BLOOD- VASCULAR SYSTEM OF THE LORICATI lOI 



right portal anastomoses with radical a of the left portal. In 

 Scorf<^nichthys this union sometimes occurs, but with Ophi- 

 odon it has never been observed. However, both OpJiiodon and 

 Scoj-pcEuichthys have a connecting vein that interlinks these 2 

 systems in the region of the spleen. 



{c) Right Portal in Hex agr amnios^ ScorpcBiiichthys and Se- 

 bastodes. — In Hexagrammos^ as with Opkiodon, this vessel 

 (PI. IV, fig. 27 ; R.Por.V.) has its origin from an intestinal, and 

 a gastric vein. The I'ight gastric vein (PI. IV, fig. 27 ; R.- 

 Gas.V.) is essentially the same as in Ophiodon, except that 

 there is no posterior mesenteric vein for it to anastomose with 

 on the apex of the stomach, and it runs on the opposite side of 

 the artery from what it does in the other 3 genera. The vessel 

 designated as intestinal vcin^^-^ (PI. IV, fig. 27 ; Int.V.(ij) is the 

 principal intestinal vein. It arises in the region of the rectum, 

 but soon crosses over to follow along the posterior arm of the 

 ileum from which it receives several branches before receiving 

 the splenic vein^ (fig. 27; Spl.V.), and another good-sized 

 branch which drains the region supplied by intestinal artery (2). 

 Passing cephalad, parallel with, but below the corresponding 

 artery it crosses over intestinal vein(o), the anterior part of the 

 intestine, the coeliac artery, radical a of the left portal, and 

 when the stomach is reached unites with the right gastric vein 

 to form the right portal {^g. 27, R.Por.V.), This vessel im- 

 mediately passes under intestinal artery^,), between the coeliac 

 and right hepatic arteries, along the posterior surface of the 

 gall-bladder, but behind the right hepatic arter3^ Here it re- 

 ceives a few small branches from the bladder and terminates 

 in 2 or 3 small branches in the right lobe of the liver, and also 

 anastomoses with radical a of the left portal. 



In Scorpcenichthys the right for tali^X. IV, fig. 29 ; R.Por.V.) 

 has its source entirely from the right gastric and the splenic 

 veins. All of the intestinal veins empty into the left portal. 

 The right gastric vein (fig. 29, R.Gas.V.) is practically the 

 same as in Ophiodon; arising in the cardiac end of the stomach, 



1 In Hexagrammos the spleen is located much further caudad than is the case 

 with any of the other genera studied. Its position is much nearer the vent than 

 the stomach. 



