1907.] ANATOMY OF THE PELOBATID^. 895 



the inner border of the posterior horn of the hyoid bone, and is 

 here attached to a fascia which covers the m. hyoglossus from 

 beneath. By the same fascia the muscles of opposite sides are 

 connected in the space between the two posterior cornua." I quote 

 this description in full in order to emphasise the differences which 

 Ranuj shows from all of the Pelobatidas examined b}' myself and 

 described in the present paper. In Xenophrys monticola, when 

 the submaxillaris and subhyoideus are cut and reflected, a thin 

 and broad sheet of muscle is seen to occupy the greater part of 

 the area of the throat. This muscle is indistinguishable into two 

 muscles ; for, while in Rcma guppyi (and esculenta as figured by 



Text-fig. 237. 



Some of the hyoid muscles of Jlegalophrys montana. On the right side the 

 processus anterior of the basal cartilage of the hyoid is seen exposed : the 

 corresponding cartilage on the left side (the right-hand of the drawing) is 

 covered by the genioh3'oid muscle, through which it appears dimly. 



-a. Hyoglossus. h. Sternohyoid, c, d, e. Subdivisions of postarior petrohyoid ; the 

 large anterior petrohyoid is seen in front of c. f. Part of geniohyoid. 

 (/. Omohyoid. 



Ecker) a membranous median interval separates the right and left 

 geniohyoid muscles, allowing the subjacent {i. e., dorsally lying) 

 hyoglossus to be seen through this transparent fascia, the genio- 

 hyoideus in Xenophrys is indistinguishable antei-iorly into two 

 halves, the fascia being represented by muscle. There is then 

 no view of the hyoglossus muscle until the geniohyoid is divided 

 and reflected. Furthermore, when the muscle of each side 

 bifurcates to permit of the passage of the sternohyoideus (as in 

 Manaj, the two inner portions form a continuous sheet of muscle 



