RHYIIXIDiE. 15 



Family RHYTINID^. 



In this family (represented only by one species) there are no 

 functional teeth, their function being discharged by horny oral 

 plates. The premaxillse are moderately deflected, and distinct 

 nasals wanting. 



Genus RHYTINA, Illige^^ 



Rhytina gigas (Zimmermann^). 



Sjn. Manati gigas, Zimmermann ^. 



Tricliechus mmiatusj var. borealis, Gmelin *. 

 TrichecJms boi'ealis, Shaw^. 

 Rytina stelleri, Desmarest ^. 



Ilah. North Pacific. 



M. 2489. The nearly complete skeleton ^ (woodcnt, fig. 5) ; from 



{Fig.) the peat of Behriiig Island. Described and figured by H. 



Woodward in the Quart. Journ. Geol. Soc. vol. xli. p. 459. 



Purchased, 1885. 



M: 2489 a. The petrotympanic and auditory ossicles of the last 

 specimen. Parchased, 1885. 



^ Prodr. Syst. Mamm. et Arium, p. 141 (1811). — Bi/tina. 

 ^ Geogr. G-eschiclite, vol. ii. p. 426 (17^0). — Manati. 

 ^ Loc. cit. 



* Syst. Nat. vol. i. p. 61 (1788), 

 5 General Zoology, vol. i. p. 240 (1800). 

 « Nouv. Diet. d'Hist. Nat. vol. xxix. p. 574 (1819). 



"^ All the bones do not belong to the same individual, and some missing bones 

 have been replaced by plaster models. 



