i90().] 



SYSTEM OF CERTAIN SPECIES OF ANURA. 



1027 



Tlie r. c'/doininis iniemns, in Jill but Ji. esealenta, curved for- 

 wards ()\-er the Mwi. ohliqivas externas and ohliquus internus. 



In A', escidenta this artery went to the oviduct, and appeared to 

 give no bi-anch at all to the muscles of the abdominal wall (text- 

 fig. 150, p. 1924). In H. catesbiana it formed on the right side 

 of the body a very distinct anastomosis with the fourth r. ahdo- 

 miiialls of the A. vertehralis dorsi. 



Text-fif^ 152. 



c.f.l^ 



JRana clamata, $ (X 2). 



Ventral view of Aa. urogenitales, &c. 



(For explanation of the lettering, see p. 1033.) 



The A. recto -veslcalis arose by a single branch in all but 

 Ji. escidenta, whei-e it occuri'ed as three sepaiute offshoots from the 

 main stem. In a specimen of H. temjioraria the three branches 

 of the epigastrico-vesicalis arose simultaneously. 



The A.femoralis arose in all cases shortly after the above ar-tery. 

 In R. hexadactyla, on one side, the two were contiguous, though 

 distinct from one another at their oiigins (text-fig. 149, p. 102.3). 

 The branches of this artery are subject to much variation in their 

 arrangement and distribution, and there is some difiiculty in com- 

 paring the species with one another. There was, however, in the 



