56 



The Larva of Chironomiis 



we believe, from the junction of tlie meso- and meta- 

 tliorax on the ventral surface, are inserted into the fore 

 part of the chamber (fig. 41) ^ The outer surface of the 

 succeeding part of the stomach is studded over by very 

 numerous prominences, which bulge out between the 

 crossed fibres of the muscular coat, being covered only by 



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Fig. 41. — I, cardiac chamber 

 of stomach of larva, showing 

 its three tiers of caeca. 2, 

 transverse section of fore part 

 of stomach, showing the epi- 

 thelium, and the food enclosed 

 in a peritrophic membrane. 



Fig. 42. — Epitheliuni of larval .stomach. 

 I, 2, from middle ; 3, from fore end. \vi. i the 

 striated seam can be observed around the 

 island-like iolds of epithelium; in 3 the 

 nuclear figures are shown. 



a thin connective-tissue layer. They are not caecal pro- 

 cesses but solid outgrowths, consisting each of a single 

 epithelial cell, or parts of two such cells ; when seen in 

 face they form a tolerabl}^ regular mosaic. Before the 

 middle of the stomach is reached these prominences 



' Similar muscles are found in (ho crane-fly larva. 



