306 R. F. Tomes — British Cretaceous Madreporaria. 



confirmed the great irregularity of septal development in the genus 

 CcBlosmilia, in so far as C. laxa is concerned ; and as the same thing 

 has been noticed in C. pociihim, C. Fanjasi, and C. punctata by 

 MM. Milne Edwards and Haime, and in C. Woodioardi by Professor 

 Duncan, we are justified in regarding it as having more than specific 

 value, and as, I think, of more than subgeneric significance. 



Of the Jurassic representatives of the genus Codosmilia reputed to 

 have been found in the Nattheim Oolite, I am unable to speak. 



Ehizangia mammiliformis, Dune, sp. 



Podoseris mammiliformis, Dune. : Supp. Brit. Fos. Cor., 1869, pt. ii, 

 No. 1, p. 25, pi. ix, figs. 2-15. 



I have examined several other specimens of this coral since the 

 appearance of my paper in 1885, in which the stolon connecting the 

 corallites is well preserved and obvious. I regret, however, that the 

 opportunity has not occurred for examining any of the earlier known 

 species of Rhizangia by means of sections, and ascertaining whether 

 their septa have a pseudo-synapticular growth or not. There is no 

 doubt whatever that the present species has septa which do not 

 differ materially in structure from those of Thamnastraa and that 

 there are also tabular dissepiments between them. 



Of the second species, Rhizangia elongata, there is great doubt 

 respecting its specific distinction. The taller the specimen, the more 

 irregular is the outline ; the smaller and more deformed the calice, 

 the more abnormal is the cycle of septa. In. fact, the elevated 

 specimens present much the appearance often seen in other simple 

 forms, namely, an abnormal and excessive growth, just what is not 

 uncommon in certain species of Moiitlivaltia. Rhizangia elongata is 

 at best a doubtful species. 



Leptophyllia olavata, Eeuss. 



Leptophyllia clavata, Eeuss : Denk. der Wiener Akad. der Wiss., 



1854, t. vii, p. 101, pi. vi. figs. 3-6. 

 Turbinoseris de Fromenteli, Dune: Supp. Brit. Fos. Cor., 1870, pt. ii, 



p. 42, pi. XV, figs. 13-18. 

 Leptophyllia Anglica, Tomes: Geol. Mag., 1885, p. 551. 



Continued investigation has made it quite obvious that the coral 

 which Professor Duncan described as Turbinoseris de Fromenteli, and 

 which I subsequently named Leptophyllia Anglica, is nothing more 

 than the Leptophyllia clavata of Eeuss, the very species on which 

 the genus Leptophyllia was founded. 



Leptophyllia irregularis, Eeuss. Plate XIII, Fig. 1. 

 Leptophyllia irregularis, Eeuss : Denk. der Wiener Akad. der Wiss., 

 1854, t. vii, p. 101, pi. vf, figs. 2, 3. 



One instance only of the occurrence of this fine species in 

 this country has come to mj/^ knowledge. It was obtained by 

 Mr. F. H. Butler from the Lower Greensand at Sandown, Isle 

 of Wight, out of the same bed which has supplied the 

 Leptophyllia clavata. I have compared the specimen, which is 



