580 



THE A M ERIC A X X ATI R. \ 1. 1 S T [\'ol. XL 



The caudal portion of the body consists of a horizontally flat- 

 tened fin, with a very slight indentation at the posterior margin. 

 Its breadth is from 77 to 82 cm., and on this point Raffles and 

 Owen also agree. There is no indentation in the shape of a half 

 moon such as Rapp, Riippel, and Brehm mention, but the posterior 

 margin is feather-edged and often is considerably torn. Accord- 

 ing to Owen the tail is relatively larger than in the whales, and this 

 he explains as due to the frequent necessity for coming very quickly 

 to the surface for breath while feeding. 



LITERATURE 



BiSCHOFF, T. L. W. 



'47. Einige Beitrage zur Anatomie des Dugoiigs. Mulhrs Arch. /. 

 Anat., pp. 1-6. 



'91. Ticrlebeii, .3. Aufl. v. Pec-huel-Loesche : Siiugetioro, 3. Hd.. Leipzig. 



'78. The Sireiiia. .4 mcr. Nat., vol. ] 2, pp. 291-20^. 

 Dexler, H. 



:02. Bericht iiber eine Reise naeh Australien. Deutsche Arbeit., vol. 

 1, pp. .5.52-.562. 

 Dexler. H., and FREi xn, L. 



:06. ('oMtributions of the Physiology and Biology of the Dugong. 



Fairholmk. .1. K.'e. 



FiNSCH, O. 



:01. Der Dugong. Zn<,l. rthn. Skizzr ••in.',- nu\vvz.-\u'u.\ru Siivn,.. 

 Samml. gem. n r^t V.nh , //,,'■/;,,!,/,„ .y,,,,., n ;-,) Hatu- 

 burg. 

 Frevni), L. 



:04. Die Osteologie der Hali 

 77, pp. 36.3-397. 



