11 



PREFACE. 



collected Sutton Stone Corals, and had discovered the highly fossiliferous deposit at 

 Brocastle, forwarded me his specimens, which are about to be described. The above- 

 mentioned geologists have afforded me all the information at their command ; and 

 Messrs. Kershaw, Winwood, Boyd Dawkins, Burton, Chamberlin, and Mrs. Strickland, 

 have placed me under great obligations. 



Finding that at least fifty new species would have to be added to the list of British 

 Liassic Corals, it was thought advisable to publish the most important at once. 



This Part of the Second Series will refer to the Corals of that portion of the Lower 

 Lias which intervenes between the Rhaetic strata and the beds which contain Ammonites 

 BucHandi {bisulcatus) and Gryphaa iacurva (type) in abundance.-^ 



The next portion of this Monograph (Part IV, No. 2) wUl contain the description of 

 the Corals of the other beds of the Lower Lias, and of the forms in the Middle and 

 Upper Liassic deposits. It is probable that several Liassic beds whose geological horizon is 

 not yet determined may yield new species of Corals which will have to be associated with 

 those of the zone of Ammonites angulatus, and they will, of necessity, be included in 

 Part IV, No. 2, in which the Hsts of the species will be given, w^ith a notice of the 

 Corals of the Liassic strata of Continental Europe. 



Owing to the paucity of specimens, it is thought advisable to defer the consideration 

 of the species from the White Lias of the Rhaetic series and fi'om the Zone of Avicvia 

 contorta to a future occasion. 



1 Madreporaria of the Infra- Lias of South Wales. P. Martin Duncan, ' Quart. Journ. Geol. See.,' 

 Feb., 1867. 



