374 JAMES W. MAYOR. 



where tufts of fine short pseudopodia come off, a condition 

 which was found even in the smallest of the pseudopodia, PI. I., 

 Fig. i. In all the plasmodia a clear differentiation into ecto- 

 plasm and endoplasm could be seen, but evidence of the meso- 

 plasm was not found, which was also the case in the parasite 

 recorded from the Georgian Bay (Mavor, I9i6b). The yellowish 

 globules indicated by clear circles (PI. I., Figs, i, 3, 4) showed 

 their probably oily nature by flowing together in plasmodia which 

 had remained in the excised and decomposing urinary bladder 

 for about 40 hours. Crystals of a haematoid nature were of 

 rather rare occurrence and were found only in the smaller plas- 

 modia and of these usually only in those not containing spores. 

 The spores occur in the plasmodia in pairs and lay so that 

 their concave surfaces are in juxtaposition (PI. I., Figs. 2 and 4). 

 The shape of the spores of this species has been described by 

 Butschli (1882), Thelohan (1895), Cohn (1896), and Mavor 

 (i9i6&). It is that of a spindle slightly curved so that when 

 viewed from the side (PI. I., Fig. 2), the spore appears crescent- 

 shaped. The surface of the spore is marked with longitudinal 

 striations converging toward the ends. The polar capsules are 

 situated at either end of the spindle and each occupies rather 

 less than one third of the length of the spore. In the preparations 

 studied by the author, the polar filaments can be easily seen 

 within the capsules in the fresh state as a spiral of four or five 

 coils. They were extruded under the action of concentrated 

 sulphuric acid but remained in the capsules when treated with 

 a solution of iodine in potassic iodide and when treated with 

 ammonia water. The sporoplasm occupies the central portion 

 of the spore and contains two or more highly refractive bodies 

 thought to be nuclei. The average dimensions of ten spores 

 were found to be: 



Length 18-19 /* 



Width 5-6 M 



Length of Polar Capsules 5 /j, 



Width of Polar Capsules 2.5-3.0 ^ 



Length of polar filaments 40-45 M 



