Paleozoic Corals and Foraminifera. 17 
in an oblique line from the axis to the wall of the inner area ; 
outer area’ separated from the inner by a sharp distinct line 
on each side, and composed of much smaller and more highly 
curved vesicular plates, so that there are from five to seven 
small, nearly equal, rounded cells extending in a line obliquely 
upwards and outwards from the inner area to the outer walls 
of the tube: horizontal section, boundary or divisional walls 
thin, stars radiated with from fifty to fifty-five very thin lamelle, 
of equal thickness, but alternately long and short, the long 
reaching to the centre, the short barely entering the edge of 
the inner area: weathered surface, stars flattened, separated 
by a depressed line ; inner area forming a gently convex oval 
or circular boss, with the axis forming a short impressed line 
in the middle ; the radiating lamellee exhibit numerous delicate 
curved interstitial plates in the outer area, but none in the 
inner area. 
This beautifully delicate species is the largest of the genus Iam _. 
acquainted with, the usual width of the stars being about 7 lines, 
diameter of the inner area about 24 lines. It very frequently 
exhibits the young oval buds within the corners of the old stars, 
generally but one, very rarely two in a star. 
pore large masses in the carboniferous limestone of Derby- 
shire 
(Col. University of Cambridge.) 
Nemaphyllum minus (M‘Coy). 
Sp. Char. Stars having from four to seven angles and averaging 
from 3 to 4 lines in diameter; axis thin, about 3ths of a line 
wide : vertical section, inner area slightly wider than the outer 
on each side, composed of slightly curved vesicular plates ex- 
tending 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 cells in each oblique row 
between those points; outer area of smaller and more curved 
plates, forming smaller, more regular and rounded cells dis- 
posed 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, separated by impressed lines, inner 
area forming a large convex oval or circular boss in the middle 
of the star and having the axis in the centre ; radiating lamelle 
forty-five, thin, 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 be- 
tween the lamelle in the outer zone, not visible in the inner 
one. 
This species is allied to the N. arachnoideum sae but is 
Ann. & Mag. N. Hist. Ser. 2. Vol. iii. 
