1905.] ON THE VASCULAR SYSTEM OF HATTERIA. 461 



7. Some Additious to the Knowledge of the Anatomy, 

 principally of the Vascular System, of Hatteria, Croco- 

 dilus, and certain Lacertilia. By Feank B. Beddakd, 

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



[Received June 5, 1905.] 



(Text-figures 59-69.) 



(1) On some Points in tlie Vascular S3'stem of Satteria, p. 461. 



(2) Notes on certain Veins in the Crocodile, p. 466. 



(3) Notes on the Vascular System of Ophisaurus, p. 468. 



(4) On the Anatomy of AmpMsbcena hrasiliana, particularlj'' of the Vascular 



System and the Mesenteries, p. 479. 



(1) On some Points in the Vascular System o/"Hatteria. 



It is a notewortliy fact that, apart from the absence of a 

 copulatory organ, hardly anyone has attempted to utilise the 

 disposition of the internal viscera of Hatteria in order to show its 

 primitive, or at any rate isolated, position in the series with regard 

 to other Sanropsida. So far as I am aware, the only internal 

 feature in which Hatteria has been alleged to be primitive is in 

 the equal development of the internal surface of the lungs from 

 end to end, thei'e being no trace in this Sauropsidan of the 

 partly or wholly anangious region at the caudal extremity of 

 the lung found in Lizards *, and, of course, especially in Snakes. 

 On the other hand, Osawaf has lately used the inteinial viscera 

 to emphasise the likeness between Hatteria and the Lacertilia, 

 especially even the Agamid Lacertilia. It is, in fact, agreed on 

 all hands that the viscera of this reptile are not widely different 

 from those of Lizards. The absence of a penis could hardly 

 be alleged to be primitive ; it would rather "seem to be a 

 specialisation. 



The vascular system of this reptile does not appear to me to 

 have been much investigated. Osawa, in his otherwise exhaustive 

 survey of the structure of Hatteria, has nothing to say of the 

 blood-vessels. HochstetterJ^ however, has given some details 

 concerning the intestinal arteries, quoting an earlier paper by 

 Klaatch §. In the long bibliography given by Messrs. Howes 

 and Swinnerton [j, which includes references to papers dealing 

 with " soft parts," as well as with skeleton, I can find no memoir 

 quoted which refers to the vascular system. I am able therefore, 

 as I hope, to add something to our knowledge of this system of 

 organs in Hatteria, and to furnish additional evidence towards 

 the settlement of the much-vexed question of the place of 

 Hatteria in the system. 



* Milano, Zool. Jahrbiicher (Abth. f. Anat.), vii. p. 545, 



t Arch. f. mikr. Anat. Bd. xlix. p. 113. 



X Morph. Jahrb. vol. xxvi. p. 217, pi. v. iig. 1. 



§ Ihid. vol. xviii. 



II Trans. Zool. Soc. vol. xvi. p 1. 



