AiuUoiiiy of J/ijl(t aarea. 361 



•t + •") + <), IJut'o cinereus, synimetiicjil. Adolphi, '98, tig. 3 



7 + S H;ui;i mugieus, not ,, Beiiliam, '94, tigs. 1, '2 



8 + 9 liana esculeiita ,, Howes, '93, fig. 1 



Cole, '01, fig. 4 

 ,, ,, ,, ,, iiidewood, '02, p. 46 



8r9 Pelobates fuscus ,, Adolpiii, '95, figs. 10, 11 



S + ui-ostyh; Bufo cinereus ,, ,, Adolpiii, '98, figs. 5,6,7,8 



8 + 9 + urostyle, 



Bufo variabilis, nearly ,, .\dolphi, '93, fig. 4 



,, ,, pantherinus ,, ,, Uenhani, '94, fig. 16 



9 + urostyle, 



Bufo variabilis ,, A(lol})lii, '93, figs. 6, 7 



9f 10 f (?)ui-ostyle 



Pelobates fu.scus ,, ,, Adolphi, '95, figs. 2, 3, 



4, G, 7, 8 

 From this table it is easily seen that the fusion of vertebrte 

 2, 3, 4 and 5. in individual (V) of Hyla is somewhat more 

 extensive, resulting in greater distortion and loss of parts, 

 especially as involving one of the condyles of the skull, and the 

 2nd and 3rd transverse processes, and the left side of the bodies, 

 resulting in a shortening of the whole vertebral column. The 

 curious arrangement found in (W), (see PI. xix., Fig. 1), whereby 

 each vertebra from 2-8 carries a transverse process belonging 

 on the left, apparently to the vertebra behind, as well as its 

 own on the right, is comparable in part with that shown by 

 Benliam ('94, Figs. 1 and 2), though brought about in a different 

 manner. There is there, however, no interference with the 

 arrangement of the sacral processes, such as we find here. In 

 this respect this specimen of Hyla may rather be compared with 

 the vertebral column figured by Adolphi ("98, Figs. 7 and 8), 

 though not exactly similar even to that, the body of vertebra 

 9 being in that case still distinguishable from the urostyle, while 

 here it is completely fused. The position of the sacral processes 

 on 8 instead of on 9. as seen here in (X) and (Y), may be com- 

 pai-ed with Adolphi's (98), Fig. 5, though there the 9th is indis- 

 tinguishable from the urostyle, while here it is not in any way 

 fused. A similar disjunction is seen in the spOLimen of Rana 

 ti III i)t)r(iri(i. quoted by Lloyd Morgan (Nature, vol. 35, p 53). in 

 which the right sacral process is carried by the 9th vertebra, 



