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197 



diameter and about twenty in number. Nothing further is 

 known of the breeding habits and development. 



(2) C. d. a. One of the most remarkable modes of nursing 

 is that of the Chilian Rhinoderma darwini, a small frog of the 

 family Engystomatidse It was first believed to be viviparous, 

 but a more careful examination revealed the fact that the young, 

 about ten to fifteen in number, are sheltered and develop in 



Fig. 16. — A, Rhinoderma darwini external appearance. B, A specimen of 

 the same with the gular sac cut open, showing contained embryos. 



the gular pouch (the modified vocal sac with which the males 

 of many Tailless Batrachians are provided) of the father, which 

 pouch extends over the entire ventral side. (Fig. 16.) No 

 gills or other breathing organs have been observed, and the 

 tail, which is never large, is absorbed before the young leaves 

 the paternal pouch. We do not know how the young get into 

 the pouch, but it is highly probable that the male takes the 

 eggs into his mouth as soon as they are deposited and, with 



