138 Reports and Proceedings — 



ix. The Buhble on the Sides and in the Bed of the Valley. — The 

 author describes this rubble, and rejects the view that it is rain- 

 wash or due to subaerial action, and discusses the possibility of its 

 having been produced by ice-action. 



X. Alluvium and Neolithic Implements. — These occur chiefly between 

 Shoreham and River head. 



xi. On the Chalk Escarpment within the Darent District. — The 

 author, after discussing and dismissing the view that the escarpment 

 was formed by marine denudation, criticizes the theory that it was 

 due to ordinary subaerial denudation, and lays stress on the irregular 

 distribution and diversity of the drift-beds in the Darent area ; these 

 do not possess the characters which we should expect if they were 

 formed by the material left during the recession of the Chalk escaip- 

 ment owing to subaerial action ; and he believes that glacial agency 

 was the great motor in developing the valleys and, as a consequence, 

 the escarpment, and that the denudation was afterwards further 

 carried on in the same lines by strong river-action and weathering, 

 though supplemented at times by renewed ice-action. By such 

 agencies, aided by the influence of rainfall and the issue of powerful 

 springs, he considers that the escarpment was gradually pared back 

 and brought into its pi'esent prominent relief. 



2. " On Agrosaurus Macgillivrayi (Seeley), a Saurischian Reptile 

 from the N.E. coast of Australia." By Professor H. G. Seeley, 



F.R.S., F.as. 



The complete left tibia, a less perfect proximal end of the cor- 

 responding right tibia, a fragment regarded by the author as a fibula 

 attached to matrix which contains two laterally compressed claw- 

 phalanges, are preserved in the British Museum, and are labelled 

 " Fly," 1844, J. Macgillivray, from the N.E. coast of Australia, 

 These remains are described, and the distinctive characters which 

 determine the fossil (the distal end of the tibia) noted. It shows an 

 ordinal resemblance with Poelcilopleuron and Cetiosaurus, but with 

 Dimodosaurus from the top of the Keuper it is so close that the two 

 must be regarded as nearly allied. The fossil is regarded as 

 generically distinct from all known types. The remains indicate an 

 animal about the size of a sheep, and it is considered as not improb- 

 able that the creature belongs to the Lower Oolites or Trias. 



3. " On Saurodesmus Robertsoni, a Crocodilian Reptile from the 

 EhjBtic of Linksfield, in Elgin." By Professor H. G. Seeley, 

 F.R.S., F.G.S. 



The bone described in this paper was found in a mass which has 

 been interpreted as a large boulder of Rhsetic beds in Boulder-clay. 

 The specimen has already been noticed by Sir Richard Owen and 

 R. Lydekker, Esq. The author maintains that the bone is a right 

 humerus. He discusses its asserted Chelonian affinities, and concludes 

 that it is not Chelonian but Crocodilian, but that, if grouped with 

 the Crocodilia, it belongs to a suborder hitherto unknown, and 

 defined by a combination of Crocodilian and Lacertilian characters 

 which is not Saurischian. 



