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450 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 6, 



In the yellow shale there is a ramose Coral which, provisionally, 

 is classed with Phyllocoenia. With one exception, its structural 

 characteristics agree with a very remarkable Coral which has been 

 referred to many genera, having been called by Goldfuss Madrepora 

 limbata, by Bronn Oculina limbata, by M'Coy Gemmastrcea limbata, 

 and by Milne-Edwards Stylina limbata. Our species has no colu- 

 mella visible ; and although it is notorious that the little sharp colu- 

 mellas of Stylince constantly fall out, still I have considered it advisable 

 to disregard this and to classify the form with Phyllocoenia, and to 

 state the probability that other specimens will determine the presence 

 or absence of a columella. Another species so closely resembles 

 Phyllocoenia sculpta (Michelin, Zooph. pi. 71. figs. 1 &3), that it can 

 only be considered a variety with a tile-shaped corallum. Phyllo- 

 coenia sculpta is from the Hippurite-limestone of Martigues. There 

 are no existing forms known, and it is worthy of notice that the San 

 Domingan species are but very distantly allied to the Eocene and 

 Miocene species of the genus. 



Brachycyathus, known amongst European Corals from the Neoco- 

 mian, has a species at San Domingo, very remote, however, from B. 

 Orbignyanus. 



Stylophora, a genus closely allied to Astrocoenia and to the Oculi- 

 niclce, is represented by one species in the Blue Shale of San Domingo ; 

 it is more closely allied to the Miocene species from Dax, Gaas, and 

 Turin than it is to any recent one. The recent Stylophora mirabilis 

 of the West Indies is a doubtful species, but many live around the 

 Fejees, East Indies, Seychelles, Zanzibar, and the Cape of Good Hope, 

 and in the Red Sea. 



Siderastrwa crenulata, a well-known species from the Gironde 

 Miocene, has a variety^in the Blue Shale of San-Domingo. There is 

 a very close resemblance between all the Siderastrceai, but the recent 

 West Indian species are clearly more allied to the Miocene forms than 

 the latter are to the Eocene species. 



Flabellum is represented by two species in the Blue Shale, and in 

 the Limestone there are many examples of impressions which pro- 

 bably denote a third. F. clubium of the Shale resembles in some 

 points Flabellum Galapagense, Edwards & Haime, from the Miocene 

 of the Galapagos. There are no recent species in the West Indies, 

 but they abound to the west of America. 



Placotrochus, a genus inhabiting the coral-sea of the Philippines 

 and China, has a fossil species both in San-Domingo and Jamaica. 



Trochocyathus cornucopia, Edwards & Haime, a species common 

 to Tortona and the Yienna Miocene, is represented in the San-Do- 

 mingan Tertiary beds ; it is so characteristic a form that it stamps 

 their age satisfactorily. 



The San-Domingan Thysanus corbicida is allied to the Jamaican 

 Thysani ; but these beautiful corals do not appear to have any very 

 close recent allies, although they have affinities with Flabellum, Bhi- 

 zotrochus, and Oeratotrochus. 



Dichocoenia tuberosa, a common fossil of the Blue Shale, belongs to 

 a genus doubtfully represented in the French Gres Yert, but well 



