A P P E N D I X I. 49
CC. The muscles which surround the poison glands.
DD. A portion of the poison glands exposed.
EE. A pair of muscles which rise f rom the neck, and terminate in the head.
F . One of a pair of muscles which bring the head back.
GG. The skin divided in the middle line of the back dissected from the muscles, and turned on each
side.
I-IH. T h e intercostal muscles.
I I . The muscles which bring forward the skin of the back upon the neck to form the hood. They
arise f rom the ribs, and are inserted into the skin.
KK. Muscles which raise the ribs: they originate from that part of the rib near the spine, pass over
two ribs, and are inserted into the rib below near its extremity.
LL. Muscles which raise the ribs; arising f rom one rib and passing over the next, to be inserted into
t h e ri b below.
MM. The intercostal muscles.
Fig. 5. A front view of the neck. The parts are dissected to shew the mode in which the ribs lie in their
depressed state; also the muscles by which they are depresssed, and those which bring the skin
back into its natural state.
AA. The two portions of the lower j a w separated from each other, and turned aside.
BB. The poison fangs.
CCC. The ribs in their depressed state lying over each other on the side of the spine.
DDD. The ribs on the opposite side in their extended state: their extremities become the boundary
of the hood, and give it an oval form.
EE. A pair of muscles ivhich bring the head forward upon the neck,
FF. The intercostal muscles.
GG. The muscles which bring the ribs downwards upon the spine.
HH. The muscles which bring the skin backwards from the neck ; they have their origin froin the
p o i n t s of the ribs, and are inserted into the lower edge of the abdominal scuta.
II. The abdominal scuta divided in the middle line of the belly.
KK. The muscles which go from the lower edge of one scutum to the lower edge of the scutum over
it, to bring the scuta closer together, and make them overlap.
LL. An internal view of the skin of the snake beyond the abdominal scuta.
No. II.
Observations on the Orifices found in certain Poisonous Snakes, situated between the Mostril and
the Eije. Bjj P.\TI!IOK RUSSELL, M. D. F. R. S. With some Remarks on the Stnictiire of
those Orifices, and the Description of a Bag connected with the Eye, met with in the same
Snakes. By EVERARD HO.ME, Esq. F.R.S.
Read before the ROYAL SOCIETY, F ebrua r y 2, IS04.
I N the description of the Fer-de-lance, or yel low snake of Martinico, the Count de la CEPEDE has remarked
a n orifice on each side of the head, between the nostril and the eye, which had by some naturalists been conceived
to be the external organ of hearing ; but not having an opportuni t y himself to ascertain the fact by
dissection, he recommends it as an interesting object for future investigation.""