568 Selected Specimens of [Oct. 



Fig. 17, probably the rear molar of the right lower jaw; these 

 three present no remarkable difference from similar teeth of the 

 recent horse. 



Fig. 18, is the beautiful specimen from the marl formation in the 

 Kdlawdla pass, alluded to by Dr. Falconer, in his letter, read to the 

 Society on the 14th January, 1835. 



Fig. 19; the 2nd or 3rd right upper molar from the upper or sand 

 formation of the Sub-Himalayas : there is a slight difference between 

 the flexures of enamel of this, and of the fragments, fig. 1, of my 

 own collection, but not more than is perceptible between the several 

 molars of the present horse. 



From the above specimens, (if I may be allowed to generalize 

 from so few,) it would appear, that we have three varieties of upper 

 molars of the fossil horse. 



1st. From the *lower marl formation, (Kdlawdla pass,) fig. 18. 

 This tooth is distinguished from the recent, and from the Jamna 

 varieties, by the pillar, a, being detached from the rim of enamel 

 encircling the rest of the tooth, (as was remarked by Dr. Falconer,) 

 and from the 2nd (undermentioned) variety, by the comparative sim- 

 plicity of the flexures. 



2nd. From the sand formation, fig. 19. 



In this variety also, the pillar is detached, but more elongated, than 

 in the 1st; the interior flexures are remarkably complicated. 



3rd. From the bed of the Jamna, between Agra and Allahabad. 

 In this the pillar forms a part of the exterior rim of enamel : in shape 

 it resembles that of the 2nd variety, but the interior flexures are more 

 like those of the 1st. It appears doubtful, whether or not this last 

 variety will be considered identical with the existing species. 

 Fossil hog— PI. XLV1. figs. 20, 21. 

 The specimen represented by fig. 20, is in its substance so soft and 

 friable, that it was difficult, without destroying the fossil, to remove 

 even so much of the matrix as enabled me to take the accompanying 

 sketch. It must still remain in doubt, whether the exterior incisors 

 be wanting, or whether they be only concealed under the sand-stone, 

 covering the parts a, a. I am myself inclined to the latter supposi- 

 tion, from the close agreement in other respects of this fossil with the 

 lower jaw of a wild sow, lately killed in the Rdyawdla jungles,-, in 

 both instances the molars appear to have been very much worn. The 

 comparative sizes of the fossil, and the above-mentioned recent spe- 

 cimen, are 21 and 17. 



* An upper marl has also been met with, containing shells, and the teeth of 

 crocodiles. See remarks in page 565. 



