322 



L WER VEll TEBllA TES. 



contemporary types as in the Batrachia Anura, but it is none the less universal. The 

 kind of parallelism usually observed is that in which there is only a partial resem- 

 blance between adults of certain animals and the 

 young of others. 



The metamorphoses of these animals have been 

 already referreel to, and further details on the sub- 

 ject will be found under the heads of the respective 

 species. I will only note here that while the ma- 

 jority of the Anura undergo a complete metamor- 

 phosis, a few pass through the branchial stage while 

 still in the egg {ffi/lodes martinicensis), and other 

 forms carry the young in various ways until this 

 period is passed ; {genera Pipa, Nototrema, Opis- 

 thodelphi/s). 



Fig 191 — \ototjema marsuptatum with 

 the blood pouch cut open to show the 



Srit-OKDEii I. — Aglossa. 



"^^ ■ There are two families of this sub-order, one of 



which has no teeth — the Pipida;, and the other has teeth in the upper jaw — the 

 Xenopodidae. In both of them the vertebra3 are opisthocojlous ; that is, they are ball- 

 and-socket jointed, with tlie ball in front and socket behind. The longitudinal epi- 



FiG. 192. — Skflt'tou of JCenojms ; coi\ coracoid 



coracoid cartilages of opposite sides are distinct, but do not overlap as in Arcifera. 

 The sacral transverse processes are much expanded, and are coossiiied with the coccy.\ 

 (Fig. 192). The larvae differ from those of other Anura in having two branchial 

 openings (sjnracula), one on each side. 



The family Pipid^e has the skull completely ossified. It includes but one genus, 

 Pijxt, which is only known as existing in South America. The sole species, Piini 

 americana, is of rather large size, and of exceedingly depressed form. The terminal 

 phalanges are pointed, and the ends of the fingers terminate each in four dermal 



