454 On Transmission of Proteosoma to Birds by the Mosquito. 



a development in the mosquito of Proteosoma in birds ; and to judge 

 from their structure and mode of growth so far as yet observed, I 

 take them to be coccidia" he is using the generic term " coccidium," to 

 describe some phase in the growth of the species of a distinct genus, 

 Proteosoma. 



Apparently, what Major Ross intends to indicate by the term 

 " coccidium " is an ovoid firmly walled corpuscle which increases in 

 volume from about 1 /2000th inch in length to four or five times that 

 size, and then breaks up into a mass of filiform spores radiating from a 

 central granular mass. 



In this mode of spore formation these bodies have resemblances to 

 the true coccidia, which present themselves not only as oviform cor- 

 puscles but as cysts with sickle-shaped or filamentous spores. It is, 

 however, not legitimate to apply the generic term " coccidium " to a 

 phase of growth of another genus. LISTER, Chairman of the Malaria 

 Committee.] 



