402 MR. F. E. BEDDARD ON THE ANATOMY 



The pect07xdis abdominalis is not veiy extensive ; it reaches 

 back for about one-third of the distance between the end of the 

 sternum and the symphysis pubis. 



The musculature in the sternal region (see text-fig. 125, p. 394) 

 does not entirely cover the bones and cartilages of the shoulder- 

 girdle. The right epicoracoidal cartilage, which greatly overlaps 

 ventrally the corresponding cartilage of the left side, is for 

 the greater part bare of muscle. A large portion of the right 

 coracoid bone and the triangular bony base of the sternum 

 were also uncovered by muscle. In a second specimen, however, 

 the pectoralis did extend over the triangular basal region of the 

 sternum. 



The i^ectus abdominis continues forward anteriorly after the 

 origin of the pectoralis abdominalis and lies to the side of the 

 sternum, sepai-ated from it, however, by a much narrower muscle 

 which arises from the shaft of the sternum, and which I shall 

 again refer to as a portion of the sternohyoideiis. At the 

 anterior end of the dagger-shaped sternum a portion of the 

 rectus abdominis is inserted upon the lateral transverse extension 

 of the " handle " of the " dagger." The rest passes onwards 

 anteriorly and becomes a part of the sternohyoideus. I did not 

 observe in the present species a tendinous connection of the rectus 

 with the edge of the coracoid such as that figured in Xeno- 

 2?hrys monticola *. ISTor did I note any fibrous lateral expansion 

 of the sternum, such as occurs in the species just mentioned, 

 covering over the innermost section of the sternohyoideus muscle. 

 If such a membrane were present it must have been excessively 

 thin and delicate to have escaped observation, 



I have mentioned that in Xenophrys no supei'ficial sternoradialis 

 is visible; in the present species it is only superficial — and then 

 covered by fascia — for a very short distance after its origin from 

 the omosternum. It is thereafter covered by the pectoralis. The 

 strong tendon was followed to its insertion, and there is thus no 

 doubt about the presence of this important muscle in Megalophrys 

 fece. As the fascia in question is continuous with the pectoralis, 

 the sternoradialis may be said to be completely covered by that 

 muscle. The two (anterior and posterior) portions of th.e p>ectoralis 

 sternalis are very distinct at their origin, on the right side at any 

 rate, by reason of the exposed bony end of the coracoid which 

 separates them. The origin of the pectoralis sternalis posterior 

 extends about halfway down the bony shaft of the sternum, but 

 appears to vary in individuals, in the extent of its attachment to 

 the sternum, as the text-figure (text- fig. 125) referred to above 

 shows. 



The throat musculature of Megalophrys fece is exhibited in the 

 accompanying drawing (text-fig. 129). There are no prominent 

 difierences from the conditions of the corresponding muscles 



* P.Z.S. 1907, p. 893, text-fig. 236, a. 



