316 



INEZ WHIPPLE WILDER. 



In addition to the integumental glands, the development 

 of two other sets of glands must be noted among the premeta- 

 morphic changes, the intermaxillary and the lingual glands. 

 The former is an unpaired gland and is present indeed throughout 

 larval life (int, Fig. 18) as a single, slightly convoluted tube 



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Tt;"' 



FIG. 21. Sections for comparison of the eye and its surroundings in the larva! 

 and adult stages of Desmognalhus fusca; (a) transverse section through the left 

 eye of a larva; (b) transverse section through the right eye of a recently meta- 

 morphosed adult; (c) horizontal section through the ventral region of the eye of the 

 larva; (d) horizontal section through the ventral region of the eye of a recently 

 metamorphosed adult. Ac, acincus glands; eyl, eyelids; or, orbital glands; rt, 

 retina; sn, sense organs of the integument. Drawn with Abbe camera. X 60. 



