BY T. H. JOHNSTON AND J. B. CLELAND. 



481 



tapering rapidly at the posterior end. The protoplasm, ex- 

 cept at the posterior end. where it was only slightly coloured, 

 was stained a deep blue. It appeared to be homogeneous in 

 most specimens, though a few large vacuoles were seen in 

 others. Granules were sometimes seen in the clearer area at 

 the posterior end. Lying in this region, was the kineto- 

 nucleus, which is sitxxated at about one-third of the distance 

 between the end and the centre, the large rounded nucleus lying 

 some little distance posteriorly from the centre. The undulat- 

 ing membrane was a rather wide, lightly staining structvire 

 possessing a folded edge. 



The measurements of some typical forms are given below. 

 Nos. i. to V. from Emydw'a krefftii (Queensland), and Nos. 

 vi. and vii., from Chelodina longicollis (South Australia). 

 The sizes are given in micromillimetres. 



1. 



Posterior end to kinetonucleus 5 



Kiiietonucleus to edge of nucleus . 12 



Length of nucleus 3"5 



Nucleus to anterior end 20 



Free flagelluin 6 



Total length (including fla£;ellum)... 46'5 

 Total length (e.xcluding flagelluni)... 40"5 



Greatest width I 6 "5 



Breadth of " body" opposite nucleus' 4 5 

 Breadth of undulating membrane ' 2 



8 

 11 



3-5 

 20 



42 5 



42-5 



6 



3-5 

 2-5 



10 

 4 



21 

 3 



46 



43 

 8 

 5 

 2' 



VII. 



6-5 

 10 



4 

 20 



3-5 

 44 

 40-5 



8-5 



5 



3-5 



H^MOCYSTiDiUM CHEL0DIN.S;, from Emydura krefftii Gray. 



(Plate xiii., tigs.l5--l.) 

 Dr. Bancroft kindly sent to us two blood-films taken during 

 April, 1910, from the freshwater-tortoise, Emydura krefftii 

 Gray, one taken at Enoggera, and the other at Petrie's Creek, 

 Queensland. An examination showed that the tortoise from 

 the latter locality was parasitised by hasmatozoa. We were 

 surprised at finding that the animal's blood harboured no 

 less than three quite different parasites, namely, a Trypano- 

 sonie {T . rlielodina), a Haemogregarine (//. clelandi), and a 

 Hsemocystidium (Johnston and Cleland, 1910, ]>. 679). We 



