OSTEOLOGY OF CARNIVOROUS DINOSAURS. 129 



species. This specimen was collected by M. P. Felch from "Quarry No. 1," near 

 Canon City, Colorado, in 1884. They are slightly shorter than those figured by 

 Marsh of this species (see pi. 34, figs. 5 and 6), and it is largely on account of this 

 close agreement in size that they are identified as pertaining to C. agilis, for if 

 Marsh correctly gives their relative dimensions in the type description 1 : "This 

 animal was at least three times the bulk of the type," meaning the genotype C. 

 fragilis. 



The type of this species is in the Yale Museum and bears the No. 2010. In a 

 letter of June 11, 1915, Professor Lull very kindly furnished me the following infor- 

 mation concerning the type specimen: 



C. agilis is one specimen only, consisting of two trays of material only partly prepared. As the' 

 material now is, I recognize the following bones: pubes, femur, tibia, fibula, humerus, radius, ulna, 

 coracoid, an ungual, several podial bones, and several vertebrae. Preparation would doubtless in- 

 crease this list. 



Collected from Quarry 13, Como, Albany County, Wyoming, by W. H. Reed 

 in 1881. At present the distinction of this species from C. fragilis rests on Marsh's 

 statement of its larger size. Since C. fragilis is based on vertebrae alone and there 

 are no vertebrae present in the type of C. agilis I question the authenticity of this 

 species. 



Family ORNITHOMIMIDAE Marsh, 1890. 



Genus ORNITHOMIMUS. 



The genus Ornithomimus was proposed by Prof. O. C. Marsh in 1890 2 where 

 he described 3 the genotype 0. velox, based on material from the Denver formation. 

 In the same article two other species, 0. tenuis and 0. grandis, were briefly described 

 on meager materials. The new family Ornithomimidae was also proposed but 

 without definition. In the same year Zittel 4 gave the first definition of the family 

 as follows : 



Shadel unbekannt. Vorderbeine kurz. Hand dreizehig. Hinterbeine sehr lang. Astragalus 

 mit langern, aufsteigendem Fortsatz. Von den drei funktionirenden metatarsalia ist der mittlere (III) 

 proximal verschmalert und durch die verdickten Gelenkenden der beiden andern ganz nach hinten 

 gedrangt. 



In 1892 5 Professor Marsh briefly described two more species Ornithomimus 

 sedens and 0. minutus. He also correctly concludes that this genus should be 

 referred "not to the Ornithopoda, but to the Theropoda." 



In 1895 6 Marsh included the family Ornithomimidae under the suborder 

 Ceratosauria, and here gave his first definition of the family: 



Pelvic bones coossified with each other and with sacrum; ilium expanded in front of acetabulum. 

 Limb bones very hollow. Four limbs very small; digits with very long, pointed claws. Hind limbs of 

 true avian type. Feet digitigrade and unguiculate. 



1 Amer. Journ. Sci., vol. 27, 1884, p. 335. 



2 Not 1892 as cited in Bull. Amer. Mus. Nat. Hist., vol. 35, p. 738, 1917. 



3 Amer. Journ. Sci., vol. 39, 1890, p. 84, pi. 1, figs. 1-3. 



« Handbuch der Palaeontologie, pt. 1, vol. 3, p. 766, 1890. 

 6 Amer. Journ. Sci., vol. 43, p. 451, 1892. 

 6 Idem, vol. 50, p. 494, 1895. 



