230 Oeological Society. 



May 12, 1886.— Prof. J. W. Judd, F.R.S., 

 President, in the Chair. 



The following communications were read : — 



1. " On the Maxilla of Ignanodon." By J. W. Hulke, Esq., 

 F.E.S., F.G.S. 



Two fragments, together representing nearly the entire left 

 maxilla of a species of Iguanodon, have been found at Cuckfield, the 

 locality whence the first tooth of the genus was obtained by Dr. 

 Mantell, about 1820. These fragments, measuring together 29 centi- 

 metres, and exhibiting 19 alveoli in the dentary border, were de- 

 scribed in the paper. It was shown that the upper jaw in question 

 probably belonged to Iguanodon Mantelli. In addition to the de- 

 tailed characters described, the maxillte of Iguanodon and Hypsi- 

 lophodon were compared, and their distinctions explained. 



2. " Notes on the Distribution of the Ostracoda of the Carboni- 

 ferous Formations of the British Isles." By Prof. T. Rupert Jones, 

 F.R.S., F.G.S., and J. W. Kirkby, Esq. 



Although all the Ostracoda of the Carboniferous Formations are 

 not yet described, there are 170 species and notable varieties known, 

 belonging to 33 genera of 9 families. About 25 of these species, 

 not yet described, but determined by the Authors, are introduced 

 into their lists as giving a fuller idea of the value of this manifold 

 Crustacean group. 



In the first place they referred to the classification of the Carboni- 

 ferous strata in Scotland and in England, according to the local dif- 

 ferences, taking in succession " Scotland West," " Scotland East," 

 " England North, with the Isle of Man," " England Central and 

 South, with South Wales," as the several districts from which they 

 have obtained good groups of Ostracoda from different members of 

 the Carboniferous series. 



In Fife, the lowest local Carboniferous strata contain Begrichia 

 subarcuata; higher up come in Carbonia fabulina, C. Ranlciniana, 

 Bairdia nitida, and Leperditia OJceni ; the last, accompanied by other 

 species, occurs throughout this lowest series, in which the record is 

 more complete than in Midlothian and Linlithgowshire, where 

 the same species also occur. In Dumfriesshire and Ayrshire Leper- 

 ditia Okeni and L. suhrecta have been found in beds even lower than 

 those above mentioned, and are therefore probably the oldest Carbo- 

 niferous Ostracoda ; other species accompany them higher up, and 

 in Eoxburghshire some localities of the Calciferous-Sandstone series 

 are very rich in species. The Carboniferous-Limestone series of 

 S.W. Scotland has been highly productive of Ostracoda, particularly 

 the shales of the lower beds ; 36 species are common or charac- 

 teristic. The middle or coal-bearing portion has yielded but few, 

 chiefly Leperditia Yoimgiana, one BegricMa, Carbonia fabidina, and 

 O. Ranlciniana. The tipper-Limestone group contains many recur- 

 rents from below and a few others, including Youngia rectidorsalis. 



