Geological Society of London. 573 



Dr. Duncan remarked that the same combination of forms separated in Europe was 

 found anionsj the Tertiary fossils of Australia. He thought that further facts were 

 necessary before forming a decided opinion as to the succession of the beds in that 

 continent. 



The President remarked that when we talked of identity of fauna in Australia and 

 this'country, impi-obable as it might appear, we must remember that at the present 

 time identical species and, to a great extent, a similar fauna, were to be found in our 

 seas more than 180° apart. 



Mr. Moore, in reply, argued that it was the safest plan to follow the well-established 

 standard of Europe even in remote parts of the world. He was inclined to refer the 

 bulk of the specimens rather to the Lower than to the Middle Oolite, but otherwise 

 he agreed in the main with Mr. Tate. 



3. " On Hypsilopliodon, a new Grenus of Dlnosauria.'^ By Pro- 

 fessor Huxley, F.R.S., President. 



The author described the characters presented by the skull of a 

 small Dinosaurian reptile obtained by the Rev. W. Fox from a 

 Wealden bed at Cowleaze Chine, in the Isle of Wight. One of the 

 most striking peculiarities of this skull was presented by the prge- 

 maxillary bone, which seems to have been produced downwards 

 and forwards into a short edentulous beak-like process, the outer 

 surface of which, is rugose and pitted. The author remarked upon 

 the known form of the symphysial portion of the lower jaw in the 

 Dinosauria, and indicated that its peculiar emargination was pro- 

 bably destined to receive this beak-like process of the prgemaxillaries, 

 which may have been covered either by fleshy lips or by a horny 

 beak. The dentigerous portion of tbe prsemaxilla bears five small 

 conical teeth. The alveolar margin of the maxilla bears ten teeth, 

 which are imbedded by single fangs, and apparently lodged in distinct 

 alveoli. The summit of the crown, when unworn, is sharp and pre- 

 sents no trace of the serrations characteristic of Iguanodon ; but it is 

 sinuated by the terminations of the strong ridges of enamel which, 

 traverse the outer surface of the crown. The teeth thus present 

 some resemblance to those of Iguanodon ; but the author regarded the 

 two forms as perfectly distinct, and named the species under con- 

 sideration Hijpsilopliodon Foxii. Of the lower jaw the right ramus 

 is present ; but its distal extremity is broken off, and its teeth are 

 concealed. On the outer surface of the lower jaw the centrum of a 

 vertebra is preserved. 



The author then referred to a fossil skeleton in the British Mu- 

 seum, which has been regarded as that of a young Iguanodon ; it 

 is from the same bed as the skull previously described. The author 

 remarked that, in form and proportions, the vertebra3 were quite 

 different from those of Iguanodon, and apparently identical with 

 those of his new genus, as shown by the centrum preserved with the 

 skull : the animal had at least four well-developed toes ; and other 

 peculiarities were indicated, which seem to prove that it was quite 

 distinct from Iguanodon. This sk.4eton the ai;thor identified with 

 his Hi/psilophodon Foxii, and described its characters in detail, 

 dwelling especially upon the peculiarities of the pelvic bones, which 

 are singularly avian in their structure. 



4. " Further Evidence of the Affinity between the Dinosaurian 

 Eeptiles and Bu-ds." By Professor Huxley, F.R.S., President. 



