FIG. 77. 



"* RV Ara AF.a AF 



Fig. 77. — Diagrammatic figure of the head and anterior part of the body of 

 a 7 mm. Tadpole, shortly after hatching ; showing the branchial blood- 

 vessels from the ventral surface. The heart has been removed, x 35. 

 Fig. 78. — Diagrammatic figure of the same embryo from the right side. The 

 heart is represented in situ, but the external gills of the first and second 

 branchial arches have been cut off short at their bases, x 35. 



A, dorsal aorta. AB, basilar artery. AC carotid artery.' AP.l, AF.2, AF.3, 

 fifEerent branchial vessels of first, second, and tliird branchial arches. AP, pulmonary 

 artery. AR, anterior cerebral artery. AT, anterior palatine artery. CA. anteririr 

 commissural vessel. OP, posterior commissural vessel; EF.l, SF.2, EF.3, XiF.4, 

 efferent branchial vessels of first, second, tliird, and fourth branchial arches. EH, 

 efferent vessel of hyoid'aroh. EM, efferent vessel of mandibular arch. G-E, external 

 ffills. G-M, glomerulus. KA, segmental duct. KP, head kidney or pronephros. 

 KS.l, ES.3, first and' third nephrostiomes of head kldneyl 11^.4, efferent lacunar 

 vessel of fourth branchial arch. RA, auricle. RV, ventricle. BT, truncus arteriosus! 

 VD, Cuvierian vein. VH, hepatic veins. VK, vein of sucker. VM, mandibular 

 vein. Vy, hyoidean vein. 



