2 Professor H. G. 8eeley — Dinosaurs from Rhcetic Beds. 



crown suggests affinity rather with Zanclodon than Megalosaurus. 

 The serrations on the hinder border are at right angles to the margin. 

 I refer this tooth to AvaJonia, the fossil being found in Avalon, the 

 district associated with King Arthur and his Knights of the Round 

 Table. 



Fig. 1. Fig. 2. 



Fig. 1. — Tooth of Avalonia Sanfordi, Seeley. 

 Fig. 2. — Tooth of Picrodon Serveyi, Seeley. 



Ehsetic Beds : "Wedmore (Vale of Glastonbury). 



The second tooth (Fig. 2) is also represented by an imperfect 

 crown. It is from the lower jaw, but of a very different type. It is 

 f inch long and -^ inch wide at the base. It is sharp-pointed and 

 slender, and the only tooth which at all resembles it in form is one 

 from the collection of the late Eev. P. B. Brodie, found near Warwick, 

 now in the British Museum (Natural History), which I refer to the 

 same genus. This acuminate tooth, manifestly smaller than the 

 tooth of Avalonia, and imperfectly preserved, is flattened externally 

 and rather convex on the inner side, where there are 'three or four 

 short slight ribs towards the lower half of the crown, which some- 

 what recall the ribs in the teeth of Snchosaurus, which the type 

 resembles in form ; but the crown differs from that genus in being 

 more pointed, and especially in having the anterior and posterior 

 margins serrated. The anterior serrations are limited to the summit 

 of the crown. Their general direction is at right angles to the 

 curved surface, but they have a perceptibly greater upward tendency. 

 The posterior serrations are also directed upward. This constitutes 

 a distinct resemblance to Thecodontosauriis and a difference from 

 Megalosaurus, in which the serrations are at right angles to the 

 cutting margins of the tooth, as they are in the short crown of 

 PalcBosaurus. The nearest approximation to this kind of serration 

 is made perhaps by the French genus Dimodosaurus. But the 

 serrations, except for their direction, are similar to those of Megalo- 

 saurus, and there is no median ridge running down the length of the 

 tooth such as is figured by M. Gaudry. The tooth indicates the 

 genus Picrodon. I have therefore no doubt that the remains of the 

 skeleton preserved belong to two distinct though closely allied 

 animals, of which the second was the smaller. 



The true nature of the larger animal, Avalonia Sanfordi, is indicated 

 by the remains of the femur and other parts of the hind limb. The 



