1906.] THE VASCULAR AND RESPIRATORY SYSTEMS IN OPHIDIA. 499 



4. Contributions to the KnowJedo-e o£ the Vascular and 

 Respiratory Systems in the Ophidia^ and to the Anatomy 

 of the Genera Boa and Corallus. By Feank E. 

 Beddard, M.A., F.R.S., Prosector to the Society. 



[Received March 7, 1906.] 



(Text-figures 86-93.) 



The facts of structure which I lay before the Society, in 

 continuation of other memoirs* dealing with the Ophidia, 

 may be conveniently considered under the following headings, 

 viz, : — 



(1) On certain Arteries and Veins in the Genera Erythrolamprus 



and Coluber, p. 499. 



(2) Some Notes upon the Anatomy of Boa diviniloqita and 



B. constrictor, p. 507. 



(3) Notes upon the Boine genus Corallus, p. 516. 



(4) On the Modifications of Structure in the Lungs of certain 



Ophidia, p. 519. 



(1) Oil certain Arteries and Veins in the Genera Erythrolamprus 

 and Coluber, 



Inasmuch as the arrangement of the arteries and veins is 

 known in so few genera of Ophidia, it is clearly useful to 

 collect the facts, even if they appear to have for the time being 

 no bearing upon the classification and relations of the group, 

 I therefore direct attention in the following pages to a few new 

 facts concerning the vascular system of Erythrolamprus cescidapii 

 and Coluber corais, especially of the former species, which was 

 very successfully injected in both the arterial and venous systems. 

 I may observe that with the exception of Tropidonotus natrix, 

 investigated by many anatomists, and most recently by Hoch- 

 stettert, no Colubrine snake has received so much attention as 

 I give to Erythrolamprus in the following account of some of 

 the principal features in the arrangement of its arteries and 

 veins. 



Intercostal Arteries. — The arrangement of these arteries in 

 Erythrolamprus (see text-fig. 86, p. 501) recalls in some particulars 

 the intercostal arteries of Python, and in others the intercostal 

 arteries of Oolubiine Snakes generally +, The anterior region 

 of the aorta down to about the middle of the liver, or rather 

 beyond that point, gives ofi" very numerous intercostals which 



* " Contributions to our Knowledge of the Circulatory System in the Ophidia," 

 P. Z. S. 1904, vol. i. " On the Trachea, Lungs, &c., of the Hamadryad," P. Z. S. 

 1903, vol. ii. " Notes upon the Anatomy of certain Snakes of the Family Boidaj," 

 P. Z. S. 1904, vol. ii. " Visceral Anatomy of Hydrus and Flatyiiriis," ibid. /' Con- 

 tributions to the Anatomy of Ophidia," P. Z. S. 1906, vol. i. 



t Morph. Jahrb. xix. 1893. 



X P. Z. S. 1904, vol. i. p. 335, fig. 67. 



