TERTIARY CORALS. 49 



In the Museum of Practical Geology, London, and in the collection of Frederick 

 Edwards, Esq., F.G.S. 



Lohopsmiimia cariosa is a common fossil at Brockenhurst, and the specimens differ in 

 the stoutness of the corallum and distinctness of the costse. There is a so-called species, 

 L. dilatata, Roemer,^ from Latdorf j'' but it is not worthy of more than the title of a variety 

 of our widely diffused form. The same may be determined with respect to L. Parisiensis, 

 Michelin, sp. 



^^CTio^—MABBEPOBABIA PEBFOBATA. 

 Eamily— PORITIDES. 



Sub-famili/—VORnimM. 



Genus LiTHARyEA. 



LiTHAKjjA Brockenhursti, Buncan. Plate VII, figs. 17, 18. 



The corallum is massive, irregular in shape, and has an uneven upper surface. The 

 corallites are close, and are very rarely separated by umch reticulate cellular structure ; 

 they are rather short, and vary in their diameter in different parts of the corallum. The 

 walls are well marked. ' 



The calices are shallow, close, and generally quadrangular. The margins are formed 

 by trabecular tissue, and the septa are irregular, unequal, wavy, and are often enlarged at 

 the inner end ; their laminae are much perforated ; they are in six systems, and there are 

 three cycles, the primary being the largest ; the others are often very small. The laminae 

 are faintly dentate laterally. 



The columella is slightly developed, and appears to be formed by processes from the 

 septal ends. Diameter of the calices ^ths inch. 



Locality. Brockenhurst. In the collection of Frederick Edwards, Esq., F.G.S. 



The scanty coenenchyma, the shallow and quadrangular calices, the three cycles of 

 unusually perforate septa, the ill-developed columella, and the shape of the corallum, dis- 

 tinguish this species from LitJiarcea Websteri and the Litharcsm of the French Tertiaries. 



The genus ranges from the Maestricht Chalk to the Faluns at Dax. 



' Roemer in Bunker's 'Palseontograpbica,' 1862 — 1864. 

 2 In the Lower Oligocene. 



