R. F. Tomes — Some Cretaceous Madreporaria. 545 



under consideration is set at rest. There is, however, one peculia- 

 rity about which I am bj' no means satisfied. I allude to the single 

 layer of dissepiments which is visible a little above the basal wall, 

 all round the corallum, like a tabulum. It is well figured by Prof. 

 Duncan, who speaks of it as consisting of large synapticulse. But 

 that it is dissepimental in its nature I have not the least doubt, the 

 downward curvature in each loculus being only what is observable 

 in the dissepiments of some Montlivaltice, though in that genus they 

 are never arranged so as to form a tabulum. I may also allude to 

 the great flatness of the whule of the under surface, and of the costee, 

 as well as the regularity in the size of the latter, as differing from 

 the same parts in typical specimens of Cydocyatlius Fittoni. It cannot, 

 however, be considered as anything more than a variety of that 

 species, and of course the existence of this second species of Micra- 

 bacia is inadmissible. 



Barysmilia ttjberosa, Eeuss. Beitr. Charak. Kreid. Ostalpen, p. 91, 

 pi. X. figs. 14—15, 1854:, Deuts. K.K. Akad. Wien, vii. PL XIV. 

 Fig. 15. 



A species of Barysmilia from the Upper Greensand of Haldon has 

 long been known to me. A specimen in my own cabinet, though of 

 small size, agrees so nearly with the description and figure given 

 by Eeuss of Barysmilia tuherosa, that there can be no doubt as to its 

 identity with that sjiecies. The calices in this specimen are rather 

 more irregular in form and are more closely placed than they appear 

 in the figure alluded to. The small size of this and the following 

 species, compared with the examples figured by their respective 

 describers, is in accordance with the stunted form of other compound 

 corals from the same locality, though some of the simple ones are of 

 relatively greater size. 



Barysmilia Cordieri, M. Edw. and Haime. Ann. des Sci. Nat. 3rd 

 ser. t. X. p. 273, pi. 5, fig. 4, 1849. E. de From. Pal. Frany. 



Polyp. Terr. Cretace, p. 385, pi. 86, fig. i. 1873. PL XIV. Fig. 14. 



In the elevated and almost cylindrical form of the peduncular parts 

 of the corallum, in the ovoid or round and comparatively small size 

 of the calices, and in the number and delicacy of the mural costee 

 and septa, the only specimen yet obtained agrees closely with the 

 figure and description of Barysmilia Cordieri of MM. Milne 

 Edwards and Haime. But while the figure above mentioned repre- 

 sents a corallum of four inches in height, the specimen now before 

 me is only one inch high. This specimen was obtained from Haldon 

 with the last species. No locality is assigned to the present 

 species by MM. Milne Edwards and Haime, but M. de FromenteL 

 who copies their figure, mentions its occurrence in the Craie tuffeau 

 of Mamers (Sarthe). 



Some other compound corals have been collected at Haldon, which 

 from their unsatisfactory condition cannot be determined, though I 

 believe them to be new. As the Haldon corals ai'e only casts, they 

 cannot be trusted when internal structure is important. The genus 

 Haldonia is in my opinion a very doubtful one. Specimens in my 



DtCAlJE 111. — YOL. 11. — NO. Xll. 35 



