390 SURG. J. C. THOMPSON ON THE 
median line. The highly differentiated intromittent organ. 
Finally the ugly and fierce disposition. 
Specimen.—Brit. Mus. Nat. Hist. Ex. No. 713-17 a.  Bala- 
kappan, Dutch Borneo. Adult male. 
The trachea terminates abruptly at the 65th g. There is no 
trace of an intrapulmonary bronchus, the last vestige, the linear 
arrangement of the air-cells even being absent. The intercarti- 
laginous membrane is black, and in sharp contrast to the white of 
the cartilages. Hach end of a cartilage where the ring is in- 
terrupted by the membrane is free to the extent of -5 mm.; this 
gives a comb-like appearance to the line of junction of the 
cartilaginous and membranous portion. The tracheal membrane — 
is not extensively developed, being uniformly about 2 to 3 mm., 
and at the base of the heart 4 mm. wide. Anteriorly it lies 
along the right and posteriorly along the dorsal side of the 
trachea. It is bare to the 49th g., where it acquires a lining of 
air-cells that posteriorly become continuous with those of the 
lung. 
The body-cavity beneath the trachea from the level of the 
paired gular shields to the base of the heart is converted into an 
air-chamber. This structure gives the impression of crowding 
and filling all the available space. The walls are of stout 
connective tissue and are closely bound to the surrounding 
structures. The air-chamber is divided into fifteen separate com- 
partments by connective tissue bulkheads that are imperforate. 
The position of the posterior wall of each compartment in terms 
of gastrosteges is as follows:—I.-3; IT—8; IT1.-13; [V.—18; 
V.-23; VI-26; VII-31; VIII-36; IX.-39; .X.-42; 
X44 = OX 49 = X= 52 XT VR a4 = XeV 565 “Thesaiver 
compartment is in relation laterally with the vena cava and the 
carotid artery and posteriorly with the base of the heart; it even 
sends a prolongation for a few millimetres along the ventral surface 
of the pericardium. Compartments XII. to XV. cease to be 
attached to the parieties and lie between the vessels of the neck 
a the trachea. Hach compartment opens into the trachea by an 
aperture ; in several cases there are two and even three openings. 
These apertures are situated on the tracheal membrane, close to 
the ventral row of cartilage-ends. They are oval, with the long 
axis in the sagittal plane, from 2 to 3°5 mm. in diameter, and 
extend over the space of several tracheal cartilages. Where they 
exist, the cartilages terminate flush with the rim of the opening, 
and do not have the free extremity that is present elsewhere. 
The first structure of this nature was discovered by Dr. Beddard * 
in Ophiophagus. In the Hamadryad it is dorsal to the trachea, 
whereas in Gonyosoma it is ventral. 
The right lung extends posteriorly to the 230th g., which is just 
four shields anterior totheanal. It is one of the longest recorded 
in a Colubrine and resembles Coluber corais in this respect T 
* P.Z.S. London, 1903. vol ii. p. 319. 
+ Beddard, P. Z.S. 1906, p. 520. 
