CORALS OF THE CRAG. 7 
epitheca ; their upper edge is slightly smuous, and their surface covered with projecting 
granule of various sizes, disposed rather irregularly in rows nearly parallel to the upper 
edge. These granule are much larger along the inner and inferior part of the edge of 
the septa of the superior orders, where they assume the appearance of alternate trabicule 
or spines. It is also to be noted that the principal septa are slightly emarginated near 
the border of the calice, and that their free edge is thin and arched above, thick, 
subflexuous, and obliquely truncate towards the columella. A horizontal section of the 
corallum, made a little below the edge of the calice, shows the thickness of the walls, 
and of the imner part of the large septa; it also renders evident the bifoliate structure of 
these septa. Height twelve lines; long axis of the calice from twelve to sixteen lines ; 
the short axis from four to six lines. 
The genus Flabellum contains a great number of species, and has been subdivided 
into three sections, according to the state of the basis of the corallum, which is sometimes 
pedicellate or truncate, and in others widely adherent. The HMadbellum Woodii is easily 
distinguished from the fixed Madbel/um and the truncated Fabellum, by the permanence of its 
narrow peduncle, and differs from most of the pedicellated F/adella by its simple non- 
cristate, non-spimous cost. Seven species, /. Gallapagense, F. Michelinii, FP. Thouarsii, 
F. cuneatum, PF. subturbinatum, F. majus, and F. Sinense, have the same character ; but 
F. subturbinatum and FP, Michelinit are recognisable by their horizontal calice and their 
lateral costa, almost vertical. /. Gallapagense also resembles FP. Woodii by the rudimentary 
state of its columella, but is of a more elongated form, and is much less compressed laterally. 
F. cuneatum and F. majus are still nearer allied to F. Woodii, their characters, however, 
are not yet completely known; but the first of these fossil species has the septa much 
thicker than in the above-described Coral, and FVabellum majus is remarkable by its great 
size, its highly-compressed calice, and the peculiar structure of its principal septa." 
The Madsellum Woodii has been found in the Coralline Crag at Iken, and appears to be 
very rare; for in 1844, when Mr. Searles Wood published his ‘Catalogue of the Zoophytes 
of the Crag,’ only two specimens, one belonging to Mr. Bunbury, and the other to Mr. W. 
Colchester, were known, and we believe that since that time only two more specimens, 
now in the possession of Mr. Searles Wood, have been found. ‘Those figured and 
described im this Monograph were communicated to us by Mr. Searles Wood. 
! See our Monograph of Turbinolidee, loe. cit., p. 260. 
