R. BROWN ON THE CETACEA OF GREENLAND. 89 



In some animals which I examined the bone was quite eaten 

 away by them, and that portion of the lining membrane which 

 remained was red or inflamed. There is a curious anastomosis of 

 reticulating venous blood-vessels inside the lining membrane of 

 the thorax and abdomen and around the spinal cord, which has 

 doubtless a relation to its amphibious life. The blow-holes are 

 placed directly on the top of the head, large, semilunar, opening 

 on either side into two sacs lined with a dark mucous membrane ; 

 these openings, again, leading to the bronchisB and the lungs. The 

 blow-hole has but one opening externally, but about an inch 

 down is divided into two by a cartilaginous septum, continuous a 

 little further down with the bony partition seen in the skull. The 

 rima glottidis is exactly described by the late Prof. Fleming, in 

 the ^'Wernerian Trans." (vol. i. p. 146). The female (except 

 in very exceptional cases) has no *' horns"; but inside the inter- 

 maxillary bone are two undeveloped tusks^ each about 10 inches 

 long, rough, and with no inclination to a spiral. On the other 

 hand, the undeveloped tusk (the right) in the male is smooth 

 and tapering, and "wrinkled" longitudinally. Double-tusked 

 ones are not uncommon ; I have seen them swimming about 

 among the herd, and several such skulls have been preserved. 

 Among others, there is a specimen presented by Capt. Graville, in 

 the Trinity House, Hull,* another in the University Museum, 

 Cambridge ; and, according to Mr. Clarke, nine others in Conti- 

 nental museums. Of course there is no whalebone in its jaw ; 

 but it is interesting to notice the laws of homology of structure 

 (as I think) kept up. On the sides of each gum are transverse 

 markings, either corresponding to the alveoli of the teeth or to 

 the position of the laminae of the whalebone in the BalcenidcE. 

 The under jaws are very light and quite hollow posteriorly for 

 half their length, as in most species of Cetacea ; this cavity is filled 

 with a very fine blubber. The tongue is regularly concentrically 

 grooved and attached its whole length, so as scarcely to be recog- 

 nized as it lies flat on the base of the mouth ; the roof of the 

 mouth is correspondingly marked. The lungs are each about \\ 

 foot long ; the kidney 9 inches long and about A.\ inches broad ; 

 the lacteals were very distinct and distended ; the large intestine 

 at broadest about 4 inches in diameter, at thinnest about l\ inch, 

 and about 60 feet in length. 



The pectoral Jin is not notched below (as would seem from the 

 plate in Hamilton's book on Whales), but smooth and entire ; 

 curved below, the greatest curve pointing posteriorly, but with the 

 thickest part of the fin anteriorly. The animal was greyish or 

 velvet-black, with white spots, sometimes roundish, but more fre- 

 quently irregular blotches of no certain outline running into one 

 another. There were no spots on the tail or fin ; waxy-looking 

 streaks shaded off on each side of the indentation of the tail, which 

 is white at the line of indentation. The ridge along its back 

 corresponding to the dorsal fin is of a uniform height of 1 inch 



* One of the tusks is 3 ft. long, and the other 4 ft. 



