1908.] OF THE BATRACHIAN GENUS HEMISUS. 915 



duodenum. Thus the pyloric region almost projects ixi a valve- 

 like fashion into the duodenum. The small intestine measures 

 when stretched out 55 mm. Throughout its whole course the 

 small intestine is occupied by rather closely set valvulse conni- 

 ventes, and nowhere can I detect any distinct reticulate arrange- 

 ment of the folds such as I have figured in Rhinoclerma. Here 

 and there faint indications of such are present, but nothing that 

 can be seriously compared to the reticulations found in Rhino- 

 derma or at the commencement of the duodenum as figured in 

 Rana esculenta. The colorectum (text-fig. 181, c), into which 

 the ileum opens, suddenly projecting indeed into its interior, is 

 marked by longitudinally running folds. There is a remarkable 

 resemblance to the stomach in that on one side of the gut the folds 

 are simple, while on the other side there are transverse folds 

 connecting them, and thus a network is formed. 



The kidneys are of considerable length ; the right kidney 

 measures 19 mm., which may be compared with the total body- 

 length of 60 mm. 



The oviducts are thick and very much coiled. The straight 

 piece which intervenes between the funnel and the coiled region 

 is very short. The oviducal funnel lies behind the root of the 

 lung. It is unusually long, and that of the right side at any rate 

 measured 7 mm. It is an open groove and is attached all along 

 to the cervical aponeurosis, the layer of the obliquus internus 

 which closes the abdominal cavity anteriorly. 



The lungs hang quite freely into the abdominal cavity ; they 

 are only attached to the liver quite at the root as in Rana gui^pyi *. 



The diaj)hragm or vesophageal muscle is not an extensive muscle 

 in Hemisus. In this it agrees with its allies. It appeared to me 

 also that, as in Jh-eviceps t, the muscle is entirely inserted upon 

 the oesophagus. 



§ The Thi/mtis Glands. 



In describing the anatomy of Breviceps I have pointed out the 

 large size, compared to those of Rana, of the thymus glands. 

 In the Batrachian with which I deal in the present communi- 

 cation, a pair of bodies v/hich I take to be the thymus glands 

 are much larger still, proportionately as well as actually. In 

 Rana escidenta they are described and figured as being about 

 3 mm. in length. In the specimen of Hemisus upon the dissection 

 of which the present paper is based, and which measured 60 mm. 

 (2^ inches about), each thymus consisted of two discrete portions ; 

 the larger on each side was quite 7 mm. across at its greatest 

 diameter. The position and size of the organs are shown in 

 text-figure 176, /., p. 899. They lie on each side behind 

 the subhyoideus muscle and in front of the sterno-radialis and 

 upon the deltoid, to which especially they are attached by flat 

 bands of connective tissue. Each gland is flat and plate-shaped, 

 of rounded contour; from the middle of the ventral surface a 



* P. Z..S. 1907, p. 349, text-fi^^ 99, m. t P- Z. S. 1903, p. 27. 



