912 MR. F, E, BEDDARD ON THE ANATOMY [DeC. 15, 



of the stern vim, may be covered over in Hemisus by the greatly 

 modified coracoids, and thus cut off from its relations with the 

 obliquus. The insertions of the sternohyoid are shown in text- 

 fio-. 179, p. 908. They lie one behind the other to the outside of 

 the hyoglossus. It is clear that in the disposition of this muscle 

 Hemisus is nearer to Breviceps than to Rana. 



The cjeniohyoideus {seQ text-fig. 178) has the two usual insertions 

 posteriorly which exist in other Batrachia Salientia. They are 

 divided from each other for a long way up the muscle (towards 

 the mouth) by the main anteriorly running branch of the hypo- 

 glossal nerve. The lateral insertion on to the body of the hyoid 

 of the geniohyoideus is preceded by a gathering together of the 

 fibres of the muscle into a thick strap-shaped band which curves 

 I'ound the insertion of the sternohyoid (the most anteriorly 

 inserted slip of that muscle) and is inserted below it — out of sight 

 in the ordinary position of dissection from below. The inner 

 portion of the muscle is a very delicate layer of fibres which with 

 its fellow of the opposite side completely covers the hyoglossus 

 and extends to the very end of the hyoid appai'atus. In this the 

 muscle resembles that of Brevicejys, but, as pointed out in my 

 description of the latter genus *, the peculiarity is not important. 

 The omohyoid appears to be completely absent, as in Brevicejjs. 

 I could discover no trace of that muscle in Hemisus. 



§ Musculature of the Thigh. 



When the skin is removed from the inside of the thigh the 

 following muscles are brought into view, which are named in 

 order from the anterior border of the thigh, viz., the vastus 

 internus, adductor longus, sartorius, adductor magnus, rectus 

 internus major, and rectus internus minor. 



There is therefore nothnig particularly striking so far about 

 these muscles, which resemble those of Breviceps and even Rana. 

 It is to be noted, however, that the adductor longus is hardly at 

 all exposed and is almost completely covered by the sartorius. 

 In this feature Hemisus differs from Breviceps t and is nearer to 

 Rhinoderma % and Rana. 



In describing the anatomy of Breviceps § I have directed special 

 attention to the partial origin of the rectus internus minor from 

 the skin. The same characteristic feature occurring also in 

 Rhinoderma is a bond of union between these two, in some other 

 respects, not very closely allied genera. This peculiar attachment 

 of the muscle in question to the inner surface of the skin of 

 the leg is also noticeable in Hemisus, but not nearly to so 

 marked an extent as in Breviceps. The insertion upon, or 

 origin from, the skin of the thigh of a few fibres of the muscle 

 was, however, plain enough. 



The semitendAnosus is formed by the union of two fleshy heads. 



* P. Z. S. 1908, p. 14. t P. Z. S. 1908, p. 25, text-fi?. 6. 



X p. Z. S. 1908, p. 691. § P. Z. S. 1908, p. 26. 



