304 Journal of Comparative Netirology. 



TABLE IV. 



Tabulation of the muscular, cutaneous and articular nerve branches 

 to the shank in Frog II B. 



Muscular branches. 



From the Tibial nerve. No. of branches. 



Plantaris longus. 2. 



Tibialis posticus. 8. 



From the Peroneal nerve. 



Extensor cruris brevis. 2. 



Peroneus. 2. 



Tibialis anticus longus. 6. 



Tibialis anticus brevis. 2. 



Cutaneous branches. 



From the Tibial nerve. 



R. cutaneus cruris posterior. 

 From R. superficialis of the Tibial nerve. 



R. cutaneus cruris medialis inferior. 

 From R. profundus of the Tibial nerve. 



R. cutaneus cruris medialis superior. 

 From the Peroneal nerve. 



R. cutaneus cruris lateralis. 

 Articular branches. 



From the Peroneal nerve. 



R. articularis genu et pedis. 



2. Differences between Rana virescens and the standard furnished 

 by Rana esculenta. 



As has already been stated, the method of ramification of 

 the shank branches varies greatly in the different frogs. This 

 being the case, it has been difficult, even after a large number 

 of dissections, to fix a standard for comparison with the standard 

 adopted by Gaupp for Rana esculenta. The conditions most 

 frequently present in the ten dissections already made have 

 been indicated in Figure i. Further dissections may reveal 

 that some of the differences which seem to be constant are only 

 accidentally coincident in these dissections. While this possi- 

 bility of error is annoying in an attempt to make a statement as 

 to lact, yet in the pursuance of an investigation such as the one 

 here undertaken a variation of this character has no importance. 

 Before any study was made of the number of fibers of any nerve 

 branch, that branch was identified as supplying a certain muscle 



