232 PROCEEDINGS OF THE ACADEMY OP 



to have had the same form as in Anchilherium. The inner lobes also have the 

 same form but are proportionately less robust, while the median lobes are 

 more so. Tlie postero-median lobe pursues the same course as \\x Anchilherium 

 and likewise, as in this, joins the outer lobes at their conjunction. From near 

 the middle of its course it gives off a process directed towards the interval of 

 the antero-internal and antero-median lobes and ceasing short of them. This 

 process looks as if disposed to join the contiguous portion of the antero-median 

 lobe, together with it to form a crescentoid lobe, embracing the antero-exter- 

 nal one, as in the corresponding columns of equine teeth. No such arrange- 

 ment exists in Anchitherinm. A triangular tubercle, as in the latter genus, 

 occupies the space at the back of the crown, and it appears as if its anterior 

 angle had a disposition to join the contiguous portion of the postero-median 

 lobe, to form with it a crescentoid lobe, in like manner as in the former case, 

 to embrace the postero-external lobe. 



The construction of the tooth clearly indicates an animal of intermediate 

 character to Anchitherium and Equus. 



Anchippodus riparius. 



Mr. Timothy Conrad has submitted to my examination the specimen of a 

 tooth of ratlier enigmatical character, which I suspect to indicate a pachyderm 

 at least with solipedal affinities. It was obtained by Dr. Knieskern, from a 

 tertiary formation, either eocene or miocene, of Shark River, Monmouth Co., 

 New Jersey. 



The tooth would appear to correspond with a first or second lower true mo- 

 lar of a ruminant, or with any of the series between the first and last molars in 

 Pahcotlierium or Anchitherium. The crown is much worn, even so as to obliterate 

 some of its distinctive features It is composed of a pair of demi-conoidal 

 lobes, one before the other, the plane side internally, the convex and sloping side 

 externally. From each lobe descends a fang in the usual manner. No fold, 

 and only a feeble basal tubercle occu[)ies the deep external angular interval 

 between the lobes. The worn triturating surface presents, on the anterior 

 lobe, a wide crescentoid tract of exposed dentine, slightly concave and bordered 

 with thick enamel, ftie anterior arm of the crescent is obtuse ; the posterior 

 extends less inwardly and is acute. The posterior lobe exhibits a half ellip- 

 spoidal tract of dentine, nearly straight at its inner margin, and bordered with 

 enamel, except behind, where it has all disappeared. The dentinal tracts of 

 the two lobes are separated by a narrow isthmus. The enamel is thick, black 

 and shining, and though it appears to have originally been more or less rough, 

 yet it is now nearly smooth. The measurements of the specimen in its pre- 

 sent condition are as follows : 



Fore and aft diameter of the crown 10 lines ; breadth of posterior lobe 

 obliquely at base of the enameled crown 9J lines; breadth of anterior lobe in 

 same position 8| lines ;. breadth of worn triturating surface of posterior lobe 

 6 lines ; breadth of do. on anterior lobe 5i lines. 



LOPHIODON OCCIDENTALIS. 



Dr. Hayden's last collection of Mauvaises Terres fossils contains a last infe- 

 rior molar tooth which has all the characters ascribed to the corresponding 

 tooth of the extinct tapiroid genus Lophiodon of European eocene foi'mations. 



The crown is composed of a pair of transverse hill-like lobes, as in the 

 lower molars of the Tapir with the addition of a well developed posterior 

 conoidal talon. The principal lobes have subacute summits slightly concave 

 transversely, their posterior surface sloping, their anterior surface concave, 

 and their exterior sides convex. The talon is about half the height of the 

 principal lobes, convex behind, and with the front surface inclining from 

 the middle on each side. The crown is bounded in front by a basal ridge. 

 Fore and aft diameter of the crown 9| lines ; transverse diameter in front Q\ 



lines. 



1 have a suspicion that this specimen belonged to the lowest bed of the 



[Oct. 



