432 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 6, 



in six syscems of four cycles, generally incomplete in some half- 

 systems. The primary septa are the largest ; the fourth and fifth 

 orders are very small. Columella rudimentary. Costae very marked, 

 subplane, alternately large and small, reaching down the trunk ; near 

 the calices they are marked by a series of distant papillary elevations, 

 with a small and superficial foramen at their apices. Height of 

 corallum 2 inches ; small diameter of calices -| inch. 



This species is closely allied to Barysmilia tuberosa, Peuss, from 

 Gosau, and the genus has not hitherto been noticed out of the Creta- 

 ceous group. 



From the shale at Esperanza, San Domingo. Coll. Geol. Soc. 



9. Dichoccenia tuberosa, spec, nov. PI. XV. figs. 5 a, 5 b. 



Corallum tuber-shaped, with a circular or oval eroded base, and a 

 more or less gibbous surface, covered with a delicate epitheca and 

 numerous calices. Calices numerous, rather close, decidedly promi- 

 nent, the lower edge generally longer than the upper. The calices 

 look generally upwards and outwards ; they are either circular and 

 small or elliptical and larger ; in the largest form, series of two or 

 three are produced in the process of fissiparous reproduction. The 

 long axes of the calices point in all directions ; some small calices 

 are hidden by the epitheca. Costae well marked on the calice, but 

 becoming granular and slightly spined on the surface of the Coral : a 

 shagreen-looking epitheca, which, when broken, shows linear costae 

 beneath, separates the calices. The costal markings on the epi- 

 theca are now and then continuous from one calice to another, and 

 from calices to the base. Septa in six systems ; four cycles in some 

 systems, three in others ; the fourth orders are often wanting. They 

 are delicate, a little larger at the wall than elsewhere, and faintly 

 granular. Columella laminar, parietal, or spongy in different calices. 

 Pali exist very irregularly ; they are placed very constantly before 

 the secondary septa, but are often not seen at all. Calicular fossa? 

 tolerably deep. Diameter of the calices y 3 ^, -|, to -| inch. The Coral 

 is generally some inches high, and bulky. 



No fossil species of this genus have been described, except a doubt- 

 ful form, to which Milne-Edwards gives a Lower Cretaceous age. 



Erom the Nivaje shale and tufaceous limestone of San Domingo. 

 Coll. Geol. Soc. and Brit. Mus. 



10. Stephanoccenia dejstdroidea, Edwards & Haime, Hist. Nat. des 

 Polyp. &c, p. 169. 



Edwards and Haime give no habitat for this form ; but the ramose 

 species of JStephanoccenia, common in the Miocene of San Domingo, 

 is evidently the same. 



11. Phyllocxenia sculpta, Edwards & Haime, var. tegtjla. 



Astrcea sculpta, Michelin. 



A thin, flat, tile-shaped Coral from San Domingo corresponds with 

 the Astrcea sculpta, Michelin (the Phylloccenia sculpta, Edwards & 

 Haime), in the majority of its details. The costae are not so decidedly 



