BY DENE B. FRY. 783 



The most important features of the pectoral myolog)^ of the 

 three frogs may be briefly referred to as follows : — 

 Aphantophryne pansa Fry. 



(1). The pectorales abdominis are very large, and, meeting in 

 the middle line a short distance behind the pectoral girdle, they 

 obscure nearly all the other ventral muscles from view. They 

 originate at the posterior extremit}' of the body. 



(2). 'I'he obliquus externus is separated on the median, ventral 

 line, and is on a more superficial plane than the rectus abdominis. 

 A band of medially-placed fibres, which run parallel to the longi- 

 tudinal axis of the body, may or may not be part of this muscle. 



(3). The pectoralis sternalis is much reduced, and the division 

 into pars epicoracoidalis and pars sternalis is obscure. 



(4). A coraco-radialis, like that in Eana esculenta, is absent. 



(5). A pectoralis cutaneus is absent. 



(6). A coracohumeralis (coraco-brachialis longns 1) seems to be 

 present, although some doubt exists as to whether this muscle is 

 correctly identified (see text). 



(7). A coraco-brachudis brevis iiiternus is not present as a 

 separate muscle. 



(8). 'I'he deltoid is weak and strap-like. There is no fars epi- 

 sternalis, and the pars scapularis is rendered rather prominent 

 by the reduction in size of the pectoralis. 



(9). The rectus abdominis is hidden from view by the large 

 pectorales abdominis. On dissection, it is seen to be in two 

 separate bands, which are widely separated in the middle line 

 anteriorly. There is no linea alba, and only one('?) poststernal 

 inscriptio tendinea. 



Kaloula pulchra Gray. 

 (1.) The pectoralis abdominis is divided into two portions. 

 The portio internus is fan-shaped, and arises from the first post- 

 sternal segment of the rectus; its anterior fibres are in contact 

 with those of the other side, and attach to the sternal plate. 

 The portio externus is quite distinct from the inner portion, and 

 is triangular in shape; its inner edge overlaps the outer edge of 

 the latter. There ai-e numerous fibrous connections with the 

 integument. 



