452 B. F. Tomes — Inferior Oolite Madreporaria. 



peduncular foot is surmounted by a tuber-shaped top, which is com- 

 posed of overlapping leaflets, and where the lateral margins of these 

 meet on the upper surface, they curl up and form ridges having 

 precisely the same sinuosity as the margins of the leaflets. It is 

 only, however, at the outside of the corallum that the outline 

 of the leaflets can be satisfactorily traced. On the whole of the 

 central part they are too much fused together to be followed except- 

 ing as sinuous ridges, which being worn down, reveal the hidden 

 wall within. 



In 1884, when Prof. Duncan published his Eevision of Families 

 and Genera, he did not admit that there was any wall in the collines 

 of Comoseris : but in his recently published paper in the Journal of 

 the Geological Society he acknowledges that there is a false wall. 

 This is a step in the right direction. With patience and further 

 research a true mural structure may yet be arrived at. 



This is the only species I have met with which is common to the 

 Pisolite and the overlying Coral-bed ; but as the specimen from the 

 former deposit was found in the friable or disintegrated part, it may 

 have fallen from above and have been embedded. 



Phylloseris incrustata, Mich. sp. 



Alveopora incrustata, Mich. Icon. Zooph. p. Ill, pi. 25, fig. 8, 1840-47. 

 Microsolina incrustata, M. Edwards, Hist. Nat. Corall., torn. iii. p. 201, 1860. 

 Phylloseris, sp. Tomes, Q. J. G. S. vol. xxxviii. p. 448, 1882. 



The species of Phylloseris which I indicated at page 448 of my paper 

 on Inferior Oolite Corals is obviously identical with the Alveopora 

 incrustata of Michelin. Although described by that author as a 

 dendroid species, and having the "rarueaux" partially covered by an 

 irregular " croute," it is obvious by the figure that it has more of 

 a digitate than a dendroid growth. That it is a second species of 

 Phylloseris, differing chiefly from P. rugosa in the form of the coral- 

 lites and the size of the calices, I have no doubt. The epitheca 

 extends upward by degrees and obliterates the calices, just as it does 

 in Phylloseris rugosa. 



Latijvleandraria concentrica, Tomes. 

 Oroseris concentrica, Tomes, Quart. Journ. Geol. Soc. vol. xxxviii. p. 441. 



In a paper on the Madreporaria of the Coral Eag (Quart. Journ. 

 Geol. Soc. vol. xxxix.) I suggested that a species of Oroseris which 

 I had before described as Oroseris concentrica, probably appertained 

 to another genus. I now place it in Latimasandraria, and I do so 

 for the following reasons. As clearly pointed out by me, Oroseris 

 may be recognized by its mode of gemmaparous increase, which is 

 calicular or marginal, while in Latimceandraria, Thamnastraa, and 

 some other genera, it is intercostal. As it is also intercostal in the 

 present species, I now place it in the former of these genera. 



In conclusion I wish to render my very sincere thanks to Mr. 

 Hudleston, Mr. Buckman, and Mr. Jas. Windoes for their liberal 

 assistance in the use of specimens from their several collections. 



