50 

 Belly River series, Red Deer river,jl901. 



Many small teeth of the Megalosawroid type have been collected from these beds. 

 Probably some of them will be found to belong to other species of this genus described 

 by Cope. 



ORNITHOMIMIDiE. 



Ornithomimus, Marsh. 



Ornithomimus altus. Sp. nov. 



Plates XIII and XIY, and plate XV, figs. 1-8. 



A hitherto undescribed species of dinosaur, belonging to the Ornithumimidm and 

 referable to the genus Ornithomimus of Marsh, is represented by a complete right hind 

 limb (including the foot), the phalanges of the left foot in place, a pubic bone, and an 

 ischium, of one individual. 



With these, as probably belonging to the same species, are included a posterior 

 dorsal vertebra, caudal vertebrae of remarkable form, phalanges of the mantis and a 

 number of teeth of peculiar shape. 



The femur, tibia, metatarsals and phalanges of the pes, except the terminal ones, 

 are hollow. 



The femur is shorter than the tibia. The astragalus is closely applied to but does 

 not coalesce with the distal end of the tibia ; it has a well developed ascending process 

 apposed to the front face of the tibia. The fibula is slender and the tibia has a prominent 

 cnemial crest. The calcaneum and the tarsal bones were found in place. Metatarsal III, 

 as in Ornithomimus velox,* Marsh, fits closely against metatarsals II and IV, and is, a short 

 distance above its distal end, triangular in section with its flat face foremost. It becomes 

 attenuated above and passes behind the other two metatarsals. Metatarsal V, repre- 

 sented by a short, laterally compressed, slightly curved bone, lies close to the proximal 

 end of metatarsal IV. 



The phalangeal formula is 3, 4, 5 ; digit III is the longest and digits II and IV are 

 of about equal length. The terminal phalanges are sharply pointed in front, rather 

 straight, flattened below and deeply grooved on the sides. The grooves are carried 

 forward to the extreme point and indicate the presence, during life, of a long but not 

 sharply curved or pointed claw. The other phalanges have deep pits, one on each side 

 of their distal extremities. The shape of the terminal phalanges suggests a foot, not 

 suitable for grasping but adapted rather for speed in running, an idea carried out by the 

 slenderness and lightness of all the bones of the leg. 



The posterior dorsal vertebra, plate XIV, fig. 1, is decidedly amphiccelous, the concavity 

 in the anterior face of the centrum being more marked than in the posterior one. The 



'Sixteenth Aunual Report, U. S. Geol. Survey, 1896, plate Iviii., fig. 2. 



