1808.] DR. J. E. GRAY ON THE SUID^. 45 



lated, with a produced lower edge, making the skull appear higher 

 thau the skull from an animal with all its teeth iust developed, as 

 720A. "' ^ 



2. DiCOTYLES. 



Skull — side of the face in front and on the under side of the orhits 

 flattened, with a well-marked ridge on its lower edge ; orbits small, 

 incomplete. The longitudinal ridge on the cheeks bent up in an 

 arched manner in front of the orbits, and then slightly indicated 

 parallel to the Hue of the forehead, becoming a large concavity on 

 the cheek beneath. Teeth large (see Blainv. Oste'ogr. Onguligr. Sua, 

 t. 5, figured as Sus torquatus). Tail rudimentary ; caudal vertebrae 

 nine (Gerrard). 



DiCOTYLES LABIATUS. B.M. 



Black-brown, varied with yellowish ; no neck-bands ; lower jaw 

 white. 



Sus tajassu, Erxleb. S. Reg. Anim. i. 185. 



Sus albirostris, lUig., Licht. Verz. d. Doubl. Berl. Mus. 3. 



Dicotyles labiatus, Cuv.R. A. i. 237; F. Cuv. Dent.Mamm. 210, 

 t. 86. f. 2; Mamm. Lith. xxvii. t. ; P. Z. S. 1848, p. 70, 1860 

 p. 262. 



Sus labiatus, Gerrard, Cat. Bones B. M. 281 ; Blainv. Osteogr. 

 Onguligr. t. 3 (foot;. 



Bicotyles albirostris, Wagner, Schreb. Saugeth. Suppl. iv. 306 ; 

 V, Z. S. 1860, pp. 262, 442, 443. 



D. torquatus, Blainv. Osteogr. Sus, t. 5 (skull). 



Cliche, Oviedo, H. N. de las Indias, p. 21. 



Saynos, Acosta, H. N. de las Indias, p. 287. 



Tayacutericus, Laet. Nov. Orb. 551. 



Tagnicati, Azara, Paraguay, i. 25. 



Hub. South America ; Guiana, Brazil, Paraguay, Peru. 



The skulls are shorter, and the ridge on the cheek is not so large 

 and distinctly marked in younger animals as in the adults. The 

 alveolus for the hinder grinders, which are about to be developed, 

 is a kind of sheath with a slit along the middle of its exposed side. 



The skulls of the young animals changing their teeth sometimes 

 show two small conical canines ou each side of the upper jaw, as 72 1 a, 

 721 b. 



II. The premolars deciduous, their place being supplied by the 

 development of the molars. 



Fam. 3. Phacochcerid^. 



Grinders formed of laminae, with numerous roots. Canines cylin- 

 drical, conical ; the upper bent upwards. Eyes and nostrils ou a 

 level with top of head. Young not streaked. 



liab. Africa. Lives floating among reeds. Intermediate between 

 Suidce and Hippopotamidee. 



