — Costia necatrix. A, side view showing two long and two short 

 flagella. B, as seen from edge. X iioo. (From Pascher and Lemmermann 

 after Lemmermann.) C, Chilodon cyprini, ventral view showing nucleus, two 

 vacuoles, etc., X ca. 700. (After Moroff.) D, C. cyprini, optical section show- 

 ing pharyngeal basket, X ca. 580. (After Moroff.) E. C. megalotrochce, 

 showing nucleus and seven vacuoles, X 430. (After Stokes.) F. Cyclochceta 

 spongillce. Note crown of setae exterior to cilia, X 290. (From Kent after 

 Jackson.) G, Trichodinopsis paradoxa, (w), macronucleus ; (c), cytostome, 

 X 145. (From BiitschH after Claparede and Lachmann.) 



structure of the nucleus from the condition described by Entz. 

 The question as to the identity of the two species arose, but the 

 evidence at hand v^^as considered inadequate to justify the erection 

 of a new species ; but a new genus was created to contain this 

 species. Since the publication of this paper by Reynolds and 

 Looper the author has exchanged letters and prepared slides with 



