1895.] 4.bd [Cope. 



suspect to belong to the M. sulcidens, as they differ from the corresponding 

 teeth of the M. harlanii in the same way as the penultimate inferior molar. 

 The penultimate inferior molar resembles closely tbat of the M. renidens, 

 but has the dimensions of the M. harlanii. The internal extremity of the 

 crown is beveled on the posterior border, so that an obtuse ridge charac- 

 terizes the posterior side of the crown, which is separated from the pos- 

 terior border of the external face. The latter is subtruncate. 



Dimensions. mm. 



( longitudinal 73 



Diameters J transverse (oblique) 27 



f aSteroposterior (in axis of jaw) 20 



The penultimate superior molars look as though they belonged to the 

 same individual, they so exactly agree. Their long diameter is obliquely 

 transverse to the maxillary bone, and the internal face is deeply grooved 

 as in other species of the genus, the anterior ridge being much less prom- 

 inent than the posterior. The character which distinguishes the tooth 

 from that of the other species is that the external aspect instead of being 

 regularly rounded is obliquely beveled posteriorly so as to produce an 

 obtuse angle on the posterior side within the posterior margin. This is 

 separated from the posterior internal rib by a shallow concavity. When 

 the tooth is held obliquely, as it was m the jaw, the external bevel is 

 parallel with a line connecting the two internal ribs or borders. 



•ans verse 26 



Diameters of penultimate m. iv } longest oblique 33 



( tra: 



) lon„ ^.., _ 



^ anteroposterior 16 



Equus intkrmedixjs, sp. nov. Equus major Leidy, Transac. Wagner 

 Free List. Science, ii, 1889, p. 88 ; (not of Dekay). 



Prof. Leidy described and figured as above cited a number of teeth of 

 horses from Petite Anse now in the collection of the United States Na- 

 tional Museum He refers them to the Equus major. They agree in 

 general with the teeth contained in the collection from Tulane University, 

 and, I think, cannot be identified with that spec.ies. The collection before 

 me includes a dozen superior molars of adult animals referable to five 

 individuals. Of these, five belong to the maxillary bone of one individual, 

 and two to the opposite side of another individual. There are several 

 superior molars of immature individuals, and numerous inferior molars of 

 adult and young animals, and a few deciduous molars. Accompanying 

 these are a symphysis mandibuli, with all the incisors in place, together 

 with a number of loose incisors. To these must be added numerous 

 bones from all parts of the skeleton, in good preservation. 



The molar teeth are as large as those of the E. major, and large forms 

 of the common horse. The enamel folds are less complex than those of 

 the former, but are more complex than is usual in the HJ. caballus, though 

 specimens of the latter can be found to match them. They are consider- 



FROC. AMER. PHTLOS. SOC. XXXIV. 149. 3 G. PRINTED FEB. 21, 1896. 



