692 MR. F. E. BEDDARD ON THE [June 16,. 



difference between Eana and Rhinoderma, which is at the same 

 time a point of agreement between Rhinoderma and Breviceps. 

 The rectus internus minor ai'ises in Rhinoderma by a number of 

 more or less separate origins fi'om the skin of the thigh, which 

 origins are very far from reaching the middle line of the abdomen.. 

 The muscular strands which combine to form this muscle are 

 spread out upon the skin, when the latter is cut through and 

 reflected, in a divergent fashion. There are four or five of these 

 strands, which are naturally flat bands. In Breviceps such an 

 extra-skeletal origin of skeletal muscles in the femoral region is 

 more largely developed than in Rhinoderma ; but, as will be seen 

 by a reference to my paper already quoted, the rectus internus is 

 similarly involved in this system of skin muscles. 



Viewing the thigh muscles from the dorsal aspect (see text- 

 fig. 149) and their origins (in some cases) from the back, one 



Text-fig. 149. 



Thigh-muscles of SJiinoderma darwini exposed from the outside. 



Obl.int. Fan-shaped portion of obliquus internus attached to ilium. By. 

 Pyriformis. B.a. Rectus anticus. v.i.m. Rectus internus minor. 

 VJ. Vastus internus, lying to the outside of the vastus externiis. 



obvious and striking difference from Breviceps is to be seen. The 

 coccyx runs very nearly to the extremity of the body ; there is- 

 not the lengthy exposure of the cloaca with certain muscles 

 attached thereto and accompanying it that I have figured in 

 Brevice2ys* . To the tip of the coccyx is attached the 2}prif or ojiis, 

 which in the usual Avay reaches the femur by passing between the 

 vasUos externus and the semimembranosus. The disproportion 



* P.Z. S. 1908, p. 35, text-fig. 11. 



