496 CARNIVORES. 



out : the second (p 2) almost touches the posterior surface of the canine, 

 has a compressed conical, sharp-pointed crown, with an anterior 

 and posterior talon : the third (p 3) is similar but larger : the fourth 

 is the sectorial tooth, (fig. 4 & 5, p 4), with its blade divided into two 

 lobes, each pointed and inclined backwards, and it has a small 

 anterior talon, and a large, flat, semi-circular inner tubercle. The 

 true molar (ib, m 1) has a large rhomboidal grinding surface, with 

 two external cusps separated by a broad concave surface from two 

 smaller internal tubercles. The first (fig. 4, p 2), second {p 3), and 

 third {p 4) premolars of the lower jaw progressively increase in size, 

 and have similarly shaped, compressed, pointed crowns ; the last in- 

 creasing in breadth posteriorly, and having the talon there more 

 distinct. The first true molar (fig. 6, m 1) is essentially like that 

 of the Zorille, but is relatively broader, with a greater development 

 of the internal tubercle and posterior broad grinding surface : the 

 sectorial blade forms an accessory, rather than a principal, part of 

 the crown ; it is divided into two pointed compressed lobes. The 

 last true molar is relatively smaller than in the Civet, and has a 

 round sub-tuberculate crown. 



The Sea-Otter (PI. 128, fig. 12.) has one molar less on each 

 side of the upper jaw than the common Otter : the first small 

 premolar is the absent tooth, and the posterior molars are so re- 

 markably modified as to justify the sub-generic distinction proposed 

 for the marine species by the name of Enhydra marina. There 

 is nothing peculiar in the incisors or canines : the second pre- 

 molar {p 3) has a strong obtuse conical crown with a posterior basal 

 ridge, and is double the size of the first premolar {p 2) : the third 

 {p 4) is more than twice the size of the second, and represents the 

 sectorial tooth most strangely modified ; the two lobes of the blade 

 are hemispherical tubercles, the first the largest ; the crown of the 

 tooth is much extended inwards and is developed into a third similar 

 tubercle. The last upper tooth, which is the first true molar (m 1) 

 has a rather larger crown than the sectorial, and of similar transversely 

 extended triangular form ; but the base is turned inwards, and the 

 apex forms a hemispheric tubercle, the rest of the broad grinding 

 surface being irregular. In the lower jaw the teeth are not sepa- 



