1. MANATUS. 357 



Manatina, Rnchh. Si/ii. Mam. 15. 

 Los Lamantins, Duvcrnoy, Tuh. Anini. Vert. 

 Trichecus (part), Artedi, Gen. Pise. 79 ; Si/n. 109. 

 Halicorea;, Bratult, Mem. Acad. PMersb. 1833, 103. 

 Rytineae, Brandt, I. c. 1833, 103. 



4 



yUrz^ U.,^JU^ i^c^cX^ U^^rt^^-^ '^/i^-'/ii 



Oxystomus, G. Fischer, Zoogn. iJJ. 



f Sii-en, Artedi, Gen. Piscitiin, 81, fi'om SjTene ; BarthoUni Hist. Anat. 



Rar. 

 Trichecliiis, Artedi. 



The number of grinders varies according to the age or state of the I ' 



specimens. "^Tien complete they are f . f ; but the three front on 

 each side are often deciduous ; hence Home (Phil. Trans. 1821, 390) 

 describes them as |^ . ^, and Cuvier as f . |-. 



Dr. Harlan obseiTos : — " Cuvier estimates the teeth at 30, nine 

 on each side ; in both my specimens they do not exceed 32, eight on 

 each side.'' 



In the very young skull in the British Museum, which has holes 

 for the rudimentarj- upper cutting or canine teeth, there are only 24, 

 viz. six on each side : and the two hinder on each side must have 

 been hidden in the gums. In the older skulls some have eight and 

 others nine on each side ; but in most of them only six on each side 



