<>. ( Marsh — New Dtnosaurian Reptiles, 85 



The third metatarsal, usually the largest and the mosl 



robust throughout, here diminishes in size upward, and takes 



a subordinate, posterior position, as in birds. The correspond- 

 ence between the metatarsals of the bird and reptile are here 

 strongly marked as in the tibiffi and their accompanying 

 nents, above described. 

 In figure <">. the three phalanges represented belong with the 



>nd metatarsal, and were found together in place. 

 The three metacarpals represented in figure 4 were found 

 together in position, near the remains of the hind limb here 

 described. Their very small size indicates that they may pos- 

 sibly belong to a smaller individual, but, with this exception, 

 there is no reason why they do not pertain to the same speci- 

 men as the hind foot. 



The remains of the ' present species here described were 

 found in the Ceratops beds of Colorado. 



Two other species, apparently of the same genus, are 

 represented by various specimens from the same horizon, in 

 Montana. One of these, which may be called Omithomirmis 

 tenuis, was about twice the bulk of the present form. The 

 third metatarsal was much more compressed transversely, both 

 in the shaft and distal end. The bone was also much more 

 slender medially than in the above species. The transverse 

 diameter of this metatarsal at its distal end was 30 mm ., and the 

 antero-posterior diameter, 35 im ". 



.V third species, much larger, may be called Omithomimiis 

 grandis. The third metatarsal was about 600 mm . in length, 

 and its distal end 90 mm . in transverse diameter, and 80 mm . in 

 antero-posterior diameter. 



These various remains represent a distinct family, which may 

 be called the Ornithomimidce. 



Barosaurus le?itus, gen. et sp. nov. 



A new genus of the Sauropoda is indicated by various 

 remains of a very large reptile secured by the writer during 

 the past season. The most characteristic portions examined 

 are the caudal vertebrae, which in general form resemble those 

 of Di/plodocus. They are concave below, as in the caudals of 

 that genus, but the sides of the centra are also deeply excavated. 



In the anterior caudals, this excavation extends nearly or 

 quite through the centra, a thin septum usually remaining. 

 In the median caudals, a deep cavity on each side exists, as 

 shown in figures 1 and 2, on page 86. 



