350 Janet ^¥ . Raff: 



which is parasitic in Rana esculenta, we see no resemblances at 

 all, and E. morula is fully four times the size. 



It resembles, however, the freshwater amoebae, such as A. 

 Umax, A. villosa and A, pilosa in being roughly distinguishable 

 into anterior and posterior portions, and in having specially 

 modified pseudopodia at the posterior end. These pseudopodia 

 vary in the different species, and help to form the specific dif- 

 ferences. These species are figured by Cash (1), and in his 

 description of A. limav he notes that Penard points out a 

 '■ peculiar habit of changing the direction of its march by a 

 movement of the anterior portion of the body ' en masse ' to the 

 right or left, whilst the posterior portion remains stationary." 

 This seems to show a resemblance to the peculiar way in which, 

 as I have already noted, E. morula can be anchored down by 

 the posterior portion. 



The figures on Plates I. and II. of A. villosa given by Leidy 

 (4) resemble very much the appearance of E. morula so far as 

 the anterior end of the animal is concerned, during locomotion, 

 but the posterior end is, of course, entirely different. 



Additional note on Entamoeba morula. 



Having completed this short paper, and still having a few 

 more Limnodynastes dor sails tadpoles, I examined again the 

 intestinal contents of four or five individuals and found 

 Entamoeha morula still present in large numbers, but a peculiar 

 point was noticed for the first time — namely, the presence of a 

 stiff process or flagellum-like organ situated at the anterior end 

 (Plate LXXI., Fig 8). It seemed to project from the body at 

 almost any angle, and was quite stiff and motionless. Only by 

 the protoplasm of the front of the body moving or rolling over 

 was the position of the flagellum altered. There generally 

 seems to be a slight extension of the protoplasm forming a tiny 

 conical projection which bears the flagellum. This is always 

 situated close to the nucleus and, in some cases, seemed almost 

 to be connected with it. The specimens which showed the 

 flagellum best were those that were advancing very slowly. 

 With close observation on those progressing rapidly, at first one 

 would say there was no sign of a flagellum being present, but in 



