346 Janet W. Raff: 



sent abnormal individuals of 0. hinuchata, as for instance (a), 

 (b), (c), (d) and perhaps (f) ; but others seem to be inter- 

 mediate forms which are not sufficiently defined to identify. 



Entamoeba morula, n. sp. 



This new species is found in great numbers along with 

 Nyctotherus, OjKilinae, Trirhomonads and Ei(r/le?ioids, in the 

 large intestine of tadpoles of Limnodynastes tnsmcmiensis and 

 others. I have not been able to ascertain in all cases the exact 

 species of tadpole, but from the several localities from which 

 they were obtained, as well as from their appearances, I should 

 judge them to be, in addition to L. tasmaniensis, probably L. 

 dorsal is, Hyla uurea and others. I have also found the animal 

 on three different occasions, but in far smaller numbers, in the 

 large intestine of frogs belonging to the species H. aurea, from 

 Alexandra, Victoria ; H. lesueurii, from Gippsland, Victoria ; 

 and H. peronii, from New South Wales. The following is a 

 de<scription of the amoeba as it appears directly it is taken from 

 the large intestine and examined under the microscope. The 

 amoeboid stage is roughly cylindrical and is distinguishable into 

 a large elongated oval anterior portion, and a small posterior 

 portion which is continually sending out rounded pseudopodia 

 which are mulberry-like in appearance (Plate LXXI., Fig. 1 ). It is 

 in these posterior pseudopodia, as well as in its habitat, that 

 E. morula differs mainly from other allied forms. This new 

 species is exceedingly active, and creeps along at a remarkable 

 rate, only rarely remaining stationary. The average length is 

 about r25/u,, and the average breadth about one-third or one- 

 quarter of its length, but as the shape changes quickly it is 

 difficult to make accurate measurements. I measured one indi- 

 vidual that was killed in osmic vapour and mounted in glycerine, 

 that reached lG6/x. The protoplasm is only rarely (see below) 

 clearly differentiated into ectoplasm and endoplasm, the con- 

 tents being as a rule scattered evenly throughout the body, 

 excepting in the small posterior region, which is generally free 

 from the larger granules. A very finely granulated appearance 

 is generally seen in this portion, but at times it appears quite 

 homogeneous and jelly-like. There is a single large nucleus 



