DESCRIPTION OF CHALK CORALS. 323 
In the Eschara foliacea of the English coast, similar superpositions have been 
noticed as well as protuberances, but, as before stated, nothing of the kind has 
been observed among Flustre. Such occasional structures, however, cannot be 
regarded as essential characters, though their existence to a limited extent, and 
under certain conditions, as interference from extraneous bodies, or the form of 
the enveloped substance, would, if the conditions were more influential, give rise 
to the occurrence, in these and other genera likewise, of specimens in which over- 
lying layers would appear to be the true mode of development. In the Sicilian 
coral, to which M. Michelin’ has lately applied the term Eschara nobilis, identify- 
ing it with the Cellepora nobilis of Esper*, a series of complete envelopments is 
apparently an essential character; but the mode of incrusting is different, and 
must be studied in connection with all the component parts of the zoophyte, de- 
pending clearly, not on adventitious circumstances, but on the innate properties 
of the polype. 
ADDENDUM TO ANTHOZOA. 
Stephanophyllia Michelin, n.s. (Tab. XVIII. B. figs. 12, 12a, 12 b.) 
Very small, lamellz alternately simple and trifid at the extremity, upper sur- 
face regularly convex from centre to circumference, periphery composed of 
simple plates, terminations of the lamelle; under surface indistinctly radiated 
and foraminated. 
The genus Stephanophyllia® was established by M. Michelin for three tertiary 
corals found at Astesan and Tortone, one of which had been assigned to Fungia, 
and another to Turbinolia. From the former of those genera Stephanophyllia is 
stated to be distinguished by the grouping of the lamelle (Dict. Sc. Nat. Sup. 
loc. cit.) ; and there is apparently this difference from true Turbinolie, that the 
minor plates diverging from the extremities of the lamellz issue from the latter, 
and not from the periphery of the coral. The author of these memoranda is 
indebted to M. Michelin for specimens of Steph. elegans and S. Italica ; and a 
comparison of them with the minute chalk coral forming the subject of this 
notice, proved a perfect structural identity in generic essentials. Three speci- 
mens of the cretaceous species were procured many years since from a mass of 
Sussex or Hampshire chalk by wearing down the block with a soft brush under 
water, and then letting a stream from a cistern pour into the vessel till the water 
' [conographie Zoophyt. p. 329. pl. 79. f. 1 a, 1b, 1 e. * Pflanzenthiere, Cedlepora, tab. 7. 
* Dict. Se. Nat. Supplem. tome i. p. 484. (1841) ; and Icon. Zoophyt. p. 31-33, pl. 8. figs. 1, 2, 3. 
