304 A. J. JUKES-BROWNE ON THE RELATIONS OF 



appearance presented by the coral in the state of a cast without 

 corallum and epitheca. The Cambridge specimens, being* casts of the 

 calyx, are sometimes nearly flat below, while in perfect specimens 

 of T. Harveyanus the corallum forms a'somewhat conical base. 



When, however, I found that precisely similar casts existed in 

 the Folkestone Gault, and that Mr. Price had always considered 

 them to belong to T. Harveyanus, I had no hesitation in referring 

 them to the same species, in which step Mr. Etheridge also fully 

 concurs. 



At Folkestone Mr. Price has not yet found it above the Lower 

 Gault, though it is abundant in the top beds, Nos. VI. and VII., 

 which also contain many of the other Lower-Gault forms occurring 

 at Cambridge. 



Another species, Smilotrochus (? Trochocyathus) angulatus, Duncan, 

 is very common in the nodule-bed, but is only found in the very 

 lowest bed at Folkestone • in Cambridgeshire therefore it must have 

 had a much higher range ; and it occurs in the nodule-bed of Bucks. 



The following list of Cambridge fossils is compiled almost entirely 

 from the collection in the Woodwardian Museum, and may in fact 

 be taken as a catalogue of that collection. The lists of Heptilia are 

 simply taken, with but little alteration, from Mr. Seeley's ' Index to 

 the Woodwardian Collection;' but the Mollusca have been subjected 

 to a thorough revision. 



As regards the tables of range, the first two columns, showing the 

 horizon of Gault fossils, are filled up chiefly from those appended to 

 Mr. Price's paper on the Gault of Folkestone (Quart. Journ. Geol. 

 Soc. vol. xxx.), supplemented by my own observations and further 

 identifications of species among Mr. Price's valuable collection. 



For the table of " Gault- superieur " or Vraconnian fossils, I have 

 consulted MM. Pictet and Campiche's Monograph on the Environs 

 de Ste.-Croix ; " La Faune de Cheville," by Prof. Eenevier (Soc. Vau- 

 doise des Sc. Nat. ix. pp. 105 & 389) ; and " Les Environs de la 

 Perte du Rhone " (Soc. Helv. des Sc. Nat. 1855, vol. xiv.), by Prof. 

 Eenevier. 



For the Greensands my authorities are Phillips's ' Geology of 

 Oxford,' the Memoirs of the Geological Survey, and the collections 

 in the Woodwardian Museum. The last column is filled in from the 

 fossils in the Woodwardian Museum and in Mr. Price's collection, 

 and from the Survey Memoirs, Bristow's ' Isle of Wight,' &c. 



