Geological Society. 227 



GEOLOGICAL SOCIETY. 



[Continued from p. 155.] 



November 19, 1873.— Prof. Kamsay, E.B.S., Vice-President, 

 in the Chair. 



The following communications were read : — 



1. " Supplemental Note on the Anatomy of Hypsilophodon 

 Foxii" By J. W. Hulke, Esq., E.B.S., E.G.S. 



The material for this note was a slab from Cowleaze Chine, con- 

 taining portions of two individuals of Hypsilophodon Foocii — one con- 

 sisting of a skull with a great part of the vertebral column, the 

 other of a portion of the vertebral column. The author described 

 some details of the structure of the skull, and especially the palatal 

 apparatus. The pterygoids, which are not mesially joined, have a 

 stout body, the posterior border of which bears a very large basi- 

 sphenoidal process ; and the left pterygoid retains the root of a strong 

 quadratic process, in front of which the hollow outer border runs out 

 into an ectopterygoid. In front of the pterygoids the palatines are 

 partially visible, also separated by a fissure. Of the eight vertebrae, 

 the last three are firmly anchylosed, and the seventh and eighth 

 form part of the sacrum. They are constricted in the middle ; 

 and their transverse processes, which spring from the junction of 

 two vertebrae, are bent backwards, joining the dilated outer end of 

 the transverse processes of tbe next vertebra, including a large sub- 

 circular loop. The second fragment of a vertebral column, which 

 belonged to a smaller individual, includes the sacrum and several 

 vertebrae. Near the skull the slab contains several very thin bony 

 plates of irregularly polygonal form, regarded by the author as 

 dermal scutes. In connexion with the question of the generic rank 

 of Hypsilophodon, the author stated that in Hypsilophodon the 

 centra of the sacral vertebrae are cylindroid and rounded below, 

 whilst in Iguanodon they are compressed laterally and angulated 

 below. 



2. « The Drift-beds of the North-west of England.— Part 1. Shells 

 of the Lancashire and Cheshire Low-level Clay and Sands." By T. 

 Mellard Reade, Esq., C.E., E.G.S. 



The author commenced by explaining a section in a cutting at 

 Booth-Lane Station, in which most of the beds seen about Liverpool 

 are typically represented. This section shows in ascending order : — 

 1. Pebble-beds of the Trias; 2. shattered rock; 3. compacted 

 red-sand rubble (ground moraine); 4. lowest bed of Boulder-clay 

 (largely composed of red sand); 5. stratified sand, with shell- 

 fragments ; 6. bed of fine unctuous clay ; 7. brick-clay (with many 

 shells) ; 8. sand-bed ; 9. stratified yellow sand (" Washed Drift 

 sand"). 



The author next gave a list of the localities in which shells were 

 found, and stated that in all forty-six species had been met with 

 distributed through the clay-beds, those found in the sand-seams 

 being rare and generally fragmentary and rolled. The shells most 



Q2 



