1<»2 Givynneth Buchanan : 



Reptiles. (Plates XVIII. and XIX.; Figs. 18-33.) 



Red Corpuscles. — The founts of the absolute number of red' 

 cells varied, probably due to the effect of different seasons. For 

 instance, Ghelodina longicollis would not give enough blood for 

 a haemocytometer count when pricked in May, apparently because 

 the animal was then hibernating, and the estimation of its cells 

 could nor be made until it was killed in July. 



The red corpuscles varied in size, the largest observed being found 

 in Ghelodina longicollis, and measuring 21.9/* x 13.3//, which is- 

 a larger reading than that given by Cleland and Johnston (3), 

 viz., 18.5/* - 19.5/4. x 12.5/*. The increase in size in young forms 

 as compared with adults of the same species characteristic of 

 batrachia, is no longer apparent, except in Tiliqua scincoides, 

 which ranked next in size to Ghelodina longicollis ; but for pur- 

 poses of comparison I was not, in this case, able to obtain the 

 adult. My measurement (19/x x 10.3/*.) is, however, a slightly 

 larger trading than is given by Cleland and Johnston for the 

 same form (presumably adult). In one case, Til. nigra-lutea, the 

 cells varied enormously, running from 19.9/* x 1 1 6/* to 

 9.9/* x Q.6/JL ; and in Gramatophora barbata there were some small 

 round cells, appearing normal in reaction to stain (microcystes), 

 while in Trachydosaurus rugosus these small forms were also 

 observed, hearing in this case a very darkly staining nucleus. 

 Anaplastics were common in the cell of Chel. longicollis, while others 

 showed different stages of vacuolation, and variously disintegrated 

 structures, closely resembling those of Hyla aurea were found. In 

 other cases the rvil cells seemed to be losing their nuclei, e.g., in 

 Tiliqua scincoides (10). In some the nuclei of the ordinary forms 

 tended to become irregular, with a distinct appearance of budding, 

 and in the young specimen of Gramatophora muricata one was 

 observed in a state of division. The reaction to stain was fairly 

 normal, but in some the cytoplasm of ordinary red tells took on 

 a green tinge with .lenner. 



I' 1 reptiles, in distinction to batrachia, the larger forms 

 of leucocyte approach more nearly the size of erythrocytes, the 

 largest observed being the eosinophil cells of Chd longic, which 

 measured 21.5/i. Spindle cells were very common in all speci- 

 mens, and might he pointed out at one or both ends. They 

 rather inclined towards basophil characteristics, and among such 

 cells binucleate forms were fairly numerous, as well as among the 

 ordinary spin, lies. I„ the young Tiliqua scincoides. in which 



