R. F. Tomes — Liassie Madreporaria. 109 



fering only from the Marlstone beneath in being less compact. 

 As I have already stated, the late Mr. Moore gave sections of the 

 Upper Lias exposed in the quarries on the hills at Stanley and 

 Dumbleton, a reference to which will show that the two sections 

 very closely resemble each other. 



In the paper alluded to is also a detailed section of the Upper 

 Lias at Ilminster, from which Mr. Moore obtained the corals figured 

 by MM. Milne Edwards and Haime, under the names of Thecocya- 

 tlius Moorei, and Trochocyathus primus. A comparison of the 

 Ilminster section with the one here given of the Upper Lias at 

 Dumbleton hill will show that the corals from the latter place and 

 from Stanley hill occupy a very different place in the section to the 

 species just mentioned ; but they, as already observed, correspond 

 stratigraphically with those from Adderbury and Chipping Warden, 

 and one of the species, as I shall show, is the same. 



Two species, representing two genera, were collected at Stanley 

 hill, namely Thecocyathus and Trochocyathus. 



Theoocyathus tubercula.ttjs, Tomes. 

 MontKvaltia ? tuberculata, Tomes, Quart. Journ. Geol. Soc, vol. xxxiv. p. 192, 

 1878 (read 1877). 



The greater number of the specimens collected at Stanley hill are 

 referable to the species which I have erroneously, but with an 

 expression of doubt, described as a Montlivaltia, under the name of 

 Montlivaltia 1 tuberculata. Their state of preservation being very 

 superior to that of the Oxfordshire specimens, from which I took my 

 description, I am now enabled to amend it very considerably, and to 

 place the species in another genus. 



All the Stanle3 r hill specimens are rather smaller than the ones 

 from Adderbury or Chipping Wai'den. The general form of the 

 corallum is similar in the specimens from all these localities, 

 and the calice of those most satisfactorily preserved is superficial, 

 and varies from a slight convexity to a slight concavity. There are 

 three complete cycles of septa and a rudimentary fourth. Those of 

 the first pass quite into the columella, and those of the second 

 approach it very nearly. The septa of the third cycle ai-e two-thirds 

 the length of those of the second. Those of the first and second 

 cycles have their outer half crenulated rather than tuberculated, 

 while their inner half has strongly marked paliform tubercles, 

 which are four in number on the primary septa, and three on the 

 secondary ones. Sometimes there is a single paliform tubercle on 

 the septa of the third cycle, but this does not seem to be a constant 

 character, and its appearance is perhaps regulated by the age of the 

 individual. In some specimens these tubercles are much more 

 prominent than in others, but all in the same calice have an equal 

 prominence and are equal in size. The columella has very little 

 prominence ; it is small, porous, and irregular, and the tubercles on 

 its upper surface correspond with those on the septa from which, in 

 the unworn calice, they are undistinguishable. The appearance 

 presented by the most perfect examples is that of a central area 

 filled with equal, round, and equally prominent tubercles ; but when 



