123 



Note that these latter show various stages of 

 development in the different mosquitoes. Note 

 that each consists of an outer layer of small 

 cubical cells (follicular epithelium) and an inner 

 mass composed of from four to eight large cells. 

 Note the first appearance of the yelk as small oil 

 globules in the lowest cell (the ovum), and how 

 this increases until it nearly fills the follicle by 

 encroaching on the other cells (nurse cells). 



Observe in, the mature ovum that the outer 

 covering is formed of the original layer of outer 

 cells (follicular epithelium). 



ot(;.i/..v.3<„ 



lM.j. 



'7 "''■''^o.j^a. 





Fig. 40. Protozoa other than the Malarial Parasite 

 found in Anophelines 



The following organisms may be found in 

 mosquitoes apart from the various stages of the 

 malarial parasite : — 



I . Encysted Trematodes, mostly found in the 

 tissues, near the neck ; also free in the stomach. 



