1897.J 



ANATOMY OF A MANATEE. 



51 



differently by various observers. Owen states that they are 

 lobulated, thus differing from the Diigong which has non-lobulated 

 kidneys. Murie describes the kidneys in the following words : — - 

 " Each renal organ in our female is 5 inches long, the two lying 

 opposite one another. Their figure is simple, with only a super- 

 ficial indication of lobulation, but in reality absence of division ; 

 hilus shallow." I found the kidneys in the larger of the M. lati- 

 ■rostris examined by me to be six inches in length by three in 

 breadth ; they are distinctly lobulated externally (fig. 4), and before 



Kg. 4. 



Kidney of Manatus latirostris, 

 U, ureter. 



the kidney was divided longitudinally the appearances shown in 

 the accompanying drawing were visible. The lobulation after the 

 organ has been cut in half is seen to descend right to the middle 

 reservoir of the organ, the cortical layer dipping down and com- 

 pletely shutting off the compartments of medullary substance. 

 The hilus is on the side of the kidney and not on its inner edge. 

 On the other hand, in the small example of M. latirostris the 

 kidney, measuring nearly three inches by one and a half in breadth, 

 showed no traces whatever of lobulation, and the hilus was as 

 nearly as possible on the edge of the gland. In Manatus inunguis 

 the shape of the organ, as may be gathered from its measurements, 

 is rather different. It measured three and a half inches in length 

 by two and a quarter in breadth, and showed no traces of lobu- 

 lation. The hilus was on the side as in the large 31. latirostris. 

 The seeming variabOity (or is it an unusual change due to age ?) 

 of 31. latirostris is remarkable. 



The heart of the Manatee is, as is well known, peculiar by 



4* 



