OF FROGS OF THE GENUS MEGALOPHRYS. 399 



line the gut. But the general plan is the same. The first region, 

 which is so very short, is marked off horn the stomach by a sudden 

 diminution in the thickness of its walls. The lining-membrane 

 is at fii'st smooth and is later covered by iddges forming a reti- 

 culum. These gradually become the circulnr folds like those of 

 £reviceps ; but the region of the gut where the cix-cular folds occur 

 is very limited and not more than 10 mm. long. The terminal 

 and narrower poi'tion of the gut is marked by about ten longi- 

 tudinal folds, the transition between which and the transvei'se 

 folds is a network. 



These folds are at first permanent and cannot be removed by 

 stretching the gut ; later they exist, but can be removed by 

 stretching. Finally, this region of the gut becomes smooth before 

 its opening into the large intestine. The latter is at first smooth 

 but later has longitudinally running folds. 



The liver viewed from the ventral surface is seen to consist of 

 a larger left lobe and a much smaller right lobe, between which 

 the large gall-bladder is very obvious and extends back a good 

 way beyond the edge of the liver into the abdominal cavity. 

 Under the large left lobe lies a smaller lobe, which is of about the 

 same size as the right lobe and is continuous with it under the 

 pericardium and membrane of the gall-bladder. 



Lying above the viscera the large suhvertehral lymph-space is 

 very obvious. Its relations to the body-wall and to adjacent 

 viscera are as follows : — The sac is bifurcate in form and extends 

 forward beyond the anterior end of the kidney, but not so far as 

 to the anterior end of the ileum. The two bifurcations of the 

 sac lie on either side of the ileum, and the sac therefore does not 

 extend so far forward where it lies upon the iliac musculature as 

 it does right and left of this region. It does not extend ventrally 

 to the kidney, but separates this viscus dorsally from the dorsal 

 body-wall. Posteriorly it overlies the bladder, which is firmly 

 attached to its wall. 



§ (Esophageal Muscle. 



This visceral skeletal muscle is so important and characteristic 

 in Megalophrys and its allies that its consideration demands a 

 section to itself. It is rather thin and does not overlap the 

 kidney, which lies entirely posteriorly to it. It does, however, 

 overlap the anterior part of the ileum. I have figured the muscle 

 in Megalophrys montana * as extending far back, in fact so that 

 it overlaps the sacral vertebra transverse process at its compaia- 

 tively narrow origin from the centrum. This was not the case 

 with Megalop)hrys fea;, where the muscle is therefore less extensive. 

 It is, however, large when compared with that of Frogs of other 

 families. It appears to differ but little m details fiom the 

 muscle of Megalophrys nasuta t. 



* P. Z. S. 1907, p. 886, text-fig. 233, m. 

 t Loc. cit. p. 876, text-fig. 239, b. 



