1*.)()7.| OK CVAVVMH ,SI'K(MI'.,S OK HC^I-AMATA. 49 



!i.limoiita,ry Ciuinl nvv. collcrtcsd into tvv(i grou[)S, Iciiiviii^ a tract oF 

 (;()n,si<l(iij\.blo Icngtli IVoin wliicli no arteries to tlu; gut txrise. Tlie 

 anterior group is situated just Ixjliind the union of the two aortic 

 arches, a,n(l consists of no less tlia,n seven small arteries sui)plying 

 the a3Soj)hM-gus and stornac;}). These arise from both sid(;s of tlic 

 aorta a,nd are partly arranged in pairs ; they run to both sidf-s of 

 th(f stomach. There is then a long ga[) until th(! or-igin of th<; 

 intestinal arteries. The general plan of these is like that in 

 most Lacertilia, ; })ut th(!r(! are differences in detail from those of 

 nia,ny genei'a. Whcni the m(;sentery is tin-ned over to the riglit 

 th(! (^a-cal a,rt(!ry which arises iriost anteriorly is s(U'n to run over 

 th(! following duod(!na,l artery, but under th(! thii-d artciry, that 

 wln'ch sup[)li(!S tins spleen, &c. 



Wiili r(!gM,r'(l to the v(!Jious system, t\\('. only notes tha,t I liav(! 

 made rvSvv to tin* hcspatic portal systcsm. 'I'lu} junction of the 

 anterior abdominal and the main portal trunk is very near to the 

 conjoint entra,nce of both into the liver — much nearer than is the 

 case with many Lizards. Jn addition to this, the chief portal 

 trunk, there are two vessels whicjh pour blood direct from the 

 stomach into the liver (text-fig. 14) : one of these, the more 

 posterior in position and the larger, is associated with the left 

 lobe ; the other, a slendcsr twig, enters the liver to tlie right of the 

 last described. The ventral [)a,rietal hepa,ti(!sar-e also two, of which 

 olie is a little to the right of the other in its point of entrance to 

 the liver. Both axe rather far forward on the liver. There is 

 but one dorsal paiieto-hepatic. This, a,s is the case; with otlier 

 Lizards*, is associated with the " Hohlv(;nenfortsatz " of the liver, 

 and runs in the mesentery, binding that lobe of th(; liver to 

 the right parietes. It I'uns a. consideral)le way forwards along 

 the vertebx'al column before becoming lost in tlic thi(;kn(!ss of tlx^ 

 paiietes. 



'i.^he pancreas of Ohanutdeolis (text-fig. 14) is constructed upon 

 the usual Lacertiliaii plan, but differs in various details from tha,t 

 of other Liza,rds. It is a Y-shaped gland and completely solid 

 throughout. There are no thin diffuse bra,nches spread through 

 the mesentery such as ai-e to be found in the case of the pancreas 

 of Zoii/iiTVH (/i(/anteusf. One arm of the Y ends, after dilating 

 slightly, in the; concavity of the somewhat bea,n-shaped spleen ; the 

 other forms a, thicik mass in contact with the commencement of 

 the duodenum. The stem of the Y forms a thin rod of pancreatic; 

 tissue, which closely acc^ompanies the portal vein and \evy nearly 

 touches the liver. This region of the pancreas seems to me to be 

 longer than in some other Lacertilia, though in most there is a, 

 process of the pancreas running in the same direction. IIk; 

 splenic lobe of the pancreas is not extraor'dinarily thin, as it is in 

 Tiliqua scincoides +, but of fair-ly robust dianK^tei'. 



* The iibsciico of this veH.sol is rare, l)ut ITochHtetter, whom I linvo been able to 

 eonlinii, hiis iiHserted its nhtiMwa in Chamadeon vulc/aris. L take this opjiortunity 

 of stiitiiif;- that tliis vein i« also absent in Chamadeon verrucosus. 



f Vide infra, p. 55. J See IJeddard, P. Z. S. 1905, vol. ii. p. 202. 



Proc. Zool. Soc— 1907, No. IV. 4 



