16 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [DcC. 4, 



in pure white chalk ; but the rest are surrounded and included in the 

 usual reef-detritus, are of a light-brown colour, are usually very- 

 hard and heavy, and present much crystalline carbonate of lime. 

 There is nothing like the condition observed in the Antiguan fossil 

 Corals ; and, as a rule, the Mollusca imbedded with the Corals are in 

 the form of casts. 



Some of the more massive specimens of the Heliastrcem and 

 Stephanocoenice present a fracture which resembles that of Echino- 

 derm remains. 



7. Bemarhs on San-Domingan Fossil Corals. — A careful examina- 

 tion of the collections in the Society's Foreign Museum and in the 

 British Museum enables me to add some species to the Coral-fauna 

 of the TsTivaje shale, as well as to correct some errors in my former 

 communication. 



Better specimens of Brachycyathus Henekeni, nobis, and an ex- 

 amination of the Cretaceous species of Europe prove that the smaU 

 Corals described under this genus are ParacyatJii. 



Paeactathtjs Henekeni, Duncan, 1 867. 

 Brachycyathus Henekeni, Duncan, 1863. 



(See the specific diagnosis, Proc. Geol. Soc. May 6, 1863, p. 426.) 



The pali are before the primary and secondary septa, and are 

 largest before the tertiary when the system is complete. The pali 

 are entire, small, and papillose. The columella is formed with the 

 ends of the septa, and is small. 



Several specimens of Trochocyathus abnormalis, nobis, indicate 

 the necessity of removing the species from the genus Trochocyathus, 

 and of establishing a new genus for them under the name of Aste- 

 rosmilia. 



The occurrence of pali and endotheca in three species has deter- 

 mined the diagnosis of this new genus, which links together the 

 great collection of genera of simple Corals with and without endo- 

 theca, viz. the Caryophyllincie and the Astrceidce. 



The descriptions of the new genus and species are given in Phil. 

 Trans. Eoyal Soc. 1867. 



ASTEfiOSMILIA ANOMALA, DuUCaU, 1867. 



Trochocyathiis ahnormalis, Duncan, 1863. 



AsTEROSMiLiA coENUTA, Duncan, 1867. 



AsTEEOSMiLiA EXAEATA, Duncau, 1867. 



Mantcina aeeolata, Linnaeus, sp. 



This species is common in the Caribbean sea ; and a fossil speci- 

 men was found in the Mvaje shale. 



Elabellum exaratum, nobis (Proc. Geol. Soc. Nov. 9, ] 864). 



A small specimen has been found in the Mvaje shale, the tj^pe 

 having been discovered at Yere, in Jamaica. The species is also 

 found in Cumana*. 



*• J. L. Gruppy, op. cit. 



