FIONA. 



9. Transverse section of a branchial papilla : — a, gland ; b, afferent vessels ; c, efferent vessel, 

 leading from the papilla to the great branchio-cardiac trunk ; d, intercellular space, between 

 the outer wall of the papilla and the sheath of the gland. 



10. Dorsal view of the heart, the pericardium being laid open : — a, ventricle ; b, aorta ; c, auricle ; 



d, great posterior branchio-cardiac vessel laid open, showing its connexion with the auricle, 

 and likewise with the branches from the papillae ; e, portal heart, lying under the floor of 

 the pericardium, and opening through it ; f, /, efferent vessels from the branchial papillae ; g, 

 lateral branchio-cardiac trunk-vein. 



11. Cerebral ganglions : — a,a, cerebroid ganglions ; b, b, branchial ; c, c, pedial ; d, d, olfactory ; e, e, 



buccal;/,/, gastro-cesophageal;^, nervous cord, uniting the buccal ganglions to the cerebroids; 

 h, small collar connecting the branchial ganglions ; i, great oesophageal or pedial collar ; 1, 

 olfactory nerves ; 2, nerves to the upper portion of the channel of the mouth ; 3, 4, those to 

 the sides of the channel of the mouth and the lips ; 5, those to the skin at the sides of the 

 head; 6, 7, pallial or dorsal-skin nerves; 8, 9, pedial nerves; 10, lingual nerves; 11, buccal 

 nerves; 12, oesophageal nerves; 13, hepatic nerves, going to the glands of the papillae ; 14, 

 visceral nerves ; 15, a nerve probably supplying the male intromittent organ. 



