326 PKOCEEDIKGS OE THE GEOLOGICAL SOCIETY. 



Another illustration of the same tooth, a right upper, may he 

 cited in a British Museum specimen, no. 156 of the Palseontol. Cat. 

 The crown is composed of eleven principal ridges, besides talons ; the 

 six anterior ridges are worn. 



The dimensions are — inches. 



Length of crown 3'7 



Width in front 1-4 ^ 



Greatest width , 1'9 



Height at sixth ridge 3-0 



A third illustration is afforded by a germ-specimen of a left 

 molar from Kent's Hole cavern, in the Museum of the Geological 

 Society. The crown is composed, besides talons, of twelve principal 

 ridges, of which the first alone is abraded, the rest being intact. 

 The dimensions are — inches. 



Length of crown 4-6 



Greatest width, at second ridge 1"8 



Height at second ridge ; 4*0 



Numerous other examples of this tooth might be cited, present- 

 ing either eleven or twelve ridges, with talons. De Blainville de- 

 scribes it as being composed of eleven, and Professor Owen of from 

 twelve to fourteen ridges, the talon-plates in the latter case being 

 probably taken into the reckoning. 



b. Lower Milk-molars. — Of the lower milk-molars, the antepe- 

 nultimate, or most anterior, is exceedingly rare in collections. An 

 illustration of it is furnished by the specimen figured and described 

 by Kaup, under the name of Ch/mafotherium antiquum. Like the 

 corresponding rudimentary tooth in the Indian Elephant, it is in- 

 ferred to be composed ordinarily of few ridges. There is a speci- 

 men in the British Museum (no. 33,403), from Mr. Layton's col- 

 lection*, which contains the sockets of the two anterior milk-molars ; 

 but the crowns are wanting. 



Of the penultimate milk-molar of the lower jaw, there is a fine 

 specimen in the Taunton Museum, from one of the Mendip caves, in 

 perfect preservation, with the fangs present and the crown worn. 

 It is composed of seven principal ridges, besides front and hind 

 talons ; the latter is so large that the crown may be regarded 

 as comprising eight principal ridges without a hind talon; the 

 grinding-surface presents no inequalities in the shape of raised 

 machjEridcs, the cement, ivory, and enamel being on a uniform 

 level, as if polished. 



The dimensions are — inches. 



Length of crown 2-3 



Width at second disk 0-9 



Greatest width, behind 1'4 



From these dimensions it is seen that the crown is narrow in front 

 and about half an inch wider behind, yielding somewhat of an 

 ovate outline. Other illustrations might be cited, in which the 



* This specimen is probably from Happisburgh, and has evidently been in 

 llic sca. 



