290 Geological Society. 



animal to which they belonged must have been somewhat larger 

 than Phascolomys mcdius, Owen, but less than the type of the 

 subgenus Phascolomys. The specific name is suggested by the 

 chief characters that distinguish the present form from any 

 hitherto known, recent or extinct. 



2. " On the Structure and Classificatory Position of some Madre- 

 poraria from the Secondary Strata of England and South Wales." 

 By Prof. P. Martin Duncan, M.B., F.E.S., F.G.S. 



This paper consisted chiefly of a criticism of the conclusions 

 arrived at by Mr. R. F. Tomes in various papers communicated to 

 the Society. 



All the species of the genus Astroccenia which were described in 

 the Supplement to the British Fossil Corals, Pal. Soc. 1867, from 

 the Infra-Lias of South Wales, belong td that genus, and not to 

 Stylastraa, de From. The drawing of Astroccenia plana. Dune, 

 given by Mr. Tomes, does not correspond with the type specimen of 

 the species. Stylastrcea sinemuriensis and S. Martini, de From., do 

 not form part of the fauna of the Infra-Lias of South Wales. 

 Gyathoccenia, Dune, is not the same as PhyUocoenia, Laube, which 

 is Koiloccenia, Dune. Thecosmilia Martini and T. Miclielini of the 

 European Hettangian are found in the Infra-Lias of England. 

 T. rugosa, Laube, was first noticed in the Memoir of the Corals 

 of the zone of Ammonites angidatus, Pal. Soc. 1867, and the 

 species was propedy figured. GladopJiylUa is a subgenus of 

 Thecosmilia. Elysast.rm, Laube, has tw o weU-marked species in 

 the Sutton Stone. Montlivaltia simplex has the shape of the calice 

 not merely dependent on pressure, but caused by normal growth. 

 M. Walliw, Dune, has no evidence of " rejuvenescence," and the 

 growth noticed is endothecal, and would be termed by Lindstrijm 

 " stereoplasm." M. polymorpha, Terqrem et Piette, remains a 

 member of the Infra-Lias fauna. M. pedunctdata. Dune, is not a 

 CladophylUa, but a simple coral of the genus to which it was 

 assigned by the author. The geological position of the Sutton 

 Stone and associated deposits is, from the palaeontological evidence, 

 above the Rhaeac series. 



The cast of a Montlivaltia figured by the author in the Memoir 

 on the Corals of the Zo^e of A. anyidatus, Pal. Soc. 1868, p. 68, 

 does not coincide with M. rhwtica, Tomes, but with M. Hahnei. 

 M. foliacea, Tomes, has not nine cycles of septa, as stated by its 

 describer. The septal arrangement of M. excavata, Tomes, and 

 M. papyracea, Tomes, is doubtful. Thamnastrcea is not a perforate 

 coral, but a Fungid. Synastraxc and Centrastrcea were not founded 

 by M. de Fromentel; the former originated with Milne -Edwards, 

 and the latter with d'Orbigny. Centrastra-a is not synonymous 

 with Astra?omorpha. Oroseris is not a perforate coral ; and Milne- 

 Edwards and Jules Haime wore quite correct in stating that the 

 genus " se rapproche beaucoup des Comoseris ; " and it ^s incorrect to 

 state that one genus really bears but a faint resemblance to the 



