344 Perf. OwEn’s Description of the Lepidosiren annectens. 
stomach and right ovarium, chiefly in the anterior undivided part of tbe ab- 
dominal cavity, but extending about half an inch beyond the commencement 
of the peritoneal mediastinum : it is convex externally, and concave towards 
the alimentary canal, measuring two inches three lines in length, and eight 
lines in width. It is of a light brown colour, having its peritoneal coat speckled 
with dark brown spots. The gall-bladder* is lodged in a notch on the ante- 
rior surface of the left margin of the liver; it is sunk in the substance of the 
liver, with part of its surface exposed. The gall-bladder receives the bile by 
two cyst-hepatic ducts which enter its cervix, and the secretion is carried to 
the intestine by a single, short, but moderately wide cystic duct+, which ter- 
minates close to the pylorus, and by a similar but smaller valvular projection. 
Most of the veins of the abdominal viscera and of the abdominal parietes 
contribute to form the vena porte: the hepatie veins are four or five in num- 
ber, but there isa principal one +; which emerges from the anterior part of the 
liver and forms the vena cava. This great vein, with three other yascular 
trunks, viz. the aorta, pulmonary artery, and pulmonary vein, penetrate the 
septum which forms the anterior wall of the abdominal cavity. This septum 
is formed by the fibrous membrane of the abdomen, which is then continued 
around the pericardium, to which it is united by a cellular medium: a portion 
of it is seen reflected in Tak. XXV. fig.1, d. After dissecting away this fibrous 
sumie the true pericardium § is brought into view : it is protected by the cora- 
coid bones, which meet below it: one of these is seen turned back in fig. 3, . 
Tas. XXV.; 
and the pericardium is removed on that side so as to expose the 
Circulating and Respiratory Systems. 
The heart || consists of a single auricle, a ventricle, and a bulbus arteriosus. 
40805 ; one on the right, the other on the left 
hin ivo. nates in the right side of the auricle; it is joined 
y uperior cavæ and by the single large pulmonary vein: this veintt 
* Tas. XXV. fig. 2, g. T Ib. fig. 2,4. t Ib. i 
| Tas. XXV. fig. 3, a & 5. J Tas. XXV 
Sf men dh : I. fig. 2, a. 
$ Tas. XXV. fig. 1&3, e. 
** Ib: fig. 2, ¢. 
