462 



portant a part as the bucco-pharyngeal area in the aeration of the 

 blood. 



During the past few years I have been investigating the possible 

 respiratory areas of another lungless Salamander, Desmognathus 

 fusca. Owing to its small size (the average length is nine or ten 

 centimeters), I found great difficulty in injecting the circulatory system, 

 and in dissecting out the blood vessels even after a successful injection. 

 It was only after repeated failures that satisfactory preparations were 

 secured. A warm carmine gelatine mass was introduced by means 

 of a hypodermic syringe through the ventricle of the heart. 



mid-ventral line 



mid-dorsal line 



Branch of A. max. 

 externa, left side 



A. pharyngea, left side 



■ ■ T\ V\i A * i V' I'M ' /J^' Pharynx, 



'A \i]\ • \ • ; V ' . ; '■ I r /;'l posterior portion 



Oesophagus 



V. oesophageae ij.-a.iAi.ILL^.'; . 



/ 



V. gastricae 



\\ 

 Dorsal aorta 



Branch which ana- • A^t : 



stomoses anti-riorly 



with A. pulraonalis 



of left side 



A. gastricae 



V. gastrica 



Branch which ana- 

 stomoses anteriorly 

 with A. pulmonalis 

 of right side 



Stomach 



mid-dorsal line mid-ventral line 



Fig. 1, Oesophagus with adjoiiiiug parts of pharynx and stomach. This section 

 of the alimentary canal has been cut open by a longitudinal incision on left side and 

 the wall spread out. Blood vessels injected with carmine gelatine mass, cleared in oil 

 of doves. X ^/j. Camera lucida. 



