898 



MR. F. E. BEDDARD ON THE 



[Nov. 26, 



with M. montana. In that Frog the epiphysis (which is straighter 

 and not so curled as in M. nasuta) is continuous with the carti- 

 laginous posterior border of the thyrohyal, and is not detachable. 

 In Xenophrys monticolcc there is a slight difierence ; the carti- 

 laginous epiphysis is easily detachable and is attached to the bony 

 shaft, as is shown in the accomjDanying figure (text-fig. 238), partly 

 to the side and partly to the posterior border of the thyrohyal. 

 The thyrohyal of LeptohrachhiTn hasseltii is quite different from 

 any of the types just described. The bone is straight and narrow 

 at the posterior end. It has not the hourglass-shape that it has 



Text-fiff. 238. 



Laryngeal cartilages and adjacent structures of 2lenophri/s monticola. 



Bronchial cartilage, c. Bony shaft of thyrohj-al with cartilaginous epiphj'sis to 

 left. hp. Hypopharyngeal processes of cricoid cartilages, p.h.'i. Posterior 

 petrohyoid. 



in the other genei-a. It ends in cartilage below, and from this 

 latter is readily detachable by a slighter cartilaginous epiphysis. 

 This region of the hyoid in Leptohrachmm (text-fig. 239) difliers 

 much more from that of Xenophrys than the latter genus does in 

 this respect from Megcdophrys. A final peculiarity of the thyro- 

 hyal epiphysis distinguishes Xenophrys from both species of Mega- 

 lophrys. In the two latter the epiphysis is distinctly postei'ior to 

 the petrohyoideus posterior tertius muscle. In Xenophrys^ on 

 the other hand, this cartilaginous process lies as distinctly in 



