442 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 6, 



pendicular in the largest; their base appears to rest on the colu- 

 mella, and the upper corner is very angular and free. Laminse 

 marked by distinct rows of granules, which are less developed in- 

 ternally and inferiorly. The septa are thicker at the wall than 

 elsewhere. Endotheca not to be distinguished except in fractured 

 specimens, but it is well developed. Exotheca represented here and 

 there by a few dissepiments. Height of corallite 1 -J- inch, length 3J- 

 inches, breadth 2| inches ; length of columella 1 inch 1 line, breadth 

 4 lines, height 4- inch ; height of septal edge above the columella 

 3| lines. 



A younger specimen has the corallum very short, and more con- 

 vex than the other, also shield-shaped below, and the central pro- 

 jecting boss, like a pedicel. Epitheca tolerably developed. Calice 

 less elliptical; sides more curved, and the plane of the short axis 

 higher than in the larger specimen. Fossa a little deeper. Septa 

 more acutely and slenderly spined, as well as the costae ; some spines of 

 the septa are very straight and sharp, all are slender ; in six systems of 

 five cycles. Columella as in the large specimen, very distinctly sepa- 

 rated from the wall. Exotheca barely a trace. Length of corallum 

 1 inch 8 lines, breadth 1 inch 5 lines, height 8 lines without the boss. 



The close affinities of the genera CaryophyUia (Lithojphyllia)*, Cir- 

 copliyllia, and Monilivaltia account for the synonyms of this great 

 simple Coral. If the central fossa had its foundation on the base of 

 the coral-wall, and if the septa had met internally, as they usually 

 do in Astraeans without columellse, there would have been no dif- 

 ficulty in classifying the species amongst the Montlivaltice ; but it is 

 by no means improbable that a genus will have to be determined 

 which will admit these simple corals with a columella and an epi- 

 theca, especially as new forms are presenting themselves daily for 

 examination. I have noticed a young C. ponderosa amongst some 

 Miocene fossils from Travancore, and, therefore, it occurs in the Ter- 

 tiaries of Postrero, San Domingo, and of Jamaica, and also in the 

 Miocene of Guadaloupe and Travancore. 



Coll. Geol. Soc. and Brit. Mus. 



8. Astr^ina Dendroldea, gen. et spec? 



A dendroid Astrsean, multiplying by fissiparity, and forming a 

 bush-like mass, but taller than broad ; it is much altered by fossiliza- 

 tion, all the details, except the general shape and the walls, having 

 been destroyed. 



9. Alveopora DiEDALJiA, var. regtjlaris. PL XIY. figs. 4 a, 4 b. 

 From hard white limestone, in the form of casts, as at Antigua. 



10. PORITES. 



Several specimens of casts of a massive Porites from the limestone ; 

 the details, except the reticulations, are destroyed. 



* The term Caryopliyllia has been applied by Edwards and Haime (Hist. 

 Nat. des Corall.) to the forms previously comprehended under the well-known 

 generic term CyatMna, and the former Caryophyllians are termed LithopTiyllia. 

 I retain, however, the older and generally received nomenclature. 



