514 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [June 17, 



Jamaican Tertiaries is very remarkable : like Phyllocoenia sculpta in 

 San Domingo, and the Isastrseans in Antigua, it belongs to a Coral- 

 fauna -which died out in the Miocene period. 



5. Thysantts excentrictts, nobis. "Fossil Corals of the West Indies," 

 p. 439. PI. XVI. fig. 3. 



These beautiful Corals are allied to the Thysani of San Domingo. 

 From Jamaica and San Domingo. 



The other Fossil Corals from Jamaica, in this collection, and which 

 I have described already, are Alveopora Dcedalcea, Dana, and Sider- 

 astrcea grandis, nobis. — [P. M. D.] 



Note on some Nummulinje and Orbitoides from Jamaica. 

 By Professor T. Rupert Jones, F.G.S. 



In connexion with Mr. J. C. Moore's researches on the Tertiary 

 Molluscs of Jamaica, the following remarks on some specimens of 

 Nummulites * and Orbitoides from the same island will be of 

 interest. 



Some time since, Mr. S. P. Woodward, F.G.S. , submitted to my 

 examination a water-worn piece of Orbitoidal limestone from 

 Healthful Hill, St. Thomas-in-the-East, collected by the Hon. Edw. 

 Chitty. Among the Orbitoides constituting the mass of this hand- 

 specimen (6 inches x2| x2), three or four Nummulince are visible 

 on the surface, and their internal structure has been sufficiently well 

 exposed by weathering. The Orbitoides are similar to those found 

 fossil in the Upper Chalk of Southern France and the Pyrenees, 

 and in the Nummulitic beds of Scinde (0. media, 0. dispansa, (fee.). 

 The Nummidinw, differing only in size one from another, belong to 

 the sinuo-radiate group t, and are near to the forms known as 

 Nummulina perforata and N. Rouaulti. The largest is about | inch 

 in diameter and ^ i ncn ^ thickness. 



Orbitoides are not confined to this nodular limestone in Jamaica, 

 but are there found as low down as the Cretaceous Limestone, with 

 Nerincea and Barrettia%\ and here the thick variety (0. Fortisii) 

 and the thin (0. papyracea) are both abundant. 



When Mr. Barrett, the late Director of the Geological Survey of 

 the British West Indian Isles, was in England last year, he showed 

 me, by the following diagram, the position of this Orbitoidal Limestone 

 in the geological series of Jamaica. He stated that it occurred as 

 nodules in clay just underneath the great " White Limestone," which, 

 with overlying shaly and sandy beds, I understood him to refer to 



* De la Beche has recorded the occurrence of " Nummulites " in Jamaica 

 (Geol. Trans. 2nd ser. vol. ii. p. 170) ; but it is doubtful whether the fossils he 

 alludes to may not have been Orbitoides, winch are common in that island. 



f See Ann. Nat. Hist. 3rd ser. vol. viii. p. 233, and Carpenter's Introd. 

 Foram. p. 275. 



I See Mr. Woodward's paper on " Barrettia and other Hippurites," in the 

 1 Geologist,' vol. v. p. 373. De la Beche seems to have regarded some of the 

 Orbitoides as " Encrinal remains " (Gcol. Trans. 2nd ser. vol. ii. p. 158), as 

 Mr. Woodward has remarked. 



