A. J. Jukes-Broivne — Boring at Marston, Devizes. 445 



shown bj' the Avriter iu the Stegosauria, the 'J'racliodontidae, and tlie 

 Ceratopsia). All of these features in the skull are differences from 

 the Sanrischia and at the same time show the higher adaptation and 

 specialization of the Ornithischia. So long ago as 1908 the writer 

 stated that no Ornithischia are known in the same primitive stage as 

 certain of the oldest Sauriscliia. 



In the vertebral column Saurischia of the highest specialization do 

 not possess ossified tendons as do all bipedal Ornithischia, even the 

 relatively primitive Hypsilophodon. This must be due to a different 

 manner of locomotion and of feeding ; the different kind of motion 

 must have the same reason as the transformation of the pelvis and its 

 stronger fixation to the vertebral column. Moreover, abdominal ribs 

 are not yet known in Ornithiscliia, but they occur iu Saurischia even 

 in some of their latest forms. 



In a recent paper' the writer has tried to demonstrate that the 

 Saurischia and the Ornithischia came from the Pseudosuchia,^ the 

 former from their most primitive representatives by minor specializa- 

 tions, the latter from more specialized Pseudosuchians by a stage of 

 bipedal hopping creatures in which the pelvis became adapted to this 

 new locomotion by retroversion of the pubis and development of 

 a prepubis. From this stage, as the writer suggests, the birds 

 were also adapted for climbing on trees, then becoming capable of 

 a parachute-flight, iu consequence of this acquiring feathers and then 

 later learning true flight (Abel's ideas combined with the writer's). 



The name ' Dinosauria ' should be absolutely abandoned, as is the 

 case, for instance, with that of ' Enaliosauria'. 



In 1908 the writer showed that the Sauropoda must have developed 

 from the Plateosauridse, an opinion he still retains, although some 

 minor changes in our knowledge of the Saurischia have taken place. 

 The writer now proposes two great sub-orders within the Saurischia: 

 Coelurosauria and Pachypodosauria (see Centralhl. f. Min., etc., 1914, 

 pp. 154-8), the former with four families : Hallopoda, Podokesauridae 

 {Podohesaurus, Procompsogn(ith.us,Saltoptis, Ccelophijsis, Tanystrophaius)^ 

 Compsognathidse, Coeluria (iucl. Ornithomivius) ; the second sub-order 

 would comprise again two lines of development, one leading fronr 

 Thecodontosaurus to the Plateosauridse and Sauropoda, the other from 

 Palceosaicriis to the Megalosauridse. 



IV. — On a Boeing at Marston near Devizes. 

 By A. J. JuivES-Browne, F.R.S., F.G.S. (deceased). 

 rilHIS boring, though confined to the Kimeridge Clay, is of some 

 1 interest, "partly because it has proved the thickness of that clay 

 to be much greater than it was supposed to be in this ])art of 

 Wiltshire, and partly because it has yielded a species of Aporrhais or 

 Harpagodes which has not previously been found in England. 



' " Beitriige zur Geschicbte der Archosaurier " : Geol. u. Pal., Abh. 1914. 



- Dr. G. A. Boulenger and Mr. D. M. S. Watson propose to reintroduce 

 Owen's term ' Thecodontia ', but the types on which he erected this order 

 are : Stngonolepis, Belodon, Cladyodon, Thecodontosaurus, Pahcosatirus, and 

 Bathygnathiis. They belong to very different orders. 



