1864.] DTJNCAN AND WALL JAMAICA. 11 



from eighteen to twenty in number ; six are continuons with the 

 large septa, and the rest taper finely internally and externally, the 

 spindle-shaped process being one-half septum and the rest costa. 

 The processes are close, radiate, and horizontal. Diameter of calices 

 •TO i^ch. 

 Localities : Bowden and Yere, Jamaica. 



16. Antillia Walli, spec. nov. PI. II. fig. 4a-c. 



The corallum is compressed laterally, and slightly curved inferiorly, 

 in the plane of the major axis ; it is much broader than long, has a 

 pedicel, and is indented anteriorly, but is convex posteriorly. The 

 pedicel is mammilliform and bluntly pointed, and the corallum ex- 

 pands rapidly above it on either side. 



The calice is elhptical, and has a sinuous margin. The wall is 

 very stout and appears to be double, the space between the true and 

 false wall being occupied by part of the septa and dissepiments. The 

 portions of septa between the walls are much thinner than their 

 continuations, and a dissepiment divides the space between the walls 

 into quadrangular cells. The inner wall is denser towards the base 

 of the corallum, and consists of endotheca. The costse are very 

 distinct where imcovered by epitheca, and diminish in width as they 

 approach the pedicel ; many are lost after passing downwards a 

 little distance, and all are marked by one series of distinct papillae 

 hardly amounting to dentations. The septa are numerous, crowded, 

 unequal, often curved ; and their inner margin is perpendicular, long, 

 and dentate. The laminae are slightly stouter internally than ex- 

 ternally, and are marked with radiating lines of papillae. There are 

 five cycles and a few septa of the sixth in six systems. The columella is 

 spongy, long, narrow, and deeply seated. The endotheca is abundant, 

 and the dissepiments are often incKned, especially when they form 

 the inner false wall. The exotheca is feebly developed ; the epitheca 

 is strong and membraniform. Length l-rV inch ; breadth -^o inch. 



Locality : Bowden, Jamaica. 



17. SiDERASTE^A CEENULATA, Blaiuville, sp. Var. Antillaetjm, 



nobis. 

 The remaining species have been described in a former communi- 

 cation*. 



5. Oeneral Remarks on the Affinities of the Species, and on the Corre- 

 lation of the Cretaceous, Eocene, and Miocene Strata of Jamaica 

 with those of Europe. 



The Cretaceous strata of Mount Hindmost and Trout Hall, in the 

 parish of Upper Clarendon, have afibrded numerous determinable 

 specimens of corals, a few of which cannot be specifically identified 

 with any forms already described. The majority have a very decided 

 facies. one which is famihar to the student of European Lower Cre- 

 taceous Zoantharia, and suggestive of a close alliance with the great 

 coral-fauna of Gosau in the eastern Alps. Heliastrcea exsadpta, Reuss, 

 * Quart. Journ. Geol. Soc. vol. xix. pp. 437, 513. 



