1908.] 



OF THE BATRACHIAN GENUS HEMISUS. 



925 



cavity. The actual fat itself is contained in a very close meshwoi'k 

 of fibres of connective tissue. When this is cut into and pressed 

 the actual fat i-eadily escapes and floats up to the surface of the 

 water in the dissecting-dish. 



The figure to which reference has been made (text-fig. 188) 

 ^hows the saccus iliacus and adjacent structures intact on the right 

 side save for the removal of the skin. The thin membrane covering 

 the saccus iliacus is left intact. The cut edge of the membrane 

 lying further to the right and continuous with this is the inner 

 lateral wall of the femoral lymph-sac. On the left side the 

 wall of the saccus iliacus is not shown, having been removed by 

 tearing it away, and thus exposing the spongy fat-laden interior 



Text-fig. 188. 



Hinder part of body of another individual oi Xenopns lavis. 

 A. Single lymph-lieart seen through delicate membrane which covers iliac fat -body 

 LJi. Two lymph-hearts lying in fat-body and cut open. 



of the lymph-sac in question. This wall does not fit loosely, but 

 is intimately connected with the fat-holding reticulum below, so 

 that it has to be removed in fragments. The border-line between 

 the two sacs is shown by a depression running along the mem- 

 brane ; it is along this line that the boundary between the sacci 

 iliacus and femoralis is fixed. At the inner upper corner of the 

 saccus iliacus, where it abuts upon the middle line of the body, a 

 triangular flap of the covering of the saccus iliacus is cut and 

 reflected. This shows a portion of a muscle which is presumably 



