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guru, German East Africa, have been worked with great 

 energy and a vast number of gigantic bones transported to 

 Berlin. An account of the excavations and descriptions of 

 some of the bones, by Mr. Janensch and others, will be found in 

 Sitzber. Ges. natfor. Freunde for 191 2. According to this, the 

 biggest of the Tendaguru dinosaurs is remarkable for the huge 

 dimensions of the scapula and humerus, which are propor- 

 tionately much larger than in other species and actually bigger 

 than any other known specimens. The biggest humerus 

 measures rather more than 6 ft. 6 in. in length. Of this 

 enormous bone a cast has been acquired by the Natural 

 History Museum. The dinosaur to which this great bone 

 belonged is believed to be near akin to Diplodocus but with 

 a relatively as well as actually larger scapula and fore-limb. 

 Another paper, by Dr. E. Hennig, on the possible occurrence 

 of the Tendaguru deposits in other districts appears in the 

 same journal (pp. 493-7). 



To the Memoirs of the American Museum of Natural 

 History, ser. 2, vol. i. pt. 1, Prof. H. F. Osborn contributes 

 an illustrated account of the skull of the gigantic theropod 

 dinosaur Tyrannosaurus rex, from the Upper Cretaceous of 

 Montana, together with notes on the skulls of Allosaurus and 

 the Theropoda in general. The skull of Tyrannosaurus, 

 which is furnished with a formidable armature of teeth of 

 the megalosaurian type, is not only the largest in the theropod 

 order, but also the most powerful and massive among reptiles 

 as a whole ; as may be verified by the inspection of a cast 

 exhibited in the Natural History Museum. A noteworthy 

 feature of the skull is the fusion of the vomers into a single 

 diamond-shaped plate, articulating posteriorly by a long style 

 with the pterygoids, since a practically identical structure 

 exists in the ostrich and its relatives. As an adaptive modifi- 

 cation correlated with the powerful dentition, attention is 

 specially directed to the antero-posterior shortening of the 

 skull and the reduction of the number of pairs of teeth from 

 twenty (in Allosaurus) to sixteen. This abbreviation of the 

 skull is paralleled among modern cats and certain extinct dog- 

 like carnivores. The homology of certain bones of the thero- 

 pod skull is also discussed. A second article in the same 

 issue is devoted to the description, by Prof. Osborn, of the 

 " mummified " skin of Trachodon annectans, an iguanodont 



