. The elasmobranch fishes. Chondrichthyes. THE ELASMOBRANCII FISHES 167 brandies from the ventral gastric artery. It then extends to the cardiac stomacli wliere it anastomoses with the anterior gastrosplenic artery which sup})lies a more anterior segment of the stomach. The ventral intestinal artery () passes over the distal end of the py- lorus and the ventral lobe of the pancreas, to appear on the ventral side of the valvular intestine. On the intestine it supplies the distal part of the duodenum and furnishes the ventral side of the valvu- lar intestine with numerous paired annular br
. The elasmobranch fishes. Chondrichthyes. THE ELASMOBRANCII FISHES 167 brandies from the ventral gastric artery. It then extends to the cardiac stomacli wliere it anastomoses with the anterior gastrosplenic artery which sup})lies a more anterior segment of the stomach. The ventral intestinal artery () passes over the distal end of the py- lorus and the ventral lobe of the pancreas, to appear on the ventral side of the valvular intestine. On the intestine it supplies the distal part of the duodenum and furnishes the ventral side of the valvu- lar intestine with numerous paired annular branches which run on the attached edge of the spiral valve more or less nearly encir- cling the intestine (see fig. 155). The gastroduodenal artery {gd., fig. 156) in addition to supplying the proximal part of the duodenum sends a short branch to the tip of the pylorus. SUPEEIOE (ANTERIOR) MESENTERIC AND ITS BRANCHES The superior mesenteric artery (, fig. 157) as such is usually absent in Heptanchus moculatus and when present it is never more than a short stem given off from the dorsal aorta a little more than one-half the way back in the body cavity. (In figure 155 the superior mesenteric branches [ and ] have been displaced forward.) It im- mediately divides into: (1) an anterior gas- tro-pancreaticosplenic {, fig. 155) and (2) a posterior intestinal (). The anterior gastro-pancreaticosplenic () sends branches to the dorsal and distal parts of the cardiac stomach, to the dorsal lobes of the pancreas, and to the spleen in and on the angle of the stomach. The posterior intestinal artery runs back over the mesentery to the valvular intestine which it joins at about the middle of its length. Then, as the dorsal intestinal (), the artery continues backward to supply the dorsal poste- rior half of the spiral valve with annular branches. Some of these branches anastomose with similar annular branches from the ventral intestinal artery. Finally
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