ANATOMY OF THE OPHIDIA. 389 
ZAMENIS FLORULENTUS Geoft. 
Specimen.—Brit. Mus. Nat. Hist. Ex. No. ’13-5. Blue Nile, 
Soudan. Adult male. 
The tracheal membrane lies on the left side of the tube, and is 
narrow, being 1°5 mm. wide at the base of the heart. The air- 
cells begin at the 40th g. The trachea terminates at the 50th g. 
The remnant of the bronchus continues as a fine intrapulmonary 
streak of fibrous tissue as far as the anangious region. The right 
lung is without a free apex ; the air-cells extend to the 66th g. 
A vestige of the left lung is present at the 50th g.; it is without 
air-cells or an opening into the trachea. 
The vertebral artery leaves the right arch of the aorta at the 
43rd g. and enters the parieties at the 35th. It has four inter- 
costal branches which enter in the median line: I.-43; II1.—41; 
I11.-39; IV.-37. The right aorta extends from the 43rd to the 
5ist g. It has two intercostal branches: I.—45; I1.-49. 
The external landmarks of the principal viscera in terms of 
gastrosteges are as follows :— 
(CASIROSIOHES Sentecssaccbncneenace 197 100 per cent. 
Jal@nien, GOSS Fouaasys WEA W nent 48 24-4 
NGI VET UNM a acne ce lasccmes: 56 28°5 
cto MUGEN gk ts 3 er eta ONS SAIN ae 96 48-7 
Gall-bladder ............. Cotscee 124 62:9 
ARSSeTS, SAElANG, WOb secucc ssc doodboo- 144 Ce 
=H iel(s hac maya nek eine rca ear 148 75°2 
5) Wiel esas Nail ah gaaae mee meen 158 80:2 
3 Pos) 06 IR geen er Een Ac 162 82°3 
TAGhNe iy, TENE NES Hl Oso sdneoaden asc 166 84:2 
“3 PSR HCSi 010 RSE es 179 90°9 
5 Neht sulpaeessee acre Way 90 
- Basra Wie eea sane ciao 189 96 
The number of scale-rows, the sequence in which they are 
suppressed, and the gastrostege level at which they terminate, are 
as follows :— 
Neck. 
23 rows, LV row ends, right 11th, left 10th gastrostege, leaving: 
Body. 
2lrows, IV row ends, right 120th, left 120th gastrostege, leaving: 
IGG) easel ea] 2 Bl ae teen “ LePial, Wezel 
Tene ee D Gia -  Wiatiecl, . USahec! 
15 ,, which are continued to the vent. 
9? 9? 
99 9) 
CoLUBER OXYCEPHALUS Bole. 
The salient characters of this serpent are as follows:—The 
system of air-chambers opening into the trachea. The length of 
the right lung and the considerable development of the left; both 
lungs are larger than in any Colubrine as yet recorded. The 
intercostal branches of the vertebral artery do not all enter in the 
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