846 MB. F. E. BEDDAED ON THE [DeC. 3, 



portion extending as far back as the margin oE the thigh; this 

 has been ah-eady described by Maurer ' and its resemblances to a 

 similar muscle in Pipa commented upon by myself ■. I need not 

 therefore again refer to the matter. 



The Cucullaris is a distinctly oblong muscle when seen before 

 raising the supra-scapula. Its fibres, however, converge beneath 

 the scapula into a long flat tendon, which is inserted into the 

 scapular edge near to its posterior boundary, and where it is also 

 widest. The left supra-scapula here deeply overlaps the right ; 

 the muscle, therefore, of the left side is dorsal to the right supra- 

 scapula. 



The Mhomboideus is a small delicate muscle arising by an oblique 

 origin, which touches the middle line of the back anteriorly and 

 diverges posteriorly ; in its course it crosses the cucullaris on the 

 outer side (i. e. that nearest the arm), and is inserted on to the 

 supra-scapula anteriorly. The muscles are of course completely 

 covered by the supra-scapula. 



The infra-s]pinatus is entirely covered by the lati^simus clorsi ; 

 and when this is removed its posterior half is seen to be concealed 

 by the transversus. It is not a double muscle as in Pipa ; but 

 its line of origin is shaped like the figure 3, being indented 

 in the middle ; it does not anywhere reach the border of the 

 supra-scapula. It is inserted in common with the latissimus 

 dorsi. 



The Mylohyoid appears to be entirely similar to the same muscle 

 in the Common Frog. 



The Pectoralis consists of the three usual divisions. The portio 

 sternalis anterior is much larger than the posterior ; the origin of 

 these two divisions of the pectoralis is from the entire length of 

 the sternum ; they completely cover all underlying muscles. There 

 is no musculus cutaneus pectoris. 



Of the two muscles which are brought into view by cutting 

 across and reflecting the sternal portion of the pectoralis, the 

 Sterno-radialis is much the larger ; it takes origin from, at least, 

 two-thirds of the sternum, as well as from the epicoracoid ; its 

 fibres converge rapidly to form a narrow flat tendon. 



The Coraco-humeralis is a large muscle ; it arises along the 

 whole of the coracoid and also from the end of the sternum. 



The Triceps femoris consists of the usual three divisions. The 

 Rectus amicus arises from a very narrow tendon, but rapidly 

 swells out into a big muscle which ends in the fascia covering 

 the vastus internus. In Itana guppyi the connection of this muscle 

 is first with the vastus externus. 



The Semimembranosus is a particularly stout muscle ; but it 

 presents no noteworthy particular. Neither does the Biceps 

 femoris. 



The Adducter longus is covered by the sartonus ; it arises by a 



1 " Die ventrale Rumpfmuskulafcur der anuren Ampliibien," Morph. Jahrb., 

 1895. 



^ " On some Points in the Anatomy of Pipa americana," above, p. 827. 



