6o 



ANURA 



CHAP. 



the ventml 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 fin (Discoglossidae, Felohates, Bufo), or it assumes 

 an asymmetrical position l)y tuniing to the right side {Hyla, 

 Ranci). 



Although both pairs of limbs begin to bud sinmltaneously, or 



Fifi. 11. — Tadpoles Oii Meijalopluniit hwnfana Iroiii l^iikit Besar, IMalay Peninsula, x 3. 



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

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

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

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

 •iyrinidae, while in the Laevogyrinidae it is generally pushed 

 tlirougli tlie left-sided spiracular opening, immediately behind 

 the outer gills. According to Barfurth the rig] it limb appears, 

 in about 80 per cent, of liana esculenta, from two to eight hours 

 before tlie left. 



