EXPLANATION OF PLATE CXXXIII.
The figures of this Plate arc intended to illustrate the structure of cetaceous animals, described in the preced ing pages.
Fig. 1. A view of the bones of the atlantal extremity, or swimming Paw, of the dolphin. a, the humerus ; b, the radius ; c, the ulna ; d, e, f. g, h, the metacarpus; k, 1, m, n, the phalanges of the lingers.
Fig. 2. A horizontal view of the tail of the piked-whale, figured in Plate CXX XIV. Fig. 2.
Fig. 3. The skull, jaws, and teeth of the dolphin.
Fig. 4. The usual position and form of the teeth in the physeter tribe.
Fig. 5. The tusk or horn of the narwhal.
Fig. 6. The general appearance of the horny plates of whalebone in the balxnx, shewing their relative situa tion, and the hairy edges in which they terminate.
Fig. 7. A view of the general form and proportions of the complicated stomach of cetacea, as seen in the por pesse ; a, the gullet, where it joins b, the first stomach ; cc, the second stomach add, the third stomach ; c, the fourth stomach ;f, the pylorus.
Fig. 8. A side view of the muscular and bony parts connected with the blow-holes in the dolphin ; a, the tongue, seen from above; bb, the nostrils ; c, the pharynx ; d, the larynx ; c, the left horn of the os hyoidcs ; f, the stylo-glossus muscle.
Fig. 9. A horizontal view of the same parts dissected, so as to shcw, a, the common opening of the blow-holes; b, the right membranous bag ; c, the left bag inflated ; dd, the second layer of muscular fibres attached to the membranous bags.
Fig. 10. A view of the organs of reproduction in the male porpessc ; a, the urinary bladder, seen from above ; bb, the ureters ; cc, the vasa drferentia ; dd, the com mencement of the two branches of the corpus cavcrild sum penis ; ce, the muscle which envelopes the prostate gland, and the beginning of the urethra ; ff, the two bones that answer to the pelvis of quadrupeds ; g the rectum ; h, the anus ; ii, the two retractor muscles or ligaments; kk, the glans ; 1, the external orifice of thf urethra.