106 BRITISH PALASOZOIC FOSSILS. [Zoopuyva. 
and the much greater number of the radiating Jamellze, which do not exceed twenty-four or twenty-six in that 
species. There is a slight external resemblance between this coral and the Cyathophyllum pseudo-vermiculare 
(M°Coy), but the prominent axis easily distinguishes it. 
Position and Locality—Common in the carboniferous limestone of Corwen. 
Explanation of Figures—P1. 3. B. Fig. 6. Old branch, natural size, shewing the concentric irregularities 
produced by the periodic death and continued growth of the main stem, and the mode of growth of the young 
slender stems.—Fig. 6 a. Do. Young, perfect, terminal cells, shewing the very prominent axis in the deep 
sharp-edged cup.—Fig. 6 6. Do. Vertical section, magnified three diameters, shewing the solid line down 
the middle of the conical axis, the very oblique close cellular structure of the axis graduating to the more 
open and less inclined cells of the inner area, the divisional line and small rounded cells of the outer area; 
the top shews a profile of the terminal cup and the extension of the lamelle, with their connecting plates. 
—Fig. 6c. Do. Horizontal section, magnified two diameters, shewing the nearly equal radiating lamellze 
delicately prolonged to the walls, supported by the strong circle of vesicular plates surrounding the inner 
area. 
LoNSDALEIA STYLASTRAIFORMIS (M°Coy). PI. 3. B. fig. 7. 
Ref —M°Coy, Ann. Nat. Hist. 2nd Series, Vol. III. p. 14. 
Sp. Ch.—Corallum of easily separable (four to six-sided) prismatic tubes, from three to five 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 lamelle ; inner area, 
of little-curved, vesicular plates, inclining obliquely upwards and outwards, each plate generally extending from 
the axis to the circumference of the inner zone, so that there is but one, or occasionally two, lengthened cells in 
a row between these points ; owter 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 generally there is but a single row of cells between the inner zone and outer wall, 
with occasionally a small irregular cell towards the margin; transverse polished section, shewing a large oval 
or circular, irregularly reticulated or cellular axis, from which twenty-five lamellee, of equal length and thickness, 
radiate almost to the outer walls; the cellular part of the walls, free of radiating lamelle, being very narrow, 
and forming apparently a single row of irregular cells, sometimes absent in part of the circumference, in which 
ease the radiating lamelle reach the walls; 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 undulated in a radiating direction, within which is the rough flat fracture of the inner 
zone and axis; on the under side the position of these parts is reversed, the inner area being prominent 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 writer. I am unable 
to afford any information on what would, under the circumstance, be the most interesting point, namely, 
the mode of production of new columns: taking all circumstances into consideration, I suspect the mode of 
increase was similar to that I have described in Lonsdaleia generally, the external prismatic form (which 
is of itself of no value) being produced by the pressure of a closer mode of growth than in the L. duplicata. 
As it is impossible to conceive a Strombodes (or Lithostrotion) splitting into easily-separable cola I pro- 
visionally, therefore, place it in Lonsdaleia. : 
Position and Locality—Rare in the carboniferous limestone of Kendal, Westmoreland. 
Explanation of Figures.—P). 3. B. Fig. 7. One detached column, natural size.—Fig. 7 a. Do. 
Vertical polished section magnified three diameters, shewing the characters of the axis and the two areas, 
the upper part is a rough transverse fracture, shewing the oblique undulated outer area and a horizontal fracture 
of the axis and lamelliferous area.—Fig. 74. Do. Horizontal section magnified two diameters, shewing the 
occasional unradiated portion of the outer area in half of the circumference. 
