PLATE XV. 



FA VI A FRAGUM (Eaper). 



Fig. 113. — Transverse section through the stomodaeal region of a larva after six hours' extrusion. Two pairs of 



mesenteries are here complete. X 200. 

 Fi<;. 114. — Transverse section through the same larva, a little below the stomodaeal region. Two additional pairs of 



mesenteries i IV, IV; V, V) are developed at this level, but no trace of a sixth pair. X 200. 

 Fit;. 115. — Transverse section of a somewhat older larva. Three pairs of mesenteries are here complete, and the 



fourth and fifth pairs extend higher than in the last larva. X 200. 

 Fio. 116. — Transverse section of the same larva a little below the stomodaeal region. Six pairs of mesenteries are 



now present, filaments occurring on the first three developmental pairs. X 200. 

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