164 



PROT". P. MAUTIN" DUNCAN's EEVISION OF THE 



Grenus HxDis'OPnoEAEACiA, d' AcTiiardi, Corall. Eocenici del Friuli, 

 Pisa, 1875, p. 72, tav. xiii. figs. 3, 4, 5. 



Colony frondiform. Calices distributed over tlie upper surface 

 and having conical eminences between them. Septa confluent, 

 granular wbere free. Columella papillary. Synapticula well 

 developed. Base of colony ecbinulated and finely vermiculate. 



Distribution. — Fossil. Eocene : Europe. 



There is an undescribed genus, represented by two specimens 

 in the British Museum, in which the coUines are irregular, 

 longer than in the above, covered by close septa-costse. The 

 columella is styliform. Colony massive. It is clearly allied to 

 the above, but yet distinct. 



Grenus Coscinae^a, Milne-Fdwards ^ Jules Haime, Monogr. 

 des Poritides, p. 48 ; Compt. Bend. t. xxvii. p. 496 (1848); 

 amended ; Duncan.^ Journ. Linn. Soc, Zool. vol. xvii. p. 314 

 (1883). 



Colony massive, partly incrusting, convex above, with irregular- 

 shaped, rather deep calices in short series, with slightly project- 

 ing intermediate eminences. Calicular centres usually distinct ; 

 septa uniting with those of neighbouring calices and extending 

 over the eminences. Some septa are simple and others unite by 

 their sides with larger ones ; spinulose at the free edge, perforate 

 and trabecqlate, except near the solid basal wall, which is very thin 

 and costulate. Columella deep, small and papillary. Synapticula 

 more or less in vertical series, discontinuous and stout. No 

 walls between the calices. Gremmation between the calices, on 

 the eminences, and intervening spaces. 



Distribution. — Fossil. Cretaceous: India? — Becent. EedSea; 

 Mauritius ; Burmese seas. 



A careful examination of numerous specimens of species in 

 the British Museum and in my own collection, has not enabled 

 me to discover endothecal dissepiments. Milne-Edwards and 

 Jules Haime drew them, but Klunzinger's photographs do not 

 show them. Probably the stereoplasm-looking endotheca in 

 Milne-Edwards's plate is the result of irritation from parasitic 

 growth. The thin basal wall in the specimens from Mergui 

 resembles epitheca more than theca. 



