

C.bc. 



Fig. 16 Transverse section through the suprapericardial body of a 'pup' 21 

 cm. long; alum cochineal. X 75. Ph.d., cranial extremity of the pharyngeal 

 diverticulum; Ph. a., pharyngeal artery; C.c, ceratobranchial cartilage; At., 

 arterioles; V.p., subpericardial venous plexus; The vasa lymphatica are repre- 

 sented in solid black; the venae lymphaticae by parallel diagonal lines. P.c, 

 pericardial cavity. 



Fig. 17 Transverse section through the suprapericardial body of a newborn 

 23.5 cm. long; iron hematoxylin. X 50. Ph.d., pharyngeal downgrowth; Cb.c, 

 cardiobranchial cartilage; Ph. a., pharygeal artery; N., nerve; P.c, pericardial 

 cavity; vasa lymphatica in solid black; venae lymphaticae in parallel diagonal 

 lines. 



400 



