338 MK. F, E, BEDDARD ON THE ANATOMY [Apr. 9, 



coraco-radialis . The latter is fully exposed in liana owing to the 

 slendei'uess of the slip, which represents in that Frog the very 

 large pars episternalis deltoidei of Megalophrys. 



The Coraco-hrachialis brevis seems to be exactly as in Rana. 

 The coraco-brachialis longus is a double muscle, exposed only by 

 cutting the pars sternalis of the pectoral. 



I could not find the pectoro-cutaneous muscles which are so 

 conspicuous in the large Rana gupj^yi. 



Rectus ahdoviinis. — This muscle arises precisely as in Rana 

 from the pelvis, and has here the same conical form, expanding as 

 it does rapidly from behind forwards. Between the two Recti 

 lies the anterior abdominal vein, which is evident until it dips 

 beneath the backwardly prolonged sternum in front. The rectus 

 abdominis has only four Inscriptiones tendinece. Three of these 

 lie behind the posterior end of the sternum. The fourth lies 

 beneath the expanded xiphisternum, covered by it, that is to say, 

 when the frog is viewed from the ventral aspect. In Rana 

 teriiporaria there are five of these transvei'se septa, between the 

 several sections of the muscle. Anteiiorly to the first inscriptio 

 tendinea the main mass of the muscle passes withovit a break, as 

 in Rana, into the sterno-hyoid. A portion of the rectus muscle, 

 however, just antei^or to the origin of the pectoralis abdominalis 

 and largely covered by the obliquus, is separable by a distinct gap 

 and lies at the outside of the main mass of the rectus. This 

 muscular slip ends in a strong tendon which is attached to the 

 rhomboid swelling of the sternum and seems even to reach the 

 coracoid beyond it. 



The Sterno-hyoideus is rather more complicated than in Rana. 

 It is first of all found as the forward extension of the rectus 

 abdominis. From the expanded xiphisternum — from its anterior 

 edge — a flat band of fibres runs forward which dip under the tendon 

 of the sternal insertion of the rectus and join the main mass of 

 the sterno-hyoid. There is a third origin of this muscle from the 

 concealed (dorsal) surface of the sternum. The fibres of this 

 muscle arise from further back along the sternum almost from 

 the very extremity of the expanded xiphisternum. The more 

 anteriorly arising fibres form a separate muscle, distinguishable 

 even by a lighter colour, which runs along the inside of the main 

 body of the sterno-hyoid. The insertion upon the body of the 

 hyoid is more extensive than in either Rana or Pelodytes. The 

 insertions of the two muscles are in contact in the middle line of 

 the cartilage and they extend further anterioiiy. 



§ Hyoid and its Mtiscidature. 



The Hyoid and its onnsculaticre are in some ways peculiar in 

 Megalojjhrys nasuta as compared with those of other Bati-achia. 

 On opening the body-cavity, a strong pillar of muscle is seen 

 anteriorly resting on the pharynx on either side. This is the 

 ceratohyal with the enveloping hyoglossal muscle. In Rana the 



