14 MR. F. E. BEDDARD OX THE [May 3, 



springs from the ventral surface of the aorta, just in front of a 

 pair of intercostals ; it crosses one of these intercostals, but blends 

 with that artery at the point of crossing. The next visceral 

 artery to arise from the aorta is the oviducal of each side ; these 

 are strictly symm.etrical, and each arises, not independently from 

 the aorta, but from the intercostal of its own side. Next arises 

 the csecocolic artery, which is crossed shortly after its origin in 

 the usual way * by the subsequently arising coehac trunk, which 

 is, it wOl be observed, a single trunk. Upon this trunk follows 

 the ovarian and suprarenals, of which one arises independently 

 from the aorta and the other from the intercostal of its own 

 side. Then occurs a long gap, the next trunk to arise being the 

 right renal, which springs from an intercostal. So, too, and a 

 little further back, does another oviducal artery. 



On the whole, therefore, the most remarkable feature of the 

 arterial system of Pygojms appears to be the origin of many of 

 the arterial branches from the intercostals instead of directly 

 from the aorta. Noteworthy, too, is the large number of gastric 

 arteries, which is perhaps to be looked upon as associated with the 

 snake-like form of this lizard. 



There being only rudimentary hind limbs, the system of the vence 

 rencdes adveJientes is much simplified (Text-fig. 4, p. 1 5). The caudal 

 vein divides into two branches, one for each kidney. Each vein 

 soon divides into three branches, i. e. the anterior abdominal, 

 the lateral abdominal, and the afferent renal. This last vein, 

 in the case of the right kidney, runs over the gland, giving off 

 branches, nearly to its anterior extremity. On the left side the 

 termination of this vein was particularly interesting, as showing 

 a distinct resemblance to the Chamfeleon. As in the latter 

 reptile, the vein does not end upon the kidney, but is prolonged 

 beyond it for some little distance, and is lost in the parietes to the 

 left of the middle line. It clearly represents the posterior vertebral 

 vein, and its presence on one side of the body only is, it will be 

 remembered, occasionally paralleled in Ghamiceleon. At about the 

 middle of the kidney a vein from the oviduct (on each side) 

 reaches the afferent renal. 



The efferent renals arise at first as a single trunk very near to 

 the posterior end of the kidneys, and of course between them. 

 This trunk divides into two before reaching the middle of the 

 kidneys. The left efferent renal receives first of all a vein from 

 the posterior region of the left ovary, and then passes in close 

 contact to, receiving branches from, the left suprarenal. It forms 

 the right efferent renal just in front of the left and just behind 

 the right suprarenal. Before their junction the right efferent 

 renal receives a branch from the posterior region of the right 

 ovary. Into the vena cava thus formed by the union of the two 

 efferent renals opens first of all, and at abotit the middle of the 

 right suprarenal, the anterior left ovarian vein, into which opens 



* See Hoclistetter's account of visceral arteries in Lacertilia in Morph. Jahrb. 

 vol. xsvi. p. 213. 



