C0EALS OF THE LIAS OP ENGLAND AND S. WALES. 193 



depression. The septa are in six systems ; and there are four cycles. 

 They are thick, and their margins are fringed with tubercles. The 

 centre of the calice is filled with a crowded mass of tubercles. 



Diameter of the calice T 3 g of an inch, height J of an inch. 



In weathered examples, in which the whole of the calice has been 

 worn down, the central tubercular mass is still visible ; but I have 

 failed to distinguish the presence of the pali. The septa appear to 

 lose themselves in the central mass, somewhat as they do in the 

 genus Oyathophyllia. 



I have seen about twenty specimens of these small corals re- 

 ferable to this species, all of which have been found in the lower 

 part of the Upper Lias associated with Ammonites Hollandrei. 



The excavation at Adderbury, from which several of these speci- 

 mens have been taken, was made for the purpose of raising iron-ore 

 from the marlstone of the Middle Lias, which is here overlain by a 

 few layers of Upper Lias, in which the corals occur. Ammonites 

 Hollandrei, with which they are associated, takes the place, in this 

 district (as I learn from Mr. Beesley), of Ammonites annulatus. At 

 King's Sutton, hard by, is another excavation into the marlstone ; 

 but it is without the overlying Upper Lias, and the beds are 

 altogether a little lower in the series than those at Adderbury. 

 The village of King's Sutton, though so near Banbury, is in North- 

 amptonshire ; but care must be taken not to confound the iron-works 

 there with those in the Northampton Sands, which are in quite a 

 different formation. 



Appendix. 



Since the foregoing was written I have examined some other 

 Lias corals, one of which is certainly new. 



A small discoid Montlivaltia from the coral zone at Penny 

 Compton was exhibited by Mr. Beesley at the meeting of the 

 Warwickshire Naturalists' and Archaeologists' Field Club in February 

 last as Montlivaltia radiata. An examination has convinced me 

 that it is quite distinct both from it and from Montlivaltia nummi- 

 formis, and that it is undoubtedly new. I describe it as 



Montlivaltia papykacea, n. s. (PL IX. fig. 9.) 



Corallum discoid, symmetrically round, extremely thin and delicate, 

 and attached by the centre of its base. 



Wall perfectly horizontal, flat ; its extreme margin thin, free, and 

 entire. 



Epitheca thin, but very distinctly imbricated concentrically. No 

 appearance of costae. 



Calice highest in the middle ; septa straight and retaining their 

 thickness as they approach the centre. They constitute five cycles. 

 Those of the first, six in number, thicken a little toward the centre, 

 where they meet but do not blend ; those of the second approach 

 nearly, but do not reach the centre ; those of the third are three 



