86 PALAEOZOIC CORALS AND FORAMINIFERA. 



constantly distinguished by the smaller size of the stars, fewer 

 radiating lamellse, and more open internal vesicular structure. 



Forms large masses in the carboniferous limestone of Kendal. 



{Col. University of Cambridge.) 



Nemaphyllum decipiens (M^Coy). 



Sp. Char. Weathered surface having the stars undefined, the 

 lamellae of the outer area of adjoining cells appearing conti- 

 nuous, and forming a flat surface, in which the inner area of 

 each star forms a deep cylindrical cell \~ line in diameter, and 

 about their own diameter apart ; in the bottom of those cells 

 the lamellae rise to form a little cone, from the apex of which 

 projects (when well-preserved) the long thin flat axis, rising to 

 the level of the outer area ; on the polished transverse section 

 the stars are perfectly defined by distinct walls four- to six- 

 angled, 2 to 3 lines in diameter, with a flat central axis half a 

 line wide, and show the circular germs of young columns in 

 the corners of some of the old stars ; radiating lamellae thin, 

 about thirty-four, of equal thickness, one half reaching the 

 centre, the other barely touching the inner area, which forms 

 a circle about 1^ line in diameter ; the radiating plates are 

 connected by numerous curved vesicular plates in the outer 

 area, but few or none are visible in the inner area : vertical 

 section, axis thin, solid ; inner area of small, curved, vesicular 

 plates extending obliquely downwards and outwards from the 

 axis, about two or three cells in a row ; outer area separated 

 from the inner by a thin vertical line, it is composed of small 

 curved vesicular plates, in rows inclining obliquely upwards and 

 outwards, about four cells in a row. 



The flat broad spaces between the cups, the seeming continuity 

 of the radiating lamellae of adjoining stars, and the apparent want 

 of divisional walls between those latter, give the weathered sur- 

 face of this coral much the aspect of the so-called Astraa Hennahii 

 (Lonsd.) of the Devonian rocks ; but it is clearly distinguished by 

 the divisional walls appearing distinctly in the horizontal sections, 

 and by the flat, nearly solid axis, which is very obvious both in 

 the polished section and weathered stars. 



Not uncommon in the carboniferous limestone of Derbyshire. 



[Col. University of Cambridge.) 



Nemaphyllum clisioides (M^Coy). 



Sp. Char. Stars generally hexagonal and averaging 2 lines in 

 diameter : weathered surface, stars defined by a rather thick, 

 prominent, crenulated divisional wall ; outer area inclined down- 

 wards and inwards to form a shallow cup, in the middle of 

 which the inner area rises into a conical tent-like boss having 



