TRANSMISSION OT SARCOCYSTIS. 61 



which take place among unicellular animals, it is a possibility which 

 should not be entirely forgotten. 



Hei-petomonas possesses two nuclei, one larger or the main nucleus, 

 one smaller called the blepharoplast. From the latter two strands 

 of deeply staining material, the rhizoplasts, pass to the diplosome, 

 which consists of two deeply staining granules, from which the 

 double flagellum takes its origin (see Fig. 2), 



Even if, as indeed is very unlikely to be otherwise, Sarcocystis 

 has no connection with Herpetomonas, a flagellated stage might 

 well be present, as the structure of its spore rather indicates. 



Minchin,* in his article upon the Sporozoa, mentions the blow-fly 

 and also the burying-beetle as possible transmitters of Sarcocystis, 

 though he does not state how he supposes the infection to be carried 

 out in either case. From a consideration of the habits of the 

 burying-beetle it does not seem likely that this form transmits the 

 infection. The cockroach (Periplaneta) is far more likely to be the 

 second host if the blow-fly is not, since cockroaches, especially in 

 hot countries, are by no means particular as to their diet. 



Sporozoa in Lankestfer's Treatise on Zoology, 1903, p. 305. 



