Zoopuyra. | UPPER PALZOZOIC RADIATA. 99 
of one star magnified three diameters, shewing the flat axis, the flexuous radiating lamellee, and the few 
rows of vesicular plates of the outer area. 
NEMATOPHYLLUM DECIPIENS (J/*Coy). Not figured. 
Ref.—M°Coy, Ann. Nat. Hist. 2nd Series, Vol. IIT. p. 18. 
Sp. Ch.—Weathered surface having the stars undefined, the lamelle of the outer area of adjoining 
cells appearing continuous, and forming a flat surface, in which the inner area of each star forms a deep 
cylindrical cell one and half lines in diameter, and about their own diameter apart ; in the bottom of 
these cells the lamelle 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, two to three lines in diameter, with a flat central axis half 
a line wide, and shew the circular germs of young columns in the corners of some of the old stars; radiating 
lamelle thin, about thirty-four, of equal thickness, one-half reaching the centre, the other barely touching the 
inner area, which forms a circle about one and half lines 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 out- 
wards 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 lamelle of adjoining 
stars, and the apparent want of divisional walls between these latter, give the weathered surface of this coral 
much the aspect of the so called Astrea Hennahi (Lonsd.) of the Devonian rocks; but it is clearly dis- 
tinguished 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. 
Position and Locality—Not uncommon in the carboniferous limestone of Derbyshire. 
NEMATOPHYLLUM MINUS (J/‘Coy). PI. 3. B. fig. 3. 
Ref —MCoy, Ann. Nat. Hist. 2nd Series, Vol. III. p. 17. 
Sp. Ch.—Stars having from four to seven angles, and averaging from three to four lines in diameter; 
axis thin, about three-fourths of a line wide; vertical section, inner area slightly wider than the outer on 
each side, composed of but slightly-curved vesicular plates extending obliquely downwards and outwards, 
each one nearly reaching from the axis to the external boundary of the inner area, forming thus but one 
or two elongate cells in each oblique row between these points; outer area of much smaller and more 
curved plates, forming smaller, more regular and rounded cells, disposed in indistinct rows obliquely upwards 
and outwards, about four in a row from the inner area to the outer wall; weathered surface, stars nearly 
flat, inner area forming a large convex oyal or circular boss in the middle of the star, and having the 
axis in the centre; horizontal section, axis, and forty-five to fifty-three, thin, radiating lamell, of equal 
thickness, one half of them reaching the centre, the intermediate ones entering but a short way into the 
inner zone; numerous small, curved, interstitial plates between the lamellee in the outer zone, (four or five 
rows), not visible in the inner one. 
In all our weathered specimens the solid axis and divisional walls appear sunk below the level of the 
rest of the star, giving the idea that the mineral matter of the matrix having at first penetrated the 
vesicular tissues of the more delicate parts of the star, tended to their ultimate preservation, while the 
originally thicker portions of solid coral, being now unprotected, decay more rapidly. 
This species is allied to the NV. arachnoideum (M*Coy), but is constantly distinguished by the smaller size 
of the stars, lamellee, and more open internal vesicular structure. 
02 
