924 



MR. F. E. BEDDARD ON TWO SPECIES 



[Dec. 14, 



Here there is no development of a series of secondary longitudinal 

 trunks. The aorta itself is in close apposition to the dorsal 

 middle line. And the intercostal branches arise in regular pairs, 



Text-fig. 284. 



A 



t^ 



^•sS^* 



/.c- 



^ 



Ao. 



Two isolated pieces of the dorsal aorta of Boa madagascariensis. 



A. From the region of the kidnej'. B. From the region of the liver. 



Ao. Aorta, i.e. Intercostal arteries. 



The arteries shown to the right of B are hepatic or gastric arteries. 



one pair to each vertebra, from the aoita itself. The development 

 of secondary longitudinal trunks, which is so common a pheno- 

 menon in veins and arteries among the Ophidia, is, however, seen 



