

Fig. 15 Semidiagrammatic graphic reconstruction of the thyreoid gland 

 related vascular elements of an Acanthias embryo 28 mm. long (No. 38)7 

 from the ventral aspect. A.A.I, first aortic arch; At., atrium, C.C, com 

 cardinal vein; E.J., external jugular; S.T., septum transversum; S.V., sinuS 

 venosus; T., thyreoid gland; T.S., thyreoid sinusoids; V., ventricle; V.A., ven- 

 tral aorta. X 8. 



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