first of these (the largest) is pear-shaped, and lined internally with a mucous membrane furnished with numerous villi ; the second (the smallest) communicates directly with the third, which is distinctly di- vided by numerous transverse folds into nine or ten small cavities. Continuing this third cavity, we find an intestinal canal which does not vary in size, and presents neither cœcum, colon, nor apparent rectum.
2. Bladder oblong, lengthened, proceeding from two ureters, which towards their extremity make a bend on themselves, communicating with a large gland, after which they direct themselves forwards ; the canal of the urethra is placed inferiorly.
3. The length of the windpipe unto its branching is 1 ft. 2½ in. ; from the orifice of larynx to the pharynx 5 in. ; length of the branches after bifurcation about 11½ in. ; each branch throws out about a do- zen ramifications. The termination of the pharynx is duck-bill shaped.
Osteology. The head of this species is well described by F. Cuvier, and still better figured ; there exist, however, some slight discrepan- cies between his specimen and mine.
The superior maxillary bones are very narrow, and united at their extremity to the intermaxillaries, which anteriorly protrude beyond and above them. In the inferior carena of the maxillaries, the vomer presents itself rather wide at first, but diminishes gradually in size posteriorly.
The intermaxillaries follow up the frontal bones to the top of the skull, where they curve forwards, forming small granular horns.
Between these two horns are placed the nasal bones, resembling in shape small approximating tubercles. The plate of the ethmoidal bone between the nasal fossae is very thin and sharp. Spiracle regular. Frontal hones nearly covered by the base of the superior maxillaries, so as only to show externally a narrow edge, which is seen extended from the temporal crests to the lachrymal bone. Frontal bone arched above the eye, and resting by means of a postorbital apophysis on a corresponding zygomatic process of the temporal bone, which is small. Malar bones short, slender, and awl-shaped, they articulate with the suddenly dilated portion of the maxillaries. Mastoid bones not large. Occipital bone depressed superiorly and in the middle, convex to- wards the temporal fossae, and again flattened along the temporal bone ; along this last depression on the posterior part of the skull, the occipital bone forms a double ridge, leaving a narrow medial ca-
