86 E. S. Lull — New Tertiary Artio dactyls. 



The material upon which this description is based is 

 practically perfect, although pertaining to many individ- 

 uals and so intermingled that with the exception of two 

 mandibles of which the teeth show a peculiar and abso- 

 lutely symmetrical wear, one can not be sure that any two 

 bones belong to the same individual. There is a palate 

 with teeth as well, in which the wear is also identical. 



Some idea of the profusion of animals can be gained 

 from certain figures of which the first two represent the 

 minimum numbers possible, not the maximum. 



Left astragali 39 



Right " 36 



Right proximal metapodials 95 



Left " " 99 



The last, which have not been separated into front 

 and rear, must represent at least 48 and at most 194 

 individuals. Of skulls, 19 or more are represented, 16 

 of which, in addition to an endocranial cast, are of 

 diagnostic value. 



Out of this profusion of bone, every element of the 

 skeleton has been recognized, including the vestigial 

 second and fifth digits, and the hyoids, the only exceptions 

 being the first cuneiform, certain ribs, sternals, and the 

 caudals. This being the case, it was possible to make a 

 composite mount of the animal embodying every element 

 except the two first cuneiforms, the caudals, and all but 

 two or three sternals and several ribs. This mount, 

 which includes some unusual features, will be discussed 

 in greater detail below. 



Much of the material is in excellent preservation, al- 

 though the skulls have suffered most, both from erosion 

 and from crushing. The limb bones are generally broken. 

 The teeth for the most part are beautifully preserved. 



Description of Mount. 



The restoration of Aleiomeryx here shown (pi. I, and 

 text fig. 1) has some unusual features Avhich are, per- 

 haps, worthy of notice. As far back as 1910, I essayed a 

 restoration of the Connecticut Triassic dinosaur Anchi- 

 saurus colurus, in which the fragility of the bone and 

 obdurate character of the matrix made the removal and 

 mounting of the bones impracticable. I therefore made a 

 model, one third linear dimensions, in which the skeleton 



