Geological Society of London. 45 



Scarborough certain siliceous sponges which seem to be formed 

 entirely of globates. In outward appearance the sponge is upright, 

 and palmate or fan -shaped, the largest being 140 millim. in height. 

 The wall is 14 millim. thick, and consists of plates wliich anastomose 

 so as to form a labyrinthine structure, and are perforated regularly 

 by oval slits. The laminated walls are composed entirely of small 

 reniform spicules (globates), well seen where secondary crystalliza- 

 tion has not fused them together. The globates, like those of Geodia, 

 are built up of fibres radiating from the centre, and terminating on the 

 outer surface in nodose ends, which causes a spotted appearance. 



The exceptional character of these sponges consists in their having 

 the siliceous skeleton composed entirely of globates. The nearest 

 living form is Placospongia, in which both the axis and the dermal 

 crust are formed of globates with an interspace built up of numerous 

 pin-like spicules. Assuming the absence of pin-like spicules in the 

 Scarborough fossil, the differences are more than generic. The name 

 Benulina, given by Blake to the globates, having been preoccupied, 

 the author proposed that of Bhatella for the genus, and described 

 the sponge from the Lower Calcareous Grit as R. perforata, sp.n. 



II.— Dec. 4, 1889.— W. T. Blanford, LL.D., F.R.S., President, in 

 the Chair. — The following communications were read : — 



1. " On Remains of Small Sauropodous Dinosaurs from the 

 Wealden." By R. Lydekker, Esq., B.A., F.G.S. 



The author first noticed some teeth from the Wealden of Sussex 

 and the Isle of Wight, provisionally referred by Mantell, and sub- 

 sequently by Sir R. Owen, to Hylaosanrus, which he had made the 

 type of a species of Pleurocoelus. He then described the imperfect 

 centrum of a dorsal vertebra from the Wealden of Cuckfield, pre- 

 served in the British Museum, and a somewhat larger imperfect 

 vertebra obtained from the Wealden of Brook, Isle of Wight. 



In the absence of any evidence in favour of a contrary view, he 

 proposed provisionally to refer the vertebra to Pleurocoelus valdensis, 

 a name which he had given to the form represented by the teeth in 

 a paper published in the Gkological Magazine for the current year. 

 He stated that they afforded absolutely conclusive evidence of the 

 occurrence in the English Wealden of a diminutive Sauropodous 

 Dinosaur, which was the contemporary of the huge Hoplosaurus 

 and the still more gigantic Pelorosaurus, and that they also served 

 to increase the evidence as to the similarity of the Dinosaurian fauna 

 of the Upper Jurassic of North America to that of the Upper Jurassic 

 and Lower Cretaceous of Europe. 



2. " On a Peculiar Horn-like Dinosaurian Bone from the Wealden." 

 By R. Lydekker, Esq., B.A., F.G.S. 



Among a series of vertebrate remains sent from the Dorsetshire 

 County Museum to the British Museum, there is an imperfect, stout, 

 short, cone-like bone from the Wealden of Brook, Isle of Wight. 

 It appears to present a close resemblance to the horn-cores of the 

 Dinosaur described by Prof. Marsh as Ceratops. 



The author did not regard the specimen as affording conclusive 



