MESOZOIC TIME — TRIASSIC AND JURASSIC. 



767 



Testuclinates. — Glyptops ornatus Marsh (1890) was a Turtle with an 

 elaborately sculptured skull, from the freshwater Atlantosaurus beds of 

 "Wyoming. The form of the skull is shown in Fig. 1223. The carapace 

 represented in Fig. 1224 was found in the same beds, and is probably of 

 the same, or an allied, species. 



A tortoise over a foot in diameter has been described by Cope (1878), 

 under the name Compsemys pUcatidus, from the Upper Jurassic beds of Como, 

 Wyoming. The bony case or carapace is as complete, according to Cope, as 

 in a modern tortoise, being without any embryonic or transitional characters. 



Pterosaurs, or flying Eeptiles (Figs. 1321 to 1325, pages 786, 787) , are known 

 from a few bones from Wyoming. The character of the wing in the Ptero- 

 saurs is shown in Fig. 1321. The type specimen of Pterodactylus montanus 

 Marsh is the distal portion of the metacarpal bone. The size indicates a 

 spread of w4ng of four or five feet. 



3. Birds. — A portion of a skull of a bird rather larger than a Blue 

 Heron {Ardea herodias), from the Atlantosaurus beds of Wyoming, is the 



1225 



1226 



1225-1249. 



1228 1229 



1230 



1238 



1239 



1240 



1241 



Mammals. — Fig. 122.o, AUodon laticeps, upper jaw, view from below; 1226, A. fortis, right premaxillary, outer 

 view ; 1227, id., inner view ; 1228, id., lower incisor ; 1229, id., left upper jaw ; 1280, Ctenacodon serratus, 

 right lower jaw ; 12-31, id., left lower jaw; 12.32, C. potens, left lower jaw ; 1233, front view, showing the two 

 long incisors together ; 1234, id., right upper jaw ; 1235, Stylacodon gracilis, left lower jaw ; 1236, Dryolestes 

 priscus, left lower jaw ; 1237, D. vorax, left lower jaw ; 1238, Laodon venustus, left, inner view ; 1239, Asthe- 

 nodon segnis, right, outer view ; 1240, id., anterior part left lower jaw ; 1241, Tinodon bellus, right, inner 

 view ; 1242, Diplocynodon victor, outer view ; 1243, Docodon striatus, inner ; 1244, Menacodon rarus, outer 

 view; 1245, id., inner ; 1246, Enneodon crassus, enter view ; 1247, Priacodon ferox, inner view; 1248,1249, 

 Paurodon valens, left lower jaw. All natural size except 1225, 1230, 1238, which are f ; and 1242, 1243, |, 

 From Marsh. 



