Geological Society. 121 



the remains of Iguanodonts from the Wadhurst Clay near Hastings 

 collected by Mr. C. Dawson. They were considered to indicate two 

 species, for which the names Iguanodon hollingtoniensis and /. Fittoni 

 had been proposed in a preliminary notice. 



In the second section air imperfect metatarsus of a species of 

 Megalosaurus from the Hastings Wealden was described, and 

 shown to indicate a species quite distinct from the one to which a 

 metatarsus from the Wealden of Cuckfield belonged. Two cervical 

 vertebrae of a Sauropterygian from the Purbeck of the Isle of Port- 

 land were next described, and referred to Cimoliosaurus portlandicus, 

 Owen, sp. 



The concluding section described an imperfect skeleton of a large 

 Pliosaur from the Oxford Clay, in the collection of Mr. A. N. Leeds, 

 which indicated a species intermediate between the typical Kime- 

 ridgian forms and the genus Pdcmenstes. These specimens were 

 considered as probably referable to Pliosaurus ferox. Evidence was 

 adduced to show that Pliosaurus Evansi, Seeley, should be transferred 

 to Peloneusti's. 



2. " On some Pakeozoic Ostracoda from North America, "Wales, 

 and Ireland." By Prof. T. Rupert Jones, F.R.S., F.G.S. 



The chief materials referred to were : — 



1. Some good specimens of North-American Ostracoda from the 

 Lower Helderberg and Cincinnati Groups in the British Museum 

 and the Author's collection ; these have given occasion for a critical 

 revision and careful illustration of several forms. 



2. In the ' Pakeontology of New York,' vol. iii. 1859, several of 

 the Palaeozoic Ostracoda of New York State were described but not 

 figured. Copies of some of the original drawings have been cour- 

 teously supplied, with Dr. James Hall's permission, by Mr. J. M. 

 Clarke, of Albany. They enlarge our knowledge of the Lower 

 Helderberg fauna. 



3. A large collection of Pakeozoic Ostracoda, collected in the Lake 

 Champlain district and elsewhere, sent by Prof. R. P. Whitfield, of 

 New York, for examination by the Author. 



4. Other specimens belonging to the Utica Slate Series from 

 Ontario, presented to the Author by Dr. John Young. 



5. An interesting series of Lower-Silurian (Ordovician) species 

 from near Welshpool, comprising a characteristic Cincinnati species, 

 sent by Mr. J. Bickerton Morgan. 



6. A rare Palaeozoic Cytheroid Ostracod from Kildare, collected 

 by Mr. Joseph Wright, FJi.S. 



The specimens were described as nearly as possible in the 

 order of their natural relationship, and thus, besides adding to the 

 known forms, they were shown to illustrate the modifications ex- 

 hibited by the genera and species of these minute bivalved Crus- 

 taceans, both in limited districts and in different regions. 



Ann. & Mag. N. Hist. Ser. 6. Vol. v. 9 



