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



The following papers were read : — 



1. Some Notes on the Muscular and Visceral Anatomy o£ 

 the Batrachian Genus Ilemisus, with Notes on the 

 Lymph-Hearts of this and other Genera. By Frank E. 

 Beddard, M.A., F.R.S., F.Z.S. 



[Received October 23, 1908.] 

 (Text-figures 176-190.) 



The existing knowledge of this genus of Frogs is limited, so far 

 as I am aware, to the external characters *, the osteology, and 

 certain points in the anatomy of the tadpole t. I therefore take the 

 opportunity afforded by the death of the only example of a species 

 of Hemisus {H. gattatttm) ever possessed by the Society to lay 

 before the Meeting a few notes upon the structure of the " soft 

 parts " of the adult, as a further % contribution to the anatomy 

 of the Engystomatidfe. 



As I have had only one individual for examination, my account 

 of the anatomy of Hemisus cannot aim at being comprehensive. 

 I have, however, been able to get together a considerable number 

 of facts upon the anatomy of many organs and systems of organs 

 in this Frog, which I treat of in the following order : — ■ 



Dorsal Musculature, p. 894. 



Yentral Musculature, p. 898. 



Hyoid and its Musculature, p. 907. 



Musculature of the Thigh, p. 912. . 



Abdominal Viscera, p. 913. 



Thymus Gland, p. 915. 



Posterior Lymph- Hearts and Sacs, p. 916. 



Posterior Lymph-Hearts of Xenopus, p. 924. 



Lymph-Hearts of Rana guppyi, p. 930. 



Resume of Characters of Hemisus, p. 932. 



Resume of principal new Facts, p. 933. 



§ Mtcscles of the Doi'sal Surface. 



Contrary to what is found in Breviceps and Rhinoderma, the 

 depressor mandihulce of Hemisus is quite large and well developed. 

 It arises in the ordinary way from the fascia dorsalis over- 

 lying the latissimus dorsi and crosses the scapula on its way to 

 its insertion on to the lower jaw. Of this muscle the outer 

 margin is thicker than the rest, though there is no abrupt break 

 dividing the muscle into two sections. 



* Boulenger's Cat. Batv. Sal. B. M. 1882, and literature therein cited ; Gadovv, 

 in Cambridge Natural History, vol. viii. 1901, relating to Reptiles and Amphibians. 



t Bles, " Notes on Anuran Development, &c.," Budgett Mem. Vol., Cambridge. 



X "On the Anatomy of Breviceps" F.Z.S. 1908, p. 11. "On the Anatomy of 

 EJdnoderma" P. Z. S. 1908, p. 678. 



