Description of Menobranchus punctatus. 311 
at largest diameter, and tapered to 0.06 of an inch at pyloric 
orifice, which was situated about midway between the fore 
and hind legs. Intestine about 0.10 of an inch in diameter, 
receives the gall-duct at half an inch distance from pyloric 
orifice, and continues to the vent with little variation in dia- 
meter, and with two or at most three short convolutions. 
The whole length of alimentary canal, from commencement 
of esophagus to the vent, is about six inches. Vent longitu- 
dinal, half to three fourths of an inch behind the insertion of 
the hind legs. The spleen 0.28 of an inch in length and 
0.06 in breadth, lies behind the stomach and a little to the 
left. The pancreas 0.50 of an inch long, and 0.12 broad, 
sends its duct to enter the intestine just below the pyloric 
orifice. Liver dark brown, longitudinal, occupying the mid- 
dle line of the body, presenting itself on opening the body, 
and concealing the stomach, intestines, and great blood-vessels 
beneath, the lungs being visible on each side. Its length is 
two inches, extending from a point between the insertion of 
the fore legs toa point at about two thirds the distance from 
fore to hind legs ; its two lobes are separated by a superficial 
fissure. The gall-bladder is 0.25 of an inch long, about 0.60 
of an inch from posterior extremity of liver, and its duct enters 
the intestine, as alréady said, about half an inch from pyloric 
orifice. Dr. St, Julien Ravenel, in his examination, observed 
that the mucous membrane of the stomach, and of what may 
by analogy be called the small intestine, was thrown into 
longitudinal folds ; he also observed the relations of the spleen 
and pancreas, and the value of the presence of the latter. 
Respiratory AND CIRCULATORY SYSTEMS. Branchial tufts 
three on each side, each supported by a cartilage, leaving two 
Openings between the three cartilages ; the anterior of the three 
cartilages on each side appears externally just at the lateral 
termination of the cervical fold. Langs two, one on each 
side, cylindrical, with thin transparent parietes, resembling the 
ait-bladder of fishes, with vessels ramifying through their thick- 
