18 PEOCEEDIJ^GS OF THE GEOLOGICAL SOCIETY. [NoV; 21, 



it to belong to his Planorbis-zone. The coral is very interesting 

 from its pecnliar calicinal gemmation, and is not allied, except gene- 

 rically, with any known Isastrcea. The Cardinia has a great vertical 

 range ; and had it not been for the accompanying Ostrea arietis, no 

 very definite age could have been assigned to the coral-bed. This 

 Ostrea renders it necessary that the Isastrcea Murchisoni should be 

 included in the zone of Ammonites angulatus, and shows that, like 

 the Madreporaria from Brocastle, it existed before the fauna of the 

 A. BucMandi or GrypJicea-incurva beds. 



Yery lately numerous Madreporaria have been found in Lincoln- 

 shire, at Marton near Gainsborough, in strata between the White 

 Lias and the Gryp7icBa-incu7^va'beds^'. The species are not the same 

 as those of the Brocastle and Sutton series : one of them, Septastrcea 

 Fromenteli, Terquem et Piettef, is found in the zone of Ammonites 

 planorhis of Yolfsmuhl near Mondorf ; and the others are Montli- 

 valtice of the M. HaimeiX type, and rather characteristic of the Lias 

 below the zone of Gryplioia hicurva. The commonest of these 

 Montlivaltim, M. papillata, Duncan, is also found in the Irish beds 

 (Angulatus-zone) with M. Haimei, Chapuis et Dewalque§. 



The Montlivaltice called by M. de Promentel M. tenid-septa and 

 M. granigera \\ are found at Balderton, near Newark^ ; they cannot 

 be considered to be anything more than varieties of M. Haimei^ 

 but they may be regarded as denoting a good coralliferous horizon. 

 At Shepton Mallet, discoid Montlivaltias of the M. Haimei type 

 occur ; but the correct geological horizon of Balderton and the bed at 

 Shepton requires elucidation. 



In the section given by Dr. Wright of the zone of Ammonites 

 planorhis at Street**, the light- coloured marly clay on the top, with 

 Saurian bones and Ammonites planorhis, is succeeded by a light- 

 coloured limestone -with. Ammonites planorhis in moulds; and imme- 

 diately beneath this is a yellow shale with the same Ammonite, 

 Ichthyosaurus intermedius, and a coral. Dr. Wright has sent me the 

 specimen ; and it is not Isastrcea Murchisoni as is stated in his me- 

 moir, but a species he has named Haimei, which does not belong to 

 Isastrcea, but to Septastroea. 



At Binton there are said to be corals in the Guinea-bed, which 

 is covered by a succession of clays and limestones with Modiola 

 minima, Pholiclophorus StricJdandi, Ag., insect-rem.ains, Ammo- 

 nites Johnstoni, and Saurian remains ; unfortunately I have not 

 been able to obtain any specimens. The only Madreporarian of our 

 Ammonites -planorhis zone is therefore Septastrcea Haimei, Wright, 



>> TheEev.T. ChamWlin, F.aB., andF. M.Burton, Esq., F.a.S., have afforded 

 me information on these points, and have sent me the fossils for examination. 



t Le Lias inferieur de Test de la France, p. 129. 



X Mr. R. Tate, F.Gr.S,, informs me that the strata contain the fossils of the 

 Ammonites-angulatus zone. 



§ Mr. Tate has forwarded me specimens. 



II Paleont. Fran^. Uvr. 10. p. Il2, 



*t[ The Eev. Mr. Chamberlin and Eev. P. B. Brodie have forwarded specimens 

 of these forms. 



^^ Wright, Mon. Pal. Soc. vol. for 1863, p. h^o. 



