OF FROGS OF THE GENUS MEGALOPHRYS. 403 



observable in other Megalophryidfe. The suhmeutcdis is large 

 and conspicuous anteriorly. In the middle of the area occupied 

 by the two succeeding muscles is a tendinous sheet quite similar 

 to that which I have figured in LejytohraGhium hasseltii*. This is 

 concerned with the subhyoideus as well as with the suhmaxillaris 

 muscle. The fibres of the latter radiate a good deal from the 

 central tendon — that is to say, they do not cross the jaw space 



Text-fig. 129. 



Sk. 



Ventral musculature of tlje tliroat oi Megalophrysfece. 



Sk. Skin reflected. A. Subhyoideus. S. Submaxillaris. 

 Anteriorly to the latter is the submentalis. 



evenly and in parallel lines from side to side, being only interrupted 

 by the central tendon. The line of demarcation between the sub- 

 maxillaris and subhyoideus is very distinct indeed. The sub- 

 maxillaris, it should be remarked, completely covers over the 

 submentalis, though it thins oflf in this anterior region of the 

 throat. 



§ Muscidaiure of the Dorsal Surface. 



The depressor mandihulce seems to be very much as in Rana 

 and is a stout muscle firmly attached in front to the skull, where 

 it shows thicker in transverse section ; it completely covers the 

 scapula together with the latissimus dorsi, the two forming a con- 

 tinuous sheet of muscle. I have not mentioned the depressor 

 mandibulse in my two former papers upon the anatomy of the 

 Pelobatidae, and therefore take this opportunity of asserting its 

 presence in the genus Megalojihrys. 



* "Contributions to the Knowledge of the . . . Pelobatida;," P.^. S. 1907,p. 884, 

 text-fig. 232. 



