836 MB. r. E. BEDDAH.D oy THE [Dec. 3, 



pendently of and anterior to ^ tLe insertion of the lateral half of the 

 muscle. The posterior half of the muscle is the larger ; it ends in 

 a flat, widish tendon, which is joined behind by the tendon of the 

 latissimns dorsi. Neither part of the muscle has any relation to 

 the deltoid, such as is the case wdth Sana gu]ypyi ; in that frog 

 the tendon becomes adherent to the tendinous sheath of the 

 deltoid before its own insertion. 



There is a small submentalis. 



The suhmaxillaris (myloJiyoid) is divided into two portions, as it 

 is in the Common Frog. The anterior, much the larger, portion 

 runs across the floor of the mouth in the usual way, while the 

 small posterior portion arises from the hyoid. The main part of 

 the muscle arises by six separate digitations from the mandibular 

 margin, as described by Mayer, who gave it on this account the 

 title of " tnusculus hexagastricus." 



Pectoro-mandibulce. Beneath the last-mentioned muscle is a 

 sheet of muscular fibres which is totally unrepresented in the 

 Common Trog and which has a very pecuhar distribution. The 

 muscle appears to correspond to Mayer's ^^ pectonilis superior" 

 but is not fully described or figured by him. The muscle is 

 inserted along the entire length of the mandibles. It arises from 

 the fascia covering over the sternal region of the pectoral muscles, 

 and completely covers those muscles itself. At one corner it is 

 inserted on to the humerus in common with the pectorals. They 

 may possibly correspond to the cutcmeus pectoris of the frog and 

 to the panniculus carnosiis of mammals. 



The sternoradialis is very much larger in proportion in Pipa 

 than it is in Rana. It is at least four times as large as either of 

 the sternal portions of the pectoral, and is indistinctly divisible 

 into three masses. Its tendon, passing to forearm, does not run 

 between the divisions of pectoralis as in Rana. 



The pectoralis consists of three parts, or, if we include the 

 jpfciovo-?nawcZi6M?ar described above, four separate portions. (1) The 

 abdominal portion is of considerable extent, and the two muscles 

 are separated anteriorly by a fascia continuous with them, which 

 pnds anteriorly in a free edge lying on the sternum. Posteriorly 

 the fibres originate from a rhomboidal plate of tendon figured by 

 Mayer, which lies medianly and posteriorly from tendinous 

 intersection ^dth rectus abdominis. (2) The antei-ior sternal 

 portion is superficial to the sternoradialis; it arises by a thin 

 flat tendon from the middle line of the sternum. (3) The 

 posterior sternal portion is in contact with the sternoradialis for its 

 whole length. 



The coraco-humeralis is well developed. 



The deltoid of Ratia guppyi does not correspond with Ecker's 

 description of that muscle in Rana esculenta. The scapular and 

 clavicular heads are the same, but there is, in addition, a third 

 head which ought perhaps to be regarded as a distinct muscle. 



' i. e. nearest to the band. 



