NASO-LABIAL GROOVE OF LUNGLESS SALAMANDERS. 5 



often difficult to distinguish in sections between the narrow ducts 

 of these glands and those of the large acinous glands (<?<) with 



st m 



st 



FIG. 3. Transverse section through left naso-labial groove of adult Desmogna- 

 thits fusca, X 2 37-5- &* blood vessels; r, connective tissue underlying' the naso- 

 labial groove ; dac, duct of acinous gland ; <////, duct of naso labial gland ; /, papilla 

 upon the surface of which the naso-labial gland opens ; s/c, stratum corneum ; stm, 

 stratum mucosum. Other designations as in Fig. 2. 



nl 



FlG. 4. Horizontal section through right side of head of a small adult, Desmog- 

 nathus ftista, X 4 2 - Designations as in previous figures. The second gland (/ 2 ) 

 is cut through the portion which runs for a short distance parallel to the groove and 

 just beneath it (cf. Fig. 5). 



