ORDER VIII 



DINOSAURIA 



231 



against anterior face of tibia ; distal tarsals represented by three small 

 flattened bones. C. longipes, AVagner. 



Hallopus, Marsh. A small form apparently 

 related to the preceding. Fore -limb relatively 

 short and with four digits. Astragalus without p 



^r-ttS 



Compsognatlius longipes, Wagner. Lithographic Stone ; Kelheim, 

 Bavaria. Skeleton, 1/4 (after A. Wagner). 



Fig. 33.3. 



Compsognathus longipes, 

 Wagner. Left hind foot, i/i- 

 F, Fibula ; mt. Metatarsals ; T, 

 Tibia ; t2-t5, Distal tarsals 

 (after Baur). 



ascending process ; calcaneum produced into a " heel," suggestive of the 

 power of leaping. Upper Jura ; Colorado. 



Family 3. Ooeluridae. Marsh. 



Skull unknown ; vertebrae and all other hones of the skeleton hollow. Cervical 

 ribs fused with their centra. Neural canal greatly enlarged. Metatarsals very long 

 and slender. Upper Jura and AVealden. 



Coelurus, Marsh (Aristosuchiis, Seeley). Known only by portions of the ver- 

 tebral column, pelvis, and limb bones. Centra, neural arches, and all processes 

 of the vertebrae have hollow interiors, and the neural arches are suturally 

 united with their centra. In the cervical and trunk regions the neural canal is 

 greatly dilated. Upper Jura ; Wyoming and Maryland. Wealden ; England. 



Thecospondylus, Seeley ; Ccda7nosj)ondylus, Lydekker. Wealden ; England. 

 Tichosteus, Cope. Upper Jura ; Colorado. All these names apply to detached 

 vertebrae. According to Cope, the peculiar vertebrae described by von Meyer 

 from the Muschelkalk of Bayreuth under the name of Tanystropheus, and 

 occurring also in the Trias of New Mexico, belong to this family. 



Sub-Order 2. SAUROPODA. Marsh. {Cetiosauria.)^ 



More or less massive, herbivorous, quadrupedal Dinosaurs. Skull relatively small, 

 antorbital vacuity large. Brain-case completely ossified ; no predentary hone. Teeth 



^ Literature : 



Hatcher, .J. B., Diplodocus, Mar.sh (Mem. Carnegie Museum, vol. L), 1901. — Marsh, 0. C, The 

 Dinosaurs of North America (16th Ann. Eep. U.S. Geol. Surv.), 1896. — Oshorn, H. F., Additional 

 characters of the great herbivorous Dinosaur, Camarasaurus (Bull. Amer. Mus. Nat. Hist. vol. X. 

 p. 219), 1898.— A Skeleton of Diplodocus (Mem. Amer. Mus. Nat. Hist. vol. I. pt. V.), 1899.— 

 Phillips, J., Geology of Oxford and the Valley of the Thames. Oxford, 1871. 



