log 



If the mid-gut has been removed in'toto, and 

 the preparation not too much compressed, the 

 following appearances are seen : — 



1. The narrow anterior portion of the mid- 

 gut, with the calyx-like proventriculus at its free 

 end. 



2. If a portion of the extremely thin mem- 

 brane of the true oesophagus or its diverticula be 

 included in the preparation, it will probably be 

 seen to exhibit peculiar markings, due probably to 

 muscular fibres in the membrane, but resembling 

 rather closely sporozoits. It is essential that this 

 structure should be recognized when seen, and 

 that the resemblance of its markings to sporozoits 

 should not lead the beginner astray (Fig. 32). 



Al»it/t|iljyii 



f|>Jiriiw 



(^ilecL Cni Ci/i 





Fig. 31. Microscopic appearance of Mid-gut, shewing 

 Cell Structure and Zygotes 



3. The expanded posterior portion of the 

 mid- gut. This body forms the main mass of the 



