628 SCIENCE PROGRESS 



so-called pseudosuchians, or proterosuchians, as represented by 

 Aetosaurus and its relatives, form the clue to the genealogy of the 

 Archosauria (dinosaurs, crocodiles, and pterodactyles). In the 

 opinion of the author, the saurischian, or sauropod, dinosaurs 

 are the direct descendants of the Pseudosuchia, while one lateral 

 branch from the latter has given rise to the bird-like dinosaurs 

 (Ornithopoda or Ornithischia) and birds, and a second to ptero- 

 dactyles (Ornithosauria). A shorter paper on this subject, by 

 the same author, is published in the Geological Magazine, decade 

 6, vol. i. pp. 444-5- 



As the article on pterodactyle skulls is of a very technical 

 nature, it may be passed over without further mention, and the 

 same must be the case with the one on the saurischian, or, as 

 they are more commonly termed, sauropod dinosaurs. Two 

 other papers on the origin and morphology of dinosaurs, by the 

 same author, have appeared respectively in the Neues Jahrbuch 

 fur Mineralogie and the Zentralblatt fur Mineralogie for 19 14. 



In an article in Naturwissenschaftliche Wochenschrift for 

 July 5, Dr. E. Hennig directs attention to the extraordinary 

 number of dinosaurian remains which have been collected in 

 Germany and her East African colonies during the last five 

 years or so. In Germany the most important of these dis- 

 coveries have been made in the Keuper of Halberstadt and the 

 corresponding formation of Trossingen and Pfaffenhofen, Wurt- 

 temberg, while those from German East Africa occur in the 

 Jurassic and Cretaceous strata of Tendaguru and other districts. 

 The dinosaurian finds from the Swabian Trias formed the sub- 

 ject of a communication made by Dr. E. Fraas at the eighty-fifth 

 Versammlung deutscher Naturforscher und Arzte in September 

 1913; and Dr. O. Jaekel has described the discoveries at Hal- 

 berstadt in vol. i. of the Palaontologische Zeitschrift. According 

 to the first part of the last-named communication, which was 

 published in 191 3, the removal of some 100,000 cubic metres of 

 rock brought to light no fewer than one hundred dinosaurian 

 skeletons. In the second part a new species of turtle of the 

 genus Stegochelys is described as S. dux, and a figure given of 

 the restored skeleton of Plateosaurus. 



In connection with the Tendaguru dinosaurs it may be men- 

 tioned that Mr. C. Schuchert, in the Amer. Journ. Sci. for 191 3 

 (vol. xxxv. pp. 35-8), points out that the largest member of the 

 genus originally described as Gigantosaurus, but now known, on 



