1466 Cetacea. 



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 coecum, 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. 2j in. ; 

 from the orifice of larynx to the pharynx 5 in. ; length of the branches 

 after bifurcation about llj 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 bones 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 fossa?, 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- 



