906 



MR. F. E. BEDDARD ON THE ANATOMY 



rOec. 15, 



present any suggestion as to the homology of the muscles lacks a 

 firm base upon comparative anatomy — be more reasonable to 

 regard the muscles in question as a part of the submentalis. In; 

 any case, I do not find the least trace of this muscle in Heviisus. 



Text-fie-. 178. 



StJi 



Ventral musculature of neck-region in Hemisus fjnttatmn. 



Submentalis muscle. ff.Ji. Geniohj-oid ; the wliite lines dividing the two lateral 

 parts of the muscles from the median practically unpaired portion represent 

 the hj'poglossal nerve. St.h. Sternohyoid muscles ; the three separate muscles 

 are shown. To the left of these are seen the petrohyoidei. 



Subtnaxillaris. — Although Hemisus diflers from Rhinoderma in 

 the matter just referred to, the two agree in the specialization of 

 the submaxillaris proper (not including the subhyoideus, which 

 was foi'merly regarded as being a part of this muscle) into two 

 regions. The conditions observable in Hemisits are shown in the 

 figure referred to above (text-fig. 176, p. 899). The main mass 

 of the muscle, which is all that exists in Rana and many other 

 Batrachians, is indistinguishable posteriorly from the subhyoideus. 

 Each muscle is divided from its fellow in the middle line of the 



