Palceozoic Corals and For aminif era. 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 lamellae, 

 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 lamellae 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 I am 

 acquainted with, the usual width of the stars being about 7 lines, 

 diameter of the inner area about 2| 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. 



Forms 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 fths 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 lamellae 

 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 lamellae in the outer zone, not visible in the inner 

 one. 

 This species is allied to the N. arachnoideum (M^Coy), but is 



Ann. ^ Mag. N. Hist. Ser. 2. Vol.'m. 2 



