R. F. Tomes — Inferior Oolite Madreporaria. 449 



In the description of the so-called Clausastrcea Pratti by the 

 original describers it is stated that the calices are not separated by 

 a distinct wall ; all the Coombe Down specimens I have seen, 

 whatever their condition, accord in this particular with the type. 

 They are equally destitute of surrounding wall, whether they 

 have the irregular form of those of Clausastrcea Pratti, or the more 

 regularly defined ones of Isastrcea Conybeari. Turning to the de- 

 scription of the genus Plerastraa by MM. Milne Edwards and 

 Haime, M. de Fromentel, and Prof. Duncan, I observe that special 

 mention is made of the presence of walls surrounding the calices. I 

 must therefore still contend that Platastroea is generically distinct 

 from Plerastrcea, which has distinct walls bounding the calices. 



Further, I must continue to assert the identity of the two species 

 Isastrcea Conybeari and Plerastrcea Pratti, the latter being nothing 

 more than a small specimen having an irregular growth, and a cor- 

 responding irregularity in the development of the calices. And T 

 must repeat my assertion that the same specimen of this variable 

 species will on different parts present the appearances represented 

 by the figures given by MM. Milne Edwards and Haime of Isastrcea 

 Conybeari and Plerastrcea Pratti. 



Genus Leptophyllia, Eeuss. 



The conclusions of M. Pratz respecting the structure of the coral- 

 lum of the genus Leptophyllia were based on the examination of 

 specimens of the very species on which Eeuss established the genus. 

 They were obtained from the Cretaceous formation at Gosau, and he 

 observes that proof is yet wanting that these Cretaceous and other 

 subsequently described species from the Oolites are generically 

 identical. At present my knowledge of the Oolitic Leptophyllise is 

 confined to the examination of a few examples of a small species 

 from the Inferior Oolite. In these I observe the same form of 

 pseudo-synapticulee as in the Gosau Leptophylliee, and in the 

 genus Thamnastrcea ; they therefore, very probably, appertain to the 

 genus Leptophyllia. One of these small and malformed Oolitic 

 Leptophyllice, from the Inferior Oolite of Dorsetshire, has been figured 

 and described by Prof. Duncan under the name of Podoseris constricta. 



Leptophyllia Flourestt, E. de From., 

 Pal. Franc. Terr. Jurass. Corall. p. 93, pi. 27, figs. 1-4, Oct. 1866. 



One example of this species has been taken from the Oolitic Marl 

 at Leckhampton by me, and I have another given to me by my 

 friend Mr. W. C. Lucy, which he obtained from a bed of angular 

 oolitic gravel near Painswick. The Painswick specimen is mis- 

 shapen, and has a curiously close resemblance to figure 3 of the 

 plate above quoted. 



Genus Thecoseris, E. de From. 

 Palceoseris, Duncan. 

 Since the publication of my paper in which the description of 

 Thecoseris polymorpha appears, I have examined a specimen of that 

 species which had been split through vertically, showing the sides 



DECADE III. VOL. III. NO. X. 29 



