1908.] BATRACHIAN RHINODERMA DAUWI^TI. 691 



§ Muscles of the Thigh. 



When the skin is removed and the muscles of the thigh inspected 

 from the inner aspect (text-fig. 148), some diflference is visible 

 from the appearances observable in Rana under similar conditions. 

 For figures of Rana I may refer to Ecker's ' Anatomy of the 

 Frog,' and to a figure of the muscles of the inside of the thigh in 

 the large Rana givppyi*, illustrating a paper by myself on the 

 structure of the Pelobatidse. I have also figured the correspond- 

 ing muscles of Breviceps t, an African genvis belonging to the same 

 family (Engystomatidae) as that which contains the subject of 

 the present communication to the Society. Although there are 



Text-fiff. 148. 



Thigh-muscles of Rliinodet'ma dariuini exposed from the inside. 



JB. Rectus abdominis, v.i.m. Rectus interims minor, where it is attached to 

 the skin. V.i. Vastus internus. Sa. Sartorius. 



differences in detail between the thigh muscles of Rhinoderma 

 and those of Rana, the general aspect of the muscles — with one im- 

 portant exception, to be mentioned presently — is much like that of 

 ^a?ia,and is even definitelymore like Rana esculeniath^nR.gtippyi. 

 It is easy to recognise the vastus internus, adductor longus, sartoriics, 

 adductor magiius, adductor hrevis, rectus internus imajor and rectus 

 internus minor, lying in the order named (and commencing of 

 course at the anterior border of the thigh) and having roughly 

 much the same proportions as the corresponding muscles of Rana 

 escidenta. Moreover, it will be noticed that the smallest adductor 

 muscle lies after the adductor magnus as in Rana esculenta, and 

 not in front of it as in Rana gup>pyi. There is, however, visible, 

 as is well shown in the above figure (text- fig. 148), an important 



* P. Z. S. 1907, p. 887, text-fig. 234. f P- Z- S. 1908, p. 25, text-fig. 6. 



