Paleozoic Corals and Foraminifera. 3 
a few faint extensions of the radiating lamelle, and divided 
into two symmetrical portions by a strong median fissure ; the 
space between this inner area and the outer wall is regularly 
radiated with from sixty-three to sixty-nine equal, thin, rather 
distant lamelle connected by numerous delicate, transverse, 
_ vesicular plates ; terminal cup deep, lined by the,vertical la- 
mellz, and having a large oval prominent boss in the centre 
traversed by a sharp mesial crest ; about one-half or one-third 
of the radiating lamelle ascend the central boss, always in a 
direct line, those at the sides of the mesial crest being at right 
angles to it, the others joining at a more acute angle as they 
approach the extremity, aud opposite one end of the crest we 
generally observe one or two of the radiating lamelle shorter 
than the rest, producing a sort of siphon-lke irregularity such 
as we see in Caninia: vertical section indistinctly triareal ; 
outer area defined, about one-sixth of the width on each side, 
composed of small, much-curved, vesicular plates, forming 
small semicircular cells arranged in very oblique rows upwards 
and outwards, about seven in a row; inner zone about equal- 
ling the outer one in width, passing gradually into the central 
structure, formed of slightly larger and less curved vesicular 
plates than the outer zone, and having a nearly horizontal di- 
rection ; central area composed of large, thin, close, little- 
curved, vesicular plates, forming a strongly arched series of 
narrow, elongate cells, the convexity of the arch upwards, con- 
forming to the shape of the central boss in the cup ; if the ver- 
tical section be at right angles to the medial fissure or crest of 
the central boss, there is a line visible down the middle of the 
section. 
This coral is interesting to the physiologist from the combi- 
nation of the bipartite or symmetrical with the radiated type of 
structure, as in some Fungiea, &c. It nearly equals the Caninia 
gigantea (Mich.) in size and cylindrical form, but is easily distin- 
guished by the strong longitudinal striz of the surface, the want 
- of transverse septa in the central area, &c. 
Rather common in the carboniferous limestone of Derbyshire. 
(Col. University of Cambridge.) 
Clisiophyllum prolapsum (M‘Coy). 
Sp. Char. Elongate-conic, much curved and twisted on its axis, 
terminal cell oblique, deep, with steep sides, a narrow flattened. 
or concave space at bottom, from which protrudes the central 
boss, which is about one-third the diameter of the cup, nearly 
as high as wide, cylindrical, obtusely rounded above, and with 
a deep umbilical cavity in the middle (in partially decomposed 
or weathered specimens a rough vertical fracture frequently 
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