1908." 



OF THE BATRACHIAN GENUS HEMISU?. 



921 



with the abdoiBinal cavity at a point corresponding to that of 

 the ostium in Rana escidenta, and also at its posterior extremity 

 where it dips underneath the sac lodging the posterior lymph- 

 heart. A seeker pushed through each ostium eventually appeara 

 at the same place in the abdominal cavity. In Haslam's edition 

 of Ecker's ' Frog ' it is mentioned that the hinder portion of the 

 posterior lymph-heart lies in the saccus iliacus ; but in Gaupp's- 

 edition it is stated that the lymph-heart lies in a special sac of 

 its own. 



Text-fig. 185. 



Saccus iliacus of Bana g^ippyi opened. 



(-. Cutaneous muscle, gl. Glutseus. O. Ostium, leading into abdomiiinl cavitj-. 

 tr. TrabeculiE connecting walls of the lymph-sac. • 



The latter statement is clearly correct for Rana (jupp'A, where 

 the lymph-heart lies just in front of the pyriformis muscle in a 

 special sac, which is at least not in open communication with 

 the saccus iliacus, and which indeed overlies it. There is thus 

 an obvious difference between HGmisus and Rana in that the 

 posterior lymph-heart of the latter lies in a special sac oi its own, 

 whereas that of Hemisus is contained in the saccus iliacus, as is 

 plainly shown in text-fig. 186 (p. 923), where the posterior boundary 

 of that sac touches the posterior wall of the heart. There is a 

 further difference in that the interior of this lymph-sac is largely 

 divided by trabecula?, in the interstices of which is lodged the 



