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University of California Publications in Zoology [Vol. 16 



outline, with four equal flagella at the rounded anterior end. The 

 distinguishing characteristic was that "auf der Korperoberflache be- 

 nierkt man eine verschiedene Anzahl dunkler und verschieden langer 

 Striche, die Grassi fiir trichocystenartige Gebilde zu halten geneigt, 

 wahrend sie Kunstler fiir Rippen der Obertlache erklart. ' ' 



Mackinnon (1912) describes a flagellate from the larva of the 

 crane-fly Tipula which she places in the genus Polyniastix. In this 

 the periplast is raised up in longitudinal ribs which in the living 



nuc.rhiz\ 



Polymastix hufonis (Dobell) from the intestine of the salamander Diemyc- 

 tyJus torosus. X 3100. bleph., blepharoplast ; fl., flagella; nuc, nucleus; nuc. 

 rhiz., nuclear rhizoplast; par. h., parabasal body; par. rhiz., parabasal rhizoplast; 

 St., striations in the periplast. 



organism appear to run almost unbroken from one end of the flagellate 

 to the other, but are found to be discontinuous on staining. 



Hamburger (1911) describes the flagellate from the larva of 

 Melolontha, the periplast of which is raised into longitudinal ribs 

 extending from one end of the organism to the other. Both Ham- 

 burger and Mackinnon figure forms in which the "ribs" of the peri- 

 plast become detached from the body and apparently fall oft". The 

 suggestion has been made, however, that this appearance may be due 

 to bacteria. It does not occur in the species which I have had under 

 observation. 



