420 SURGEON J. C. THOMPSON ON THE 



The external landmarks of the principal viscera in terms of 

 gastrosteges are as follows : — ■ 



Total number of gastrosteges ... 174 100 p. cent. 



Apex of heart 37 21 "3 



Liver, anterior tip 44 25*3 



„ posterior end 96 55'1 



Gall-bladder 114 65-3 



Kidney, right, anterior tip 142 81-8 



„ „ posterior end ... 149 85-8 



,, left, anterior tip 144 82-8 



,, „ posterior end 151 86-8 



Ileo-cpecal valve 154 88'5 



The tracheal membrane begins at the glottis, and for a short 

 distance lies along the right side of the tube. Almost immediately 

 it broadens, and at gastrostege 14 it is lined with respiratory 

 tissue. At gastrostege 22 the membrane alters its position so 

 that it forms the dorsal instead of the right wall of the trachea. 

 Well above the apex of the heart the alveoli on the membrane 

 have assumed the same size and shape as those in the lung; there 

 is no gross difierence to indicate the ending of one structure and 

 the bee-inning of the other. The trachea terminates abruptly 

 7 mm. posteriorly to the apex of the heart. There is no rudi- 

 mentary lung. Arteriorly the walls of the lung are thick and 

 lined for the entire circumference with pulmonary tissue ; 

 posteriorly they become thin and terminate in an air-sac. The 

 lateral lobes of the liver are distinct. The left lobe is the longer ; 

 anteriorly it extends beyond the right lobe 6 mm. and posteriorly 

 1 1 mm. There a,re four transverse fissures on the left lobe near 

 the anterior tip, the rest of the organ is smooth. The anterior 

 one-third of the rectum is thickly and regularly plicate ; the 

 posterior two-thirds are irregularly folded. There is no body to 

 the vaccina. The organ is bilaterally divided into two separate 

 tubes that open into the dorsal wall of the cloaca by two separate 

 orifices, which are 2 mm. apart. 



JSfotes. — This species is described as having scales with apical 

 pits, and an eye with a round pupil. Over a dozen specimens 

 have been studied and the pits cannot be made out. The pupil 

 is usually round in the young and frequently vertically oval in 

 the adult. 



Chrysopelea ornata Shaw. 



Siyecimen. No. 16707. California Acad. Sci. Cochin China. 

 Female; total length 910, tail 237 mm. 



Squamation. — The number of scale-rows on the body, the 

 sequence in which they become suppressed, and the gastrostege 

 level at which they terminate on each side may be thus 

 presented : — 



1 7 rows lY row ends, right 1 37th, left 1 36th gastrostege, leaving : 

 15 „ VlII „ „ _ „ 137th, „ 138th 

 1 3 which are coritinuous to the vent. 



