VERTEBRATE PALAEONTOLOGY IN 1910 681 



horn, as in the American Ceratosaurus, from which genus 

 Megalosaurus is distinguished by the presence of four, in place 

 of three, pairs of teeth in the premaxillae. 



Another paper of special interest to British palaeontologists 

 is one by Dr. von Huene on a primitive dinosaur {Saltopus 

 elgineyisis) from the middle Trias of Elginshire, published in 

 Geol. n. Pal. Ahhand. ser, 2, vol. viii. pt. 6. Although the new 

 genus presents certain resemblances to Thecodontosauriis, it 

 cannot be placed in the same family, and perhaps it will prove 

 to be more nearly related to Ammosaiirns and Tanystrophceus, 

 although referable to another family. The Elgin dinosaur, 

 which had saltatorial habits, appears to have been about a 

 couple of feet in length, with relatively long neck and tail. 



A magnificently preserved skull from the Cretaceous of New 

 Mexico has afforded Mr. Barnum Brown, Bull. Amer. Mus. Nat. 

 Hist., vol. xxviii. pp. 267-74, the opportunity of describing a 

 new genus, Kritosaurus (preferably Critosaurus) of trachodont 

 dinosaurs. 



Passing on to the stegosaurian group, it has first to be 

 mentioned that Dr. von Huene has recorded, in the Neues 

 Jahrbuch f. Min. Geol. u. Pal., 1910, vol. i. pp. 75-8, a femur 

 of Omosanrus (= Dacentrurus) from the Forest Marble of Enslow 

 Bridge, Oxfordshire. 



The nature and arrangement of the bony armour of the 

 American Stegosaurits are discussed by Dr. R. S. Lull in two 

 papers published in the Amer. Journ. Science, vol. xxix. pp. 201- 

 210, and xxx. pp. 161-77 . In the specimen restored by Prof. 

 Marsh a number of ossicles were found adhering to the under- 

 surface of the lower jaw, which, in the opinion of Dr. Lull, 

 formed a gular shield, and also extended over a considerable 

 part of the body, as it is unreasonable to suppose that any 

 portion of the skin of an armoured reptile would be unprotected. 

 The great vertical dorsal plates and caudal spines, the former of 

 which were originally supposed to constitute a single series, 

 appear to have been arranged in a double row. The plates are 

 considered to represent an ultra-development of the longitudinal 

 vertical ridge on the horizontal scute of a crocodile or an 

 unspecialised dinosaur like Ancylosaiirus. Throughout the 

 back the ribs are T-shaped in section in order to bear the 

 weight of the plates. In the neck the latter are borne on short 

 and notched transverse processes, but in the back the processes 



