20 — 



Breite (axiale Richtung des Tieres) des 1. Schildes 3,8 cm 



„ des 2. und 3. Schildes 1,8 „ 



„ des 4. bis 18. Schildes ca. 2,2 „ 



Länge (transversal) eines medianen Schildes am Hinterrande: 1 = 45 mm; 11 = 50; 

 111 = 53; IV = 63; V = 65; VI = 72; VII = 75; VIII = 80; IX = 80; X = 83; 

 XI = 83; XII = 83; XIII = 74; XIV = 72; XV = 72; XVI = 68; XVII = 66. 



Lateral schneiden die Median- 

 schilder schräg ab, und zwar so daß 

 der vordere Transversalrand der 

 längere ist. Die vorhandenen 

 Seitenschilder haben gleiche Breite 

 wie die Dorsalschikler und sind 

 ebenfalls in gleicher Richtung in 

 die Länge gezogen. Bei Aetosaurus 

 sind die Seitenschilder fast qua- 

 dratisch. 



Fig. 49. Stegomus arcuatus Marsh, 

 im Peabody Museum der Yale Universität. 

 Abdruck des Rückenpanzers. '/ 6 nat. Gr. 

 Die vordersten Schilder sind auf der Figur 

 links. 



Fig. 49. 



Die Benennung der Pseudosuchia. 



Zittel hat diese Gruppe am klarsten umschrieben. Er nennt sie im Handbuch 1887—1890 

 Pseudosuchia. Einige Forscher, wie Boulenger und Watson, wollen neuerdings die OwENsche Be- 

 zeichnung Thecodontia auf diese Gruppe anwenden. Owen definierte sie (On the Orders of fossil and 

 recent Reptilia and their distribution in time. Rep. 29th meeting Brit. Assoc. Adv. of Science. Aberdeen 

 1859 [1860]. pag. 153—160) folgendermaßen (1. c. pag. 163): „Order VII. Thecodontia. The vertebral 

 bodies are biconcave ; the ribs of the trunk are long and bent, the anterior ones with a bifurcate head ; 

 the sacrum consists of three vertebrae ; the limbs are ambulatory, and the femur has a third trochanter. 

 The teeth have the crown more or less compressed, pointed, with trenchant and finely serrated margins ; 

 implanted in distinct sockets. Teeth of this type which may have belonged to the loricated saurian 

 Stagonohpis, have been discovered by Mr. P. Duff iu the white sandstone at Lossiemouth near Elgin, 

 afforded additional evidence of its triassic age. The Protorosaurns of the Permian Kupferschiefer of 

 Thuringia appears to have had its teeth implanted in distinct sockets ; but the neck-vertebrae resemble 

 in their large and strong proportions those of the Pterodactyles; and the caudal vertebrae show the 

 peculiarity, among Reptiles, of bifurcate neural spines. The types of the present order are the extinct 

 genera Thecodontosaurns and Palaeosaiirus of Riley and Stutchbury, from probably triassic strata near 

 Bristol; and the Cladyodon of the new red sandstone of Warwickshire, with which, probably, the 

 Belodon of the Keuper sandstone of Wirtemberg (sie) is generically synonymous. The Batkygtiatlnis, 

 Leidy, from new red sandstone of Prince Edward's Island, North America, is probably a member of 

 the present Order, which seems to have been the forerunner of the next." (Dinosauria: Iguanodon, 

 Hylaeosanrus, Megalosaurus, Scelidosaurus.) Die 3 Gattungen, die in erster Linie als Repräsentanten 



20 



