OCR Text |
Show 478 MR. F. E. BEDDARD ON THE [Nov. 28, parietes in line with the afferent renal veins that have just been described, and an inner series emerging from the body-wail close to the median dorsal line. Of the latter I observed only one vessel on each side of the body. Of the former there were two on the left side and one on the right. They collected blood, however, from more than one intercostal space. On the left side a blood-vessel belonging to the same series runs from the paiietes to the sperm-duct some way behind the testis and supra-renal. I did not observe one of these vessels on the right side. Resume. It may be useful to state briefly the main facts in the circulatory system of this Lizard for purposes of an easier comparison with other forms. Arterial System. (1) The origin of the carotids from the carotid arch suggests the carotid " gland " of the Frog, inasmuch as the carotid trunk arises by several mouths from the carotid arch as it bends round to join the systemic arch. (2) As in some other Lizards, the pulmonary artery gives off a branch running along the trachea and supplying the thyroid body. This exists only on the right side. The artery is relatively small. (3) The subclavians are two slender vessels arising by a common trunk from the right aorta and give off two vertebrals, one arising from each. (4) The intercostals are quite regularly paired, and nowhere deficient or asymmetrical. They commence upon the right aorta before it joins the left. (5) The left aorta gives off several oesophageal branches. (6) There are seven oesophageal arteries arising from the common aorta, of which the last three arise from the intercostal of the left side. (7) There are five gastric arteries anterior to the coeliac. (8) The liver is supplied with arterial blood from two sources. First by the usual Lacertilian hepatic artery, which is a branch of the coeliac; and secondly by a number of small trunks accompanying the gastro-hepatic vessels and arising from the gastric arteries. (9) The relative positions of the coeliac, superior mesenteric, and cfecal arteries (as has been shown by Rathke and Hochstetter) differ. (10) The renal arteries are six or seven in number, arising in common with the intercostals and nearly regularly paired. The iliac arteries also give oft' a branch to the kidneys. Venous System. (1) The anterior vena cava of the right side receives a branch |