110 BRITISH PALAOZOIC FOSSILS. [Zoopuyta. 
This is more slender in form than the C. mitratum (Schl. sp.) or C. cornu-copiw (Mich.), and from which, 
andall the other turbinate corals of the palzeozoie rocks, it is distinguished, externally, by the strong, distinct, 
distant, longitudinal ridges; the internal characters approximate it only to the Cyathawonia cornu (Mich.), 
from which it is distinguished by its simple, few and thick lamelle, and thick axis, as well as more tur- 
binate form. 
Position and Locality —Rare in the carboniferous limestone of Derbyshire. 
Explanation of Figures.—PI. 3. C. fig. 3. Natural size.—Fig.2@. Do. Vertical and horizontal section 
magnified two diameters; the former shewing the thick solid axis and very loose vesicular structure, of thin 
slightly curved plates, converging upwards to the axis; the latter shewing the thick radiating lamelle connected 
by the thin edges of the vesicular plates. 
Genus. SARCINULA. See page 36. 
SarcinuLa Puiwurpsir (J/°Coy). 
Ref.—M ‘Coy, Ann. Nat. Hist. 2nd Series, Vol. III. p. 125. 
Phill. Pal. Foss. f. 15. D. 
I have given the above name, provisionally, to a coral which I believe to be identical with the Flintshire 
one figured as above, by Prof. Phillips, but not named nor described. It is closely allied to the C. placenta, 
but is of a thicker growth, the tubes are one-third larger, usually less than their diameter apart, and surrounded 
by thirty-two to forty strong radiating lamellee extending to the adjoining tubes; there is an obvious tendency 
in the middle of the transverse diaphrams to extend upwards, to form an irregularly compressed solid axis, 
often visible in the weathered cups. 
Position and Locality—Common in the carboniferous limestone of Corwen. 
SARCINULA PLACENTA (M°Coy). Pl. 3. B. fig. 9. 
Ref —M°Coy, Ann. Nat. Hist. 2nd Series, Vol. III. p. 124. 
Sp. Ch.—Corallum forming tabular masses, about one inch thick; under side with a thin epitheca, 
marked by small, concentric, imbricating undulations of growth, and radiating seratch-like striz ; the upper 
and lower surfaces parallel and flat; composed of vertical cylindrical tubes, forming circular cells at the 
surface, one line in diameter, and averaging about two lines apart; the intervening space being flat, cellular, 
and obscurely radiated on the weathered surface by about twenty-five curved radii; vertical section, tubes 
irregularly transversely septate by vesicular plates; spaces between the tubes composed of slightly-waved 
transverse rows of small, curved, vesicular plates, forming a nearly uniform minutely cellular structure ; 
horizontal section, tubes either plain or shewing more or less of the transverse vesicular plates; intervening 
spaces irregularly cellular, but shewing a slight disposition to form curved star-like lines round the tubes. 
This interesting coral bears a strong external resemblance to the Nematophyllum decipiens (M°Coy), 
but is distinguished by having no divisional lines between the stars in either section. 
Position and Locality—Rare in the carboniferous limestone of Derbyshire. 
Explanation of Figures.—P\. 3. B. fig. 9. Fragment natural size, shewing the lamellae passing from 
centre to centre on the flat upper surface, and the edge of the mass shewing the mode of weathering in 
horizontal laminze, the centres remaining as persistent cylinders, vertically striated by the radiating lamellae.— 
Fig. 9a. Do. Vertical section —Fig. 94. Do. Horizontal section, shewing the near equality in strength 
of the radiating and vesicular plates, and the consequent indistinctness of the radiation. 
SARCINULA TUBEROSA (M°Coy). PI. 3. B. fig. 8. 
Ref—M°Coy, Ann. Nat. Hist. 2nd Series, Vol. III. p. 124. 
Sp. Ch.—Corallum forming large shapeless masses, the upper surface covered with irregular tuberose 
projections, separated by flat or concave spaces, and each having a depressed tubular centre, one line in diameter, 
average distance between the centres five lines; from the margin of each centre about thirty slightly sigmoidal, 
