RHINOCEROS. 591 



end of the fang the truncated apex : the crown, which is very 

 short and thin in proportion to its breadth, usually commences 

 by a sudden expansion, and terminates before it has suffered much 

 abrasion, by an oblique trenchant edge, directed vertically down- 

 wards ; they are less parallel in position, and are thicker in the 

 Indian than in the Javanese one-horned Rhinoceros ; they are a 

 little smaller in the Sumatran two-horned species (PL 138, fig. 12, 

 i \). The external incisors are very small in all the above-cited 

 species ; and are lost before the animals attain maturity. They 

 are each seven lines in length and two in breadth in the skull 

 of a nearly full-grown Sumatran Rhinoceros (ib. i 2), and are situated 

 close to the suture with the maxillary bone. In the nearly allied 

 extinct Rhinoceros Schleiermacheri Dr. Kaup found them with an 

 enamelled crown of four lines extent, which is longer than in the 

 Rh. Sumatranus : the large mid-incisors of the Rh. Schleiermacheri 

 are about two inches long, with a crown one inch and a quarter 

 broad. In the Rh. incisivus (PI. 138, fig. 1) these incisors have been 

 found of nearly four inches in length, and with a short, oblique 

 crown measuring upwards of two inches in breadth, but are relatively 

 thinner. 



The large external inferior incisors are procumbent, or project 

 almost horizontally from the angles of the symphysial end of the 

 lower jaw ; in the Sumatran Rhinoceros the crown is an inch and 

 a half in length, almost flat above and on the outer side, and convex 

 below. The enamel is only laid upon the under and outer sides, 

 terminating by a sharp edge along the inner part of the crown, 

 and at its rounded termination. In the Javanese Rhinoceros they 

 have a more definite trihedral form, and terminate anteriorly in a 

 sharp-point : they are relatively thicker than in the Indian species 

 in which Cuvier(l) has figured them as w^orn down to a thick 

 truncated base. The small mid-incisors of the lower jaw are 

 relatively larger and longer retained in the Rhinoceros Schleier- 

 macherii^), the outer incisors resemble those of the Rh. Sumatranus. 

 In the Rh. incisivus (PI. 138, fig. 1) these teeth acquire their greatest 



(1) Loc. cit. PI. II, fig. 4. 



(2) Kaup, loc cit., tab. xi. 



