1907.] ANATOMY OF THE PEL0BATIDJ3. 873 



be contrasted in the two species. In Megalophrys montana they 

 are much more numerous than in the other species. On the head, 

 however, I only found two, and this is not very different from 

 the three tubei'cles found on the head of M. nasu.ta. On the 

 back and sides there are a considerable number in Megalophrys 

 montana. They are perhaps rather less couspicuoiis than tliose of 

 M. nasuta ; but this is partly a matter of the smaller size of 

 M. montana. Furthermore they present the appearance of sessile 

 barnacles, owing to their variegated colour and radiall}^ arranged 

 grooves ; this, however, is possibly merely a matter of shrinkage 

 of the skin. 



§ Abdominal Viscera. 



The liver of this species is on the whole like that of M. nasuta. 

 The right lobe is much the smaller, and the left lobe consists of 

 two halves, of which the larger completely covers the more dorsally 

 placed and smaller portion. In Megalophrys montana, there is no 

 distinct ring-like thickening, marking off the pyloric end of 

 the stomach from the duodenum, such as occurs in M. nasuta and 

 is there veiy pronounced. The alimentary viscera, however, do 

 not vary greatly among the Pelobatida?. 



Certain features in the muscular anatomy of this Frog as com- 

 pared with its alleged congener are dealt with in the ensuing- 

 section of tlie present paper, where they are more conveniently 

 treated of. Broadly speaking, Megalophrys montana agrees with 

 M. nasuta in those peculiarities of myology which I have already 

 pointed out as differentiating Megalophrys from liana *. 



§ Lungs. 



The lungs of this species are interesting from more than one 

 point of view. In describing those organs in Megalophrys nasuta 

 I pointed out that this Frog differs from Rana by the fact that 

 the right lung is attached to the liver and the membrane bearing 

 the bile-ducts &c., by a ligament which extends much furtlier 

 down the lung than it does in Rana. A portion of the lung, 

 however, towards the free tip is not attached by a part of tlris 

 ligament, which ceases at some little distance from the tip. 

 Megalophrys montana shows a condition of the pulmonary ligament 

 which is an exaggeration of the conditions found in M. nasuta. 

 The pulmonary ligament in fact extends to the very end of the 

 lung. Moreover, as in M. nasuta, there are two ligaments, of 

 which one is attached as mentioned while the other is fixed to 

 the dorsal body-wall. At their insertion on to the lung these 

 two ligan^ients are continuous at one point. It follows, therefore, 

 that a part at least of the lung is hidden away in a chamber of 

 the coelom which is cut off from the general coelom of the abdo- 

 minal cavity. This is obviously a step in the direction of the 



* P. Z. S. 1907, p. 3-48. 



