1863.] DUNCAN WEST INDIAN CORALS. 437 



breccia from the Nivaje shale differs from the typical form of S. 

 affinis by having its calices much wider apart, and consequently by 

 having more ccenenchyma. It is a small form ; the calices are about 

 the same size as those of the larger variety, where, however, they 

 are closer together. 



This new species and its variety are closely allied to Stylophora 

 costulata, Edwards & Haime, from Gaas (Miocene), and less so to 

 Stylophora raristella (Dax and Turin). In some very large specimens 

 there are irregular gibbosities, like truncated shoots, from the main 

 stem ; and the Jamaican specimens often present this form of coral - 

 lum in small branches. The imperfect septal development and de- 

 fective costal arrangement distinguish the new species from S. costu- 

 lata, but still the alliance is very close. Apar^t from the form of the 

 coral, there is much resemblance to Stylophora palmata (recent, Red 

 Sea). The fossil forms are from La Palarea, Scinde, Biarritz, Dax, 

 Turin, Yienna, Belforte, and Gaas. 



20. Agaricia agaricites, Lamarck. 



Three fragments of one specimen are of this species, which now 

 exists in the American seas. The Coral is known under various 

 generic synonyms, such as Pavonia, Madrepora, &c. It is remarkable 

 that dissepiments clearly exist in the interseptal loculi of these speci- 

 mens, as well as synajjticulae. 



From the Nivaje shale. Coll. Geol. Soc. 



21. Agaricia ttndata, Lamarck, var. 



A fragment imbedded in Nivaje shale, with pieces of one of the 

 Turbinolides and of a Stylophora. It is more closely identical with 

 A. undata than with any other form ; the slanting calices and the 

 inferior surface unequally costated are very characteristic of that 

 species. At the same time the specimen has more septa and closer 

 " collines " than the typical A. undata, and it presents many resem- 

 blances to forms of the genus Mycedia. Both Agaricia and Mycedia 

 are found in the existing American seas. 



From the Nivaje shale. Coll. Geol. Soc. 



22. Alveopora fenestrata, Dana. 



This fossil is from the Heneken Collection, and coincides with the 

 description of A. fenestrata by Edwards and Haime (see descriptions 

 of fossil Alveopora? from Antigua and Jamaica, pp. 426 & 442). 



From the Nivaje shale. Coll. Geol. Soc. 



23. Porites Collegniana, Michelin. 



Occurs in the Nivaje shale in a Coral-breccia. Coll. Geol. Soc. 

 It is also found in the Yienna Basin (Beuss) . 



III. Jamaica. 



1. Placocyathtjs Barretti, spec. nov. PI. XYI. figs. 1 a-1 c. 



Corallum simple, elongated, greatly compressed, the small axis of 

 the calice being to the large as 100 to 366 ; conical and pedunculated, 



