6o 



ANURA 



CHAP. 



the ventral wall of the body ; the anus opens at the end of a 

 somewhat protruding tube, either in the median line, just in front 

 of the ventral tin (Discoglossidae, Felohates, Bicfo), or it assumes 

 an asymmetrical position by turning to the right side {Hyla, 

 Jiciiia). 



Although both pairs of limbs begin to bud simultaneously, or 



Fi(i. n.— Tadpoles of .)fe!/<(/(tjiln-i/s iiiontana from Bukit Besar, !Malay Peninsula, x 3. 



the fore-limbs even earlier, the hind-limbs are hurried on, and 

 appear first, long before the fore-limbs. The latter lie ready 

 l)eneath the skin of tlie gill-chamber, and the right always breaks 

 through the skin, wliile the left does the same in the Medio- 

 gyrinidae, while in the Laevogyrinidae it is generally pushed 

 through the left -sided spiracular opening, immediately Ijehind 

 the outer gills. According to Barfurth the right limb appears, 

 in iibout 80 per cent, of J^ana esculenta, from two to eight hours 

 before^ the left. 



