Kneeland on the Anatomy of Crocodilus lucius. 113 
The diameter of the oviduct, 4 inches from the cloaca, was 2 
inches ; thence it decreased in size. "The openings into the 
cloaca were surrounded by wart-like ragged excrescenses ; 
they were about 2} inches from the anus. 
The cloaca, cut open, was 5 inches wide; the openings of 
the oviducts were 3 inches apart, on the sides of the cloaca ; 
the ureters were two-thirds of an inch apart, on the posterior 
portion. 
The opening of the larynx was a longitudinal fissure, an 
inch in length, bordered by prominent lips; no epiglottis ; 
from this to the division of the trachea, 17 inches. The tra- 
chea consisted of about 60 rings; it was seven-eighths of an 
inch in diameter at the top, and one-half an inch at the bifur- 
cation. ‘The two terminal divisions of the trachea did not di- 
vide into bronchial ramifications, but terminated abruptly by two 
or three orifices in the general pulmonary cavity of each side. 
Each lung consisted of three principal cavities, communicat- 
ing freely with each other; the walls were divided and sub- 
divided into innumerable cells, the fleshy compartments of 
Which formed with each other very intricate and interlacing 
net-works, resembling the columns carnez of the heart. The 
structure of such a lung will fully explain the coldness of the 
blood and the muscular inactivity of the reptile. "There was 
no diaphragm. 
The Aeart is by far the most interesting organ, as it shows 
an approach to, and, as it were, the sd iacta link with the 
birds and mammalia. 
In all reptiles, with the exception of the genus Crocodilus, 
the heart consists of but three cavities; one ventricle and two 
auricles ; the ventricle receiving both arterial and venous blood, 
and sindieg this mixed fluid over the system at the same time 
that it sends to the lungs blood, a portion of which has just 
circulated through them. The heart of the Crocodilus has 
a complete partition across the ventricles so as to form four 
cavities, and the circulation is so arranged that while the 
and anterior half of the body pec pure arterial blood, 
JOURNAL B, S. N. H. SEPT. 1849. 
