Palaozoic Corals and Foraminifera. 19 



the small flattened axis in the centre : horizontal section, divi- 

 sional lines of the stars thin, straight ; axis thin, half a line 

 wide; radiating lamellae thirty-six, thin, one half extending in 

 a llexuous manner from the walls to the centre, the inter- 

 vening ones also flexuous but of irregular lengths, most of 

 them reaching half-way ; transverse vesicular plates very few 

 and delicate, if visible at all : vei'tical section, axis as in the 

 other species ; inner area very wide, of large, little-curved ve- 

 sicular plates, inclining obliquely downwards and outwards; 

 one or two lengthened irregular cells reach from the axis to the 

 outer area ; outer area very narrow, of small, much-curved ve- 

 sicular plates inclining very obliquely upwards and outwards, 

 forming minute rounded cells about two in a row. 



This species much resembles some of the massive Astrseoid 

 ClisiophyUice of Dana by the conical tent- like aspect of the inner 

 area within the cups or weathered terminal cells ; the distinct 

 flattened axis, resembling that of the other Nemaphyllics, will 

 however distinguish it. The flexuous character of the radiating 

 lamellae in the transverse polished section is remarkable. The 

 Astraa irregularis of PortlocVs ' Report on Londonderry, ^& c 

 which I know to be a true Nemaphyllum, resembles this species 

 in the small .size of the stars and flexuous lamellae, but is easily 

 distinguished by the cells being simply cup-shaped, descending 

 uninterruptedly from the walls to the small, flat, prominent axis 

 in the bottom of the cup, instead of the large tent-like boss 

 formed by the inner zone of the above. 



Forms irregular tuberose masses in the carboniferous limestone 

 of Derbyshire. 



{Col. University of Cambridge.) 



Nemaphyllum sepiosum (M^Coy). 



Sp. Char. Corallum of long, inseparable, slightly diverging five- 

 or six-angled tubes, with an average diameter of 5 lines : ?;^r- 

 tical section, axis straight, thin, flat, three-fourths of a line 

 wide; inner area composed of large, rather distant, slightly 

 arched plates, each of which generally extends across the en- 

 tire area, so that one lengthened cell (rarely more) reaches 

 from one side to the other of this area, having the axis in the 

 middle ; outer area broad, of numerous minute, much-arched 

 vesicular plates inclining obliquely upwards and outwards, 

 about four of the little cells in the oblique line from the inner 

 area to the outer wall : transverse rough fracture showing the 

 inner area to be composed of slightly conical or cup-shaped 

 plates, their diameter equal to that of the area, and pierced in 

 the centre by the flat persistent axis : polished trarisverse sec- 



2* 



