Palceozoic Corals and Foraminifera, 129 



tions from thin short slender stems, this is one of the prettiest 

 species of the genus. It most resembles the C. tenuicollis (M'Coy) 

 figured in the 'Annals' for October 1847 (PI. XI. fig. 8), from 

 the carboniferous shales of New South Wales, but is distinguished 

 by its smaller size and much shorter necks to the cells, while, as 

 in that species, their small diameter compared with their cups 

 distinguishes it from the C, a-assa (M'Coy) of the carboniferous 

 slate of Ireland. 



Rare in the carboniferous limestone of Derbyshire. 



{Col. University of Cambridge.) 



{Madreporacea .) 



Dendropora megastoma (M'Coy). 



Sp. Char. Stem slightly flexuous, subquadrate, branches few, 



distant, resembling the main stem in size and shape, and 



toming off from it nearly at right angles ; each face has a row 



of large oval cells with prominent edges, the sides of which 



have twelve vertical sulci ending in tubercles ; the cells of each 



row are rather less than twice their diameter apart, the lateral 



rows opposite and alternating with the other two rows ; the 



width of the cells slightly exceeds that of the face on which they 



rest, so as to indent the margin ; interstices obscurely poroso- 



punctate ; width of stem about half a line. 



This beautiful coral is distinguished from the D. explicita 



yMich.) from the Devonian beds of Boulogne-sur-Mer by its 



smaller size and larger cells. Michelin, in his ' Iconographie 



Zoophytologique,' founds this genus from the last-named coral, 



and approximates it to the genera Criserpia and Aulopora ; the 



twelve sulci which I observe to the margin of the cells in this 



species however show that this cannot be the true affinity of the 



group, which must now rather be placed in the Madreporacea 



near Seriatopora. 



I have examined several specimens on a piece of carboniferous 

 limestone from Derbyshire. 



{Col. University of Cambridge.) 



Palceopora (M'Coy), n. g. 

 Gen. Char. Corallum polymorphous, generally subhemispherical 

 and concentrically ridged beneath, rarely branched ; formed of 

 cylindrical, distinctly walled, tubular cells, having internally 

 twelve vertical sulci or rudimentary lamellse, and divided at 

 irregular intervals by transverse diaphragms ; the tubes sur- 

 rounded and connected by a uniform minute network of small 

 vesicular plates. 



I propose this genus for all the so-called Porites of the palaeo- 

 zoic rocks. First described by Goldfuss as AstrcecB, they were re- 

 Ann. &: Mag. N. Hist. Ser. 2. Vol. iii. 9 



