926 MR. F. E. BEDDARD ON THE ANATOMY [DeC. 15^ 



to be regarded as the cutaneus iliacus, and which has ah^eady 

 been described in Hemisus and Rana gupjjyi. 



It will be noted that, as in Hemisus, this muscle lies withiji the 

 saccus iliacus, and that it is entirely attached to the wall of that 

 sac at its insertion, and does not reach the skin at all. In 

 Hemisus some of the fibres of the corresponding muscle are thus, 

 intercepted, but the rest reach the skin. In Rana all of the 

 fibres of the muscle reach the skin. It is noteworth}'- that the 

 wall of the saccus iliacus, as is clearly shown in the figure, is 

 distinct from the ov^erlying skin and not fused with it as are the 

 dorsal walls of other lymph-spaces such as the adjoining femoral 

 to the lateral septa, to which reference has already been made. 

 On the left side the attachments of the septa bounding the femoral 

 lymph-sac are shown in their attachments to the skin. On the 

 rio-ht side a circular elevation is visible (text-fig. 188, A, p. 925), 

 lyino- pretty well in the centre of the area occupied by what I here 

 compare to the saccus iliacus. This, when cut open, proved to be 

 the single lymph-heart of that side of the body ; it contained a large 

 orange-coloured clot (presumably of lymph), the darker colour of 

 which, as compared with the surrounding tissues, was obvious before 

 cutting into the lymph-heart. The clot was roughly spherical in 

 outline, slightly flattened from above downwards. Its greatest 

 diameter was 4 mm. Thus the heart itself may be considered to 

 be a little larger. On the opposite side of the body there was no 

 single lymph-heart corresponding to that of the right side. There 

 were most distinctly visible, when the surrounding spongy tissue 

 was carefully cut away, two perfectly detached and sejxirate posterior 

 lymph-hearts. Between them was some of the spongy tissue 

 which fills up the lymph-sac, and thei-e was no open communication 

 between the two hearts, whatever may be the facts with regard 

 to a communication by means of finer tubes. These two lymph- 

 hearts lay one behind the other in a perfectly straight line, 

 paxallel with the longitudinal axis of the body. A careful com- 

 parison of the relative positions of the two lymph-hearts of the 

 left side of the body with the single lymph-heart of the right 

 side of the body, showed very clearly that the latter occupied a 

 place midway between the anterior wall of the anterior and the 

 nosterior wall of the posterior left lymph-hearts. It would thus 

 appear to correspond to the two of them — that is, the single right 

 lymph-heart has been produced from a concrescence of two 

 originally separate lymph-heai'ts, or it has given rise by division 

 to two lymph-hearts on the left side. Of these two lymph-hearts 

 of the left side the anterior was distinctly the larger, which is not 

 very well shown in the figure referred to (text-fig. 188). This 

 larger left lymph-heart, moreover, contained a blood-clot which 

 was not to be seen in the interior of the hinder and smaller lymph- 

 heart of the left side. This suggests, of course, that the systole and 

 diastole of the two consecutive hearts are not synchronous, 

 but that one is in systole, while the other is in diastole. The 

 i-emains of the lateral line which are so prominent in Xenopus as 



