36 



MR. F. E. BEDDARD ON THE 



[Jan. 14, 



of the lymph into the heart from the Ipnph-sac already referred 

 to which lies behind it. When a lymph-heart is cut open the 

 structure presented is that which is represented in the lower 

 figure, text-fig. 12, There is the same division into two regions, 

 the walls of the anterior part being smooth and thick. In the 

 posterior part the longitudinally-running bands of miiscle stand 

 out from the walls, projecting into the interior of the sac, as is 

 shown in the figure. 



Text-fis'. 12. 



Upper figure, lymph-heart of JBreviceps isolated ; lower figure, view ot 

 interior of same. 



The attachment of each lymph-heart to the integument by 

 strands of muscles would doubtless increase the efficiency of that 

 organ as a pump by providing a fixed point for the contraction of 

 its muscles to pull against. There is, however, another series of 

 muscles attached to the opposite side of each heait, and acting 

 in a direction parallel to and in the same plane as, but obviously 



