PALEONTOLOGY 21? 



Another mammal paper which must be carefully read is 

 that of Prof. Schlosser {Beit. z. Kennt. der Saitgethiere-reste 

 aits den untersten Eocaen von Rehns, Stuttgart, 1920), since 

 it makes a notable addition to our knowledge of the Cernasien 

 fauna. 



Prof. G. V. Arthaber's paper {Ober Entwickl., Ausbilding, 

 & Absterben der Flugsaurier, 1921) is chiefly remarkable for 

 the number of grotesque figures, masquerading as " restora- 

 tions " of Archceopteryx and the pro-aves which adorn its 

 pages. 



Our knowledge of the Hadrosauridae (Trachodontidae) has 

 been materially enlarged by the investigations of Dr. Laurance 

 Lambe. He makes a further, and most welcome, addition to 

 this theme, in his able Memoir on the Hadrosaur Edmonto- 

 satirns from the Upper Cretaceous of Alberta {Canada Geological 

 Survey Memoir, 120). The genus Edmontosaiirus , new to 

 science, is founded on two skeletons, one of which was found 

 in a naturally disarticulated condition, embedded in a clayey 

 sandstone so easily removed that the bones could be cleaned 

 with the greatest ease, thus enabling the elements of the skull 

 to be studied with a completeness till now impossible. The 

 importance of this will be appreciated in full measure not only 

 by those who are engaged in the study of these huge reptiles — 

 a study rendered more difficult by the wealth of forms which 

 have been brought to light during recent years — but also by 

 those who are concerned with the morphology of the vertebrate 

 skull in general. The author concludes his Memoir with a 

 revision of the classification of the Hadrosauridae, adding 

 a third sub-family — Stephanosauridce — to the two already 

 recognised. A number of extremely well-drawn figures add 

 greatly to the value of his work. 



A welcome complement to this Memoir is that of Dr. C. W. 

 Gilmore on the Osteology of the Carnivorous Dinosauria 

 {Smithsonian Institute Bulletin, 110, 1920). This has special re- 

 ference to the geneva. A ntrodemus, Allosaurus, and Ceratosaurus. 



In a paper on the Structure of the Reptilian Tarsus {P.Z.S., 

 1 921) Dr. R. Broom points out that the most remarkable 

 features of the Amphibian and Reptilian tarsus are the almost 

 constant presence of the fibulare and intermedium, and the 

 great variability of the tibiale. The last named is rarely a 

 large element, and frequently entirely or partly cartilaginous. 

 In many types it is completely absent. 



Palaeichthyologists will welcome the Memoir on Triassic 

 Fishes from Spitzbergen, 1920, by Dr. Erik Stensio, not merely 

 because of the relative inaccessibility of that island, but also 

 because he has done his work very thoroughly, drawing some 

 valuable comparisons between these and modern Ganoids and 



