394 H. F. Tomes — Inferior Oolite Maclreporaria. 



Hill are attached, the one to a corallite of Donacosmilia, and the 

 other to a shell. They are three times the size of the figured 

 specimen. 



Several specimens of this species obtained from the Inferior Oolite 

 in the railway-cutting at Hook Norton, Oxfordshire, have been sent 

 to me with other Oolite corals by Mr. Hudleston. In all of these 

 the flattened side, though visible, is only a little indicated. 



Milaschewitsch pointed out that Oppelismilia gemmans, Duncan, was 

 nothing more than a Montlivaltia which had been subjected to that 

 sort of interrupted growth to which he gave the name of rejuven- 

 escence. This growth, Professor Duncan maintains, is only what was 

 long ago called by MM. Milne Edwards and Haime, " bourrelets 

 d'accroissement," or growth-rings. It is, however, at the present 

 moment, quite unimportant under what name we speak of it, but it 

 is very important that we should distinguish very clearly between 

 it and calicular budding, which is wholly different. But after the 

 recent remarks by Professor Duncan on the subject, I can only con- 

 clude that he still confounds the two processes. He now places in the 

 subgenus Oppelismilia the so-called Montlivaltia Holli, the "Mont- 

 livaltia turbata, Milasch., and any forms which Mr. Tomes may have 

 noticed with calicular budding." If the so-called Oppelismilia 

 gemmans has calicular budding, then have we a very extensive list 

 of species of Oppelismilia, and the much crowded and difficult genus 

 Montlivaltia will be materially and unexpectedly relieved. A very 

 large per-centage of Lower Lias Montlivaltia? will have to be with- 

 drawn from that genus, and amongst others Montlivaltia rngosa, 

 M. mucronata and M. Haimei, while from the Oolitic Montlivaltia? 

 a goodly number must also be eliminated. 



In like manner a considerable number of genera or subgenera 

 will have to be created for such compound corals as have the same 

 sort of growth as in the so-called Oppelismilia. For instance, I have 

 now before me a specimen of Cladopliyllia Babeana, some of the 

 corallites of which exhibit gemmation, supposing it to be gemmation 

 which takes place in the supposed Montlivaltia Holli, and if one 

 species of the genus Cladopliyllia is really subject to calicular budding, 

 it must, by a similarity of argument to that applied by Prof. Duncan 

 to Montlivaltia, be separated from the other species of Cladopliyllia. 

 But it is an error to suppose that calicular budding takes place 

 in either case, and even had it been so, it would still have been in- 

 consistent in the extreme to retain Montlivaltia Holli (which is 

 distinctly affirmed to have calicular budding) in the genus Mont- 

 livaltia, while for another Montlivaltia a new genus (Oppelismilia) was 

 formed, for no other reason than that it had calicular budding. 



Montlivaltia concinna, Tomes. 



Subsequently to the description of this species several specimens 

 were obtained, and with the exception of a single example they were 

 taken from the Pisolite. They confirm the specific characters already 

 given. This species may now be regarded as being invariably 

 attached by a somewhat expanded foot, and as having an undulating 



