14 Mr. F. M‘Coy on some new genera and species of 
In general appearance this resembles the L. duplicata (Mart. 
sp.), but is much more rugose, and the young branches expand 
more rapidly ; in the vertical section it is distinguished by the 
central line and the undefined sides of the axis, as well as the very 
much smaller size of the cells of the vesicular structure, and the 
much greater number of the radiating lamelle, which do not ex- 
ceed twenty-four or twenty-six in that species. There isa slight 
external resemblance between this coral and the Cyathophyllum 
pseudo-vermiculare (M‘Coy), but the prominent axis easily di- 
stinguishes it. | 
Common in the carboniferous limestone of Corwen. 
(Col. University of Cambridge.) 
Lonsdaleia? stylastreaformis (M‘Coy). 
Sp. Char. Corallum composed of easily separable (four- to six- 
sided) prismatic tubes from 3 to 5 lines in diameter; outer 
walls faintly striated longitudinally, and marked with arched, 
transverse, imbricating rugosities : vertical section, axis large, 
defined, composed of irregular, spirally complicated lamellee ; 
inner area of little-curved, vesicular plates, inclining obliquely 
upwards and outwards, each plate generally extending from 
the axis to the circumference of the mner zone, so that there 
is but one, or occasionally two lengthened cells in a row be- 
tween those points; outer area narrow, composed of slightly 
arched plates inclining obliquely upwards and outwards, each 
plate usually reaching from the inner zone to the outer wall; — 
more rarely a second arched plate is required, so that gene- 
rally there is but a single row of long cells between the mner 
zone and outer wall, with occasionally a small irregular cell 
towards the margin : transverse polished section showing a large 
-oval or circular, regularly reticulated or cellular axis, from 
which twenty-five lamellz of equal length and thickness ra- 
diate almost to the outer walls, the cellular lining of the walls 
free of radiating lamelle being very narrow, and forming ap- 
parently a single row of irregular cells; the spaces between 
the radiating lamelle crossed by very thin arched plates ; 
transverse rough fracture generally cup-like above, the outer 
zone forming an oblique, nearly uniform margin, faintly un- 
dulated in a radiating direction, within which is the rough flat 
fracture of the inner zone and axis; on the under side the po- 
sition of those parts is reversed, the inner area being promi- — 
nent and surrounded by a narrow, radiated border sloping to 
the walls. 
This coral is very remarkable for uniting in itself the internal 
structure of Strombodes (Lithostrotion, Lonsd.) with the external 
form and easily-separable columns of the Stylastrea of the same 
Vn) 
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