/in English/ 7 



"The cutaneous veins do not join the Cuvierian duct directly, nor are 

 they united by a transverse vessel in the thoracic region to the posterior 

 cardinal vein, but are divided to renal portals . Thus the cutaneous veins 

 differ from the similar veins of the Thunnidae. Moreover the lower cutaneous 

 vein of this family is not homologous to the lower branch of the cutaneous 

 vein of the Thunnidae. The epaxial and hypaxial veins originate in dif- 

 ferent myotomes and they do not form a loop at the caudal region, nor are 

 they connected by the transverse commissure . In Katsuwonus the epaxial and 

 hypaxial cutaneous veins are nearly equal in size and length,, and though 

 they are not straight they are nearly equally distant from the median line 

 of the bodyo These veins run anteriorly and to a deeper part of the body s 

 passing through the myotome of the fifth vertebra <. The epaxial vein passes 

 below the first rib, while the lower passes over ito These two veins receive 

 blood respectively from the sheets of the vascular plexus on the dorsal and 

 ventral sides of the dark red" portion bT the lateral"Mus'cIe7 "In the other 

 genera, Euthynnus and Auxis, the epaxial cutaneous vein is very thick and 

 runs close and parallel to the lateral median line of the body,, running to 

 the deeper part of the body between the myotomes of the fourth and fifth 

 vertebrae. The chief cutaneous segmental veins are united to the epaxial 

 cutaneous vein, and sheets of vascular plexus surrounding the dark red 

 portion of the lateral muscle are connected with vein. The hypaxial 

 cutaneous vein is remarkably short, slender, and zigzag in its course^ 

 disappearing from the surface of the body just behind the postclavicle 

 and before the myotome of the first vertebrae In Katsuwonidae the hypaxial 

 cutaneous vein always passes before and above the first ribo" 



On the basis of these quotations from the original description^ the 

 subcutaneous vessels may be roughly described as follows,, These vessels 

 are under the skin on the sides of the body, originate near the pectoral 

 girdle, run longitudinally and posteriorly, and consist of either one or 

 two homologous or non-homologous vessels. Ordinarily these vessels reach ' 

 the vicinity of the caudal peduncle, but there are some cases in which 

 they disappear posterior to the pectoral girdle* In many cases these 

 vessels have vascular plexuses which are related to the dark red lateral 

 tissue of the fish, but in some cases these are completely lacking „ The 

 arteries are ordinarily simply branches of the dorsal aorta, but the veins 

 are remarkably rich in variations and their relations with the ^uvierian 

 ducts, the renal portal veins, and the cardinal veins show numerous 

 variations as between species, individuals, and even between the two sides 

 of a single specimen. 



furthermore, according to Kishinouye, in the yellowfin tuna 

 ( Neothunnus macropterus ) of the family Thunnidae one vessel ori- 

 ginating from the subcutaneous artery and one vessel originating 

 from the fourth effarent branchial artery join to form a single 

 vessel, while in the genera Auxis and Euthynnus of the Katsuwonidae 

 an anterior and posterior branch from the dorsal aorta sometimes 

 join to form a single subcutaneous artery. 



