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APPENDIX 



6. Cut through girdles and note : heart in pericardium, its parts 

 (Fig. 274). 



Fig. 409. — A semi-diagrammatic view of the contents of the abdominal 

 cavity of a male cod which has been opened on the right-hand side. 



a.b., Air bladder; an., anus; l?., bladder; d., duodenum; £-., genital opening; 

 g.h., gall-bladder ; im., ileum ; kd,, kidney duct ; lr., liver ; tss., oesophagus ; 

 py.c, pyloric cseca ; rm., rectum ; st., stomach ; /., testis ; ur., urinary opening. 



J a. Dissect away muscles, etc., in front of the heart, and trace : 

 ventral aorta and afferent branchial arteries (Fig. 274). 

 b. Cut away the floor of the mouth, and on its roof dissect out 

 the efferent branchial system (Fig. 275)- 



Fig. 410. — The brain and its nerves in a cod. 



c.str., Corpora striata, two large masses or ganglia of grey matter which lie at the 

 base of the cerebrum of vertebrata and are here exposed because the roof of the 



mandibular, maxillary, and ophthalmic branches of the fifth nerve ; Vll.hd' 

 Vll.hm., Vll.m., VII.op., VILp-sf., VH.ial.b., hyoidean, hyomandibular', 

 mandibular, palatobuccal, and ophtnalmic branches of seventh nerve * X.c. 

 cutaneous branch of the vagus nerve, from which the lateral line is innervated! 

 The cutaneous branch of the fifth nerve is not shown. 



