SIGNIFICANCE OF PREHALLUX AND PREPOLLEX. 

 Plate I. 



.4. Rana papua. /■'. Hyhi i.i luhii. C. Liinnodynastes tasmaniensis. 



D. Xotaden bennetti. E. Hyla peronii. F. Adelotis brevis. 



Radiographs of tlie Anuran Pes. 



\ I ! 



111// 



^ > II / 



ml 



ph 



\ M ; / 

 •\ 1 / / 



> ' // 



-\ \ I / / 



\lll// 



• • • • • 



\'. // 



\!!// 



Diagrams illustrating the fate of the first Metacarpal and Metatarsal 

 according to the Prehallux Theory. 

 A.B. Hypothetical hepta- and hexadactyle stages, of which A is more primitive 

 than B. Probably, in each instance, some of the digits were provided 

 with more than three phalanges. 



C. Primitive pentadactyl condition. 



D. Metacarpal (or metatarsal) of first digit displaced — prepollex (or prehallux). 



E. Typical pentadactyl manus (or pes). 



mc 1. First metacarpal or metatarsal. In D it represents the prepollex or 

 prehallux. 

 pli 1, ;)7i 2, ph 3, First, second, and third phalanges respectively. 



