ANATOMY OF THE OPHIDIA. 387 
Te 6 Ven NE 22 Vil 2 and) one: to the 
cesophagus: I.-23. 
The eaternal landmarks of the principal viscera in terms of 
gastrosteges are as follows :— 
CARTTOSHEROS  pabodnassednes5060000 168 100 per cent. 
JBLGATA AY DEK a coocecsn0b spsoncgoo02ee 30 20°9 
JLANTEIE HID” \pacosodondoacevoeongdane AT 28 
55) hang S1OK leas Sam coenGs SacweepEE ose 77 45°8 
Gallebladders repent etc. 99 59 
TR GlINi 7 TMEANG, GN) aeceonoobeocce 135 80-4 
ue Wee MING ee ay a ciaacacadels 155 92°2 
ss Webb satuon ones e soce 142 *84°5 
LA Ca Bigg 1010 bag SPR Seat me 160 95:2 
The parietal plewra is pigmented along an irregular line on the 
flanks. The parietal peritonewm is darker and the pigment is 
more diffused until at the level of the pancreas it is quite black. 
The visceral peritoneum covering the liver is slightly darkened. 
The number of scale-rows on the body, the sequence in which 
they become suppressed, and the gastrostege level at which they 
terminate may be presented thus :— 
Neck. 
19 rows, IV row ends, right 5th, left 136th gastrostege, leaving : 
Body. 
17 rows, IV row ends, right 94th, left 95th gastrostege, leaving : 
15  ,, which are continued to the vent. 
ZAMENIS RHODORHACIS Jan. 
The salient characters are:—The sequence of suppression of 
the scale-rows which is first No. IV, then IX, and finally 
VII ;—over one hundred species of Colubrine snakes have been 
examined for this character, and this is the only one recorded 
with this formula. The caudad position of the heart. The 
attenuated liver. The of distance the gall-bladder from the 
liver,—fifteen gastrosteges, while it 1s usually ten in a Colubrine. 
Specimen._Brit. Mus. Nat. Hist. Ex. No. ’13-7a. Aden, 
Arabia. Adult male. 
The tracheal membrane lies along the right side of the tube 
from the glottis to a little before the base of the heart where it 
becomes dorsal; it is narrow throughout and lies in a lax state, 
the interrupted ends of the cartilaginous semirings being in 
apposition ; it is not attached to the extremities of the carti- 
lages, but along a line about °5 mm. distant. The aiv-cells begin 
at about the 55th g. The trachea ends abruptly at the 62nd ¢., 
there being no trace of an intrapulmonary bronchus. ‘The left 
lung is completely suppressed. The right lung loses the lining 
of air-cells at the 77th g. Thereis an apex 3 mm. long, attached 
to the left side of the trachea and communicating with the lung 
by a restricted opening. 
Proc. Zoou. Soc.—1914, No. XX VI. 26 
