302 JR. F. Tomes — British Cretaceous Madreporaria. 



The name of CaryophylUa conulus was given by Phillips in 1835 to 

 a coral found in the Speeton Cla}' of Yorksliire ; and having obtained 

 a number of specimens from that locality which are obviously 

 identical with the coral figured by Phillips, I have been enabled 

 to compare and identify these with specimens from the Folkestone 

 Gault, and to clear up the synonymy of the species. 



Trochocyathus conulus, as I now restrict it, never attains to the size 

 of the specimens from the Cambridge Greensand described by 

 Professor Duncan as Smilotrochus eJongata, which latter, it should be 

 remembered, are only casts of the interior, and are not nearly so 

 large as the perfect coral would be. Tlie figures of Trochocyatlms 

 conulus given by Phillips and Michelin represent very full-sized 

 examples, but most of the specimens from both Speeton and 

 Folkestone are smaller and less regular in form, 



Michelin gives two figures of this species, one being of an adherent 

 coral and the other of one that was free. The latter is a good 

 representation of Trochocyatlms conulus, but the former is more like 

 T. Wiltsliirei than T. conulus, both of which species are found 

 associated at Folkestone. In none of the specimens from Speeton 

 which I have seen is there an adherent foot. 



The more elongated corals from the Gault at Folkestone described 

 and figured by Professor Duncan as Smilotrochus cylindricus occur 

 also at Speeton. They have both columella and pali, and are certainly 

 Trochocyathi — indeed, nothing more than elongated individuals of 

 Trochocyathus conulus. 



Trochocyathus Wiltshirei, Duncan, 

 Trochocyathus Wiltshirei, Dune. : Supp. Brit. Fos. Cor., 1870, pt. ii, 



p. 34, pi. xiv, figs. 10-12. 

 Smilotrochus granulatus, Dune. : loc. cit., p. 76, pi. xiv, fig. 17. 



Since the appeai'ance of my former paper in 1885 I have examined 

 many specimens of this species, and while 1 am satisfied that it is 

 a good one I am more than ever convinced that the so-called 

 Smilotrochus granulatus is nothing more than the young form of it. 



Trochocyathus ? caloaratus. Tomes. 

 Sfnilotrochus calcaraius, Tomes : Geol. Mag., 1885, p. 543. 



Of this very peculiar species I can now say that its characters are 

 by no means those of Smilotrochus. The ragged spines of the septa, 

 which increase in size and prominence as they approach the fossula, 

 obscure the latter part so much that examination is difficidt, but they 

 meet and blend in the centre of the calice, with what I have little 

 doubt is a true but small columella. Moreover, in some of the better 

 preserved calices there is a somewhat circular disposition of the 

 spines around a centre, indicative of the presence of pali. And if 

 there is both columella and a ring of pali, the species must be 

 referred to the genus Trochocyathus. 



Besides occurring in the Gault at Folkestone, the present species 

 has been found in the Speeton Clay of Yorkshire, from which locality 

 I have a well-preserved specimen, in which there are certainly 

 evidences of the presence of a columella. 



