12 PEOCEEDIK^aS OF THE GEOLOGICAL SOCIETT. [DeC. 4, 



Venezuela; it consists of mica-slates, quartzose slates, shales, and 

 sandstones &c., greatly contorted to the north and south, and dip- 

 ping very generally to the south in the central part of the mass. Its 

 age is unknown ; and its connexion with the Tertiary series does 

 not appear to be made out satisfactorily. 



The fossiliferous deposit at St. Croix is in the same series as the 

 cliffs at San Fernando described by Mr. Guppy; and that author 

 decides that the alliances of the fossils from the limestones of San 

 Fernando are closer with those from the Jamaican Miocene than 

 with those of the Chert of Antigua. But the corals found in the 

 same series as the San-Fernando Limestones (the Faparima Marl), 

 which are about to be described, are closely allied to those of the 

 Chert and Marl of Antigua and the Nivaje shale of San Domingo. 

 The majority of the Jamaican corals belong to species which indi- 

 cate deep water ; but those of Trinidad are reef species ; so that the 

 essentiEils for comparison hardly exist*. JS'evertheless there is a 

 sufficient community of species to correlate the Trinitatian Miocene 

 with all the coralliferous deposits which have been described in the 

 various islands in a wide sense ; but it is impossible to assign a cor- 

 rect order of succession. 



Certainly the Trinidad deposits which yield the Corals are not of 

 greater age than the Nivaje Shale, the coralliferous beds of Yere, in 

 Jamaica, and the Antiguan Chert and Marl ; and there are no data 

 by which a Lower, Middle, and Upper Miocene may be established 

 in the Caribbean area so as to correspond with the divisions of the 

 European Miocene. 



3. List of the Species of Fossil Corals from St. Croioo, Trinidad. — 



1. Heliastrsea endothecata, Dune 



2. cylindrica, Buoic. 



3. Barbadensis, Dune 



4. cavernosa, Esper, sp.t 



5. altissiraa, sp. nov. 



6. Brachyphyllia Eckeli, sp. nov. 



7. irregularis, sp. nov. 



8. Astreea Pariana, sp. nov. 



9. Isastrasa confusa, sp. nov. 



10. Stylopbora raristella, Defrance, sp. \ 



11. Stylophora miniita, sp. nov. 



12. mirabilis, MicheloUi et Du- 



chassaing\. 



13. Stephanocoenia intersepta, Esper, 



sp.t§. 



14. Agaricia agaricites, Lamar ch\. 



15. undata, LamarcJcf. 



16. Porites Collegniana, Mich.\ 



17. astroides, Lamarck^. 



18. Alveopora Dagdalsea, Blainville^. 



4. Descriptions of the new Species from Trinidad. — 

 Heliaste^a ALTissiiiA, spcc. nov. Plate II. fig. 3. 



The corallum is very massive and taU, and its upper surface is 

 subplane and wider than the base. The calicos are barely above 

 the common surface, they are circular, but occasionally deformed, 

 and they are slightly unequal in size. The calicular fossa is shallow, 

 and the calicular margins are broader than the septa. The columella 



* Duncan, "West-Indian Fossil Corals," Quart. Journ. Greol. Soc. Nov. 1863, 

 and Feb. 1864; and Duncan and Wall, Quart. Journ. Gaol. Soc. Nov. 1864. 

 t Species of the present West-Indian Coral-fauna. 

 I Species of the European Miocene deposits, 

 § Species of the present Pacific Coral-fauna. . 



