16 



MR. F. E. BEDDARD ON THE 



[Jan. 14, 



portion to the animal a very great thickness where it ai'ises 

 posteriorly by the xisual two fleshy pillai'S, one for each half of the 

 muscle. It is sharply crescentic in outline on each side, a state 

 of aflfairs which appears to have been brought about by the 

 inclusion of the thigh within the body and the consequent and 

 mutual pressure. This is plainly shown in the figure (text- 

 fig. 3) and is to be contrasted with the relative form of the same 

 muscle in Rcma. The rectus abdominis of Breviceps also differs 



Text-fig. 3. 

 S.meyzt. 



77V. 



■—J^st. ant. 

 ' i~^ St. post. 



.M. Cbhct 



Superficial ventral musculature of Sreviceps. 



D. Clavicular head of deltoid. F.ahd. Pectoralis abdomiiialis. F.st.ant. Pectoralis 

 sternalis anterior. F.st.post. Pectoralis sternalis posterior. E.abd. Rectus 

 abdominis. SI: Skin-muscle of thigh. S.m. Submaxillaris and subhj-oideus 

 hardlj' distinguishable for some way after their origin. S.ment. Submentalis. 

 X, x^. Muscles of jaw (not speciallj' studied). 



from that mtiscle in Rana by the fact that there is only one 

 i'jiscriptio [tendinea instead of the four or five of Rana and of 

 many other Frogs. This one tendinous inscription is placed a 

 little way behind the origin of the. abdominal portion of the 

 pectoralis muscle which overlaps it nowhere. It is hidden 

 anterioi-ly by the complete union across the middle line of some 

 of the fibres of the abdominal pectoral 



