PLATE XXXIX. 



Class PISCE S continued. 

 THE COD continued. 



FIG. 1. BRANCHIAL CIRCULATION. Some of the gill filaments have been 

 removed in order to show the relation of the afferent vessels to 

 the gill arches, x about |. 



v. a. ventral aorta giving off the afferent branchial vessels : c. cephalic 

 circle receiving the efferent branchial vessels. 



FIG. 2. CIRCULATORY SYSTEM : VIEW FROM THE LEFT SIDE, x . 



s. v. sinus venosus : a. auricle : v. ventricle : v. a. ventral aorta giving 

 off the left afferent vessels : hy. hyoidean artery: p.f. artery 

 to the pelvic fin : ps. pseudobranchia : e. eye : c. c. posterior 

 portion of the cephalic circle : sc. left subclavian artery : 

 cce. cceliac artery : m. mesenteric artery (The third artery is 

 the right subclavian) : a. dorsal aorta : c. a. caudal artery : 

 c. v. caudal vein: p. 1 -, p. 2 posterior cardinal veins: s. swim- 

 bladder: r. rete mirabile : a. 1 , a. 2 anterior cardinal veins : 

 c. Cuvierian duct : i. inferior jugular vein : v. s. vessels to the 

 bladder and the body walls : sp. v., sp. a. spermatic vein and 

 artery : p. portal vein to the liver ; h. hepatic veins. 



FIG. 3. DIAGRAM OF THE CIRCULATION IN A FISH. Altered from M. H. Milne- 

 Edwards. 



a. auricle : v. ventricle ; Z. bulbus arteriosus : v. a. ventral aorta : 

 b. v. branchial vessels : d. a. dorsal aorta : i. intestine : k. 

 kidney : p. portal vein : c. 1 , c. 2 anterior and posterior cardinal 

 veins : s. sinus venosus. 



