1905. ] ON THE VASCULAR SYSTEM OF HATTERIA. 461 
7. Some Additions to the Knowledge of the Anatomy, 
principally of the Vascular System, of Hatteria, Croco- 
dilus, and certain Lacertilia. By Frank E. Beppaxrp, 
M.A., F.R.S., Prosector to the Society. 
[Received June 5, 1905. | 
(Text-figures 59-69.) 
(1) On some Points in the Vascular System of Hatteria, 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 Amphisbena brasiliana, particularly of the Vascular 
System and the Mesenteries, p. 479. 
(1) On some Points in the Vascular System of Hatteria. 
it is a noteworthy 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 Sauropsida. 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, there 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, Osawa‘ has lately used the internal 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. Hochstetter =, 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 ||, 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. 
FHatteria in the system. 
* Milano, Zool. Jahrbiicher (Abth. f. Anat.), vii. p. 546. 
+ Arch. f. mikr. Anat. Bd. xlix. p. 113. 
{ Morph. Jahrb. vol. xxvi. p. 217, pl. v. fig. 1. 
§ Ibid. vol. xviii. 
|| Trans. Zool. Soc. vol. xvi. p 1. 
