82 



L. A. BORRADAILE. 



The ophthalmic arterij (1, fig. 19) runs straight forward over the roof of the stomach 

 without giving off any branches, and finally divides into two vessels which diverge forwards 

 at an acute angle, to supply the eyes. There is no swelling, or median prolongation 

 beyond the bifurcation. The antennary arteries (2, fig. 19) run forwards and outwards from 

 their origin on each side of the ophthalmic artery. On the inner side each gives rise to 



Fig. 19. Arterial system of Coenobita 

 ch/peattis. A. Arteries of female from 

 above ; B. Left or lower branch of ab- 

 dominal artery of male (enlarged). 1. 

 Ophthalmic. 2. Antennary. 3. Anterior 

 gastric. 4. Posterior gastric. 5. Hepatic. 

 6. Sternal. 7. Ventral thoracic. 8. Ven- 

 tral abdominal. 9. Dorsal abdominal. 10. 

 Bight branch of abdominal. 11. Left 

 branch of abdominal. 12. Ovarian. 13. 

 Spermatic. 14. Branches to liver. 15. 

 Ovary. 16. Hind-gut. 17. Right bile 

 duct. 18. Left bile duct. 19. Heart 

 (represented too large). 



an anterior and a posterior gastric artery, which supply the musculature of the stomach. 

 At about the level of the anterior gastric artery there is given off on the outer side a 

 stout branch, which runs downwards and forwards to the green gland. At a short distance 

 in front of the posterior gastric artery a less important outer branch arises, to be distri- 

 buted to the muscles of the adjoining part of the thorax. In front of the stomach the 

 diminished artery is continued forwards to supply the antennae. Besides the above, there are 

 other smaller and more variable branches. 



The hepatic arteries (5, fig. 19). The position of the liver in the abdomen deprives 

 these arteries of the function which gained them their name in other Decapods. It is 

 perhaps best, however, to retain it, rather than add to an already overladen terminology. The 

 hepatic arteries, then, in Coenobita do not supply the liver, but run downwards and for- 

 wards from the heart to supply the sides of the stomach. The sternal artery (6, fig. 19) 

 on leaving the heart runs directly downwards, passes on one side or other of the intestine, 

 and ends by going through the oval hole in the thoracic ganglion and dividing immediately 

 underneath the latter into two branches, one of which passes directly forwards in the middle 

 line and is known as the ventral thoracic artery, while the other runs directly backwards. 

 This latter is the homologue of the ventral abdominal artery of other Decapoda. It has 

 here very little right to the name, but to avoid confusion, and also because it does actually 



