402, ON THE ANATOMY OF THE OPHIDIA. 
pulmonary and tracheal branches. The pulmonary branch is much 
the smaller ; it runs along the left lung, at first to the left, then 
down the centre of the bronchial band. The tracheal branch 
runs anteriorly along the tracheal membrane. 
The first portion of the descending limb of the left aortic arch 
lies to the right of the left ventricle; this would be equivalent to 
lying on the ventral surface of the heart were that organ not 
rotated. The left aorta crosses to the left side ventrad to the 
space between the heart apex and the liver tip; it then winds 
around the cesophagus at the 46th g. and continues closely 
adherent to and beneath the lung just to the left of the bronchial 
band. The few intercostal arteries noted enter in the mid-dorsal 
line. There is a single spermatic artery on each side. There are 
nine right and ten left renal arteries: these are short and enter 
directly. The iver is situated almost entirely to the right of the 
median line; like the heart it also is rotated on its long axis; 
the right lobe is dorsal to the left and posteriorly is 3-5 mm. 
longer. The hepatic duct joins the cystic duct at the 85th g. and 
the common duct enters the ventral surface of the pancreas. The 
parietal peritonewm is greyish-brown; the visceral coverings are 
but slightly tinged with the exception of that on the testis which 
is very dark. 
The external landmarks ot the principal viscera in terms of 
gastrosteges are as follows :— 
GaStroshemres. oes. cn jcceraeennts 145 100 per cent. 
Heart apex...... sinc enlace Rept seated 42 29 
Vier AUD mess tec ecea eee: see 4] 28:3 
ova ol 89 a1 Raaes sl SESH a TRA HE eS 72 49-7 
Gail) add Cru snout emergent 85 D713 
Me shisseri& libs supe were cee 95 65°6 
ye Ae OUNCE hist cimean tava 100 69 
PRS elUs UL Open. carc nce hee 105 72°5 
i amg Cl tera a, te eye 109 15-2 
IKerdimeye nto bi pp eaerceee ese 108 (4:5 
a Hefei! WSN Nee aS: SI, 138 95-2 
3 KS erin Oe eaeeR See ese 116 80 
oS SH C1216 Uae Amat SS le) 95:9 
The scales are in 19 rows anteriorly, decreasing to 17 and 
finally to 15 rows posteriorly. Gastrosteges 145, 
