188 OF THE HEART, VESSELS ^ 



B, '^'hich fupplies the parts of the upper iaw, the eye, the 

 nofe, the ear^ and gives fmali branches to the fore-part of thc 

 brain» , 



17, From the uppermoA ^'ein D, E« of the fecond gill 

 Other fmall arteries F. F. are fent offto the jaws» After that 

 a vein R is added, compoledof the under vein H. of rhe fecond 

 gill and upper one I of the third, A little below the joining 

 of all thefe veins a retrograde artery h, analogous to our ver- 

 tebral, is fent off to the brain, cerebeilum and top of the fpi. 

 nal marrow, the branches of which have larae and nume-^ 

 rous conimunications with each other and with the correfpon- 

 ding artery of the other lide ; and from them chiefly the en«* 

 cephalon is fupplied. Then the trunk M, from which this 

 artery came off, meets at N with its fellow M from tbe other 

 iide; and, about a finger-breadth h)wcr, there is added, 011 

 each fide , a vein R , formed by the under vein P oi the third 

 gill , and iipper vein Q^of the fourth* 



I B» About a quarter of an inch below the meeting of all 

 ihe above at T, is fent offfrom each fide, at nearly right an- 

 gles, a very large artery U, analogous in fame mcafure to our 

 fubclavian. A large branch, a, from the root of that artery, 

 fupplies fome parts of the lower jaw, then running to>y/ards 

 the fore-pf-rt of the gills,it anafiomofes freely wirh the exterior 

 ends of all the branchiai veins (f), after wliich it fends bran- 

 ehes Q^Ci Q^tho te gills themfelves, which feem to me ana- 

 logous ta our branchial arteriesj efpecially as from the fame 

 part the heart receives its coronary arteries (^). The red of 

 the great artery, which 1 have cailed iil^e to our fubclavian, 



fup- 



(i) Tab. I. 5. a et fig. 4. P. R, R, R. (Cinfus fonginnis in hac 

 arteria fubclavia forfare retrogradus eft; fi eniui ab initio truiu 

 ci verHis ramos movetur, dupliccm circulationem nempe mi» 

 r.orem pcr has anaftomofes ct ujajorem pet cor adefle coii» 

 jecluro.) 



ik) Tab. L rig.4<S. S, 



