624 SCIENTIFIC EECORD FOR 1882. 



YI. CoMPSOGNATHA. (Not characterized.) CompsognatMdce. 



VII. Hallopoda. Dinosaurians witli digitigrade (uuguiculate) feet, 

 the fore (not described), thehiud tridactyle, the " fore limbs very small," 

 and with the metatarsals greatly elongated, the calcareum much pro- 

 duced backwards, the vertebrae biconcave, and the vertebrae as well as 

 limb-bones hollow. Hallopodidce. 



Five orders and fourteen families, it will be hence seen, are admitted 

 by Professor Marsh. 



The fourteen families admitted are distinguishable as follows : 



I (1). Atlantosaurids. Sauropods with ischia directed downwards and 

 meeting at median line at their extremities. 



(2). Morosaurids. Sauropods with ischia directed backwards and 

 meeting along median line by their sides. 



II (1). Stegosaurids. Stegosaurians with astragalus co-ossified with 

 tibia, and very short metatarsals. 



(2). Scelidosaurids. Stegosaurians with astragalus distinct from 

 tibia and elongated metatarsals (with four functional digits in pes). 



III (1). Comptonotids. Ornithoijods without clavicles, and with a com- 

 plete postpubis. 



(2). Iguanodontids. Ornithopods with clavicles, and with an incom- 

 plete postpubis. 



(3). Hadrosaurids. Ornithopods with "teeth in several rows, form- 

 ing, with use, a tessellated grinding surface." (Clavicles and post-pubis 

 not described.) 



IV (1). Megalosaurids. Theropods with biconcave vertebrae, pubes 

 slender and united distally, and tetradactyle pes. 



(2). Zanclodontids. Theropods with biconcave vertebrae, pubes broad, 

 elongate plates, with anterior margins united, and pentadactyle pes. 



(3). AmpMsaurids. Theropods with biconcave vertebrae, pubes rod- 

 like, and tridactyle pes. 



(4). Labrosaurids. Theropods with strongly opisthocoehan and cav- 

 ernous anterior vertebrae. 



V. Goelurids. Dinosaurians with anterior (of cervical) vertebrae opis- 

 thocoelian and rest biconcave ; very long and slender metatarsals, and 

 " bones of skeleton pneumatic or hollow." 



VI. Compsognathids, Dinosaurians with anterior vertebrae opistho- 

 coelian, and others not described, and tridactyle fore as well as hind 

 feet, and ischia with long symphysis on median line. 



VII. Hallopodids. 



The Wings of Pterodactyles. 



Prof. O. G. Marsh has given a large plate and woodcuts illustrating a 

 Pterodactyle, named by him Bhamphorhynchus phyllurus, found in 1873 

 "near Eichstadt, Bavaria, in the same lithographic slates that have 

 yielded Arcliceopteryx, Compsognathus, and so many other Jurassic fossils 

 known to fame." The wing membranes are well preserved and prove 



