1 i
margin of the oup, is 50 mm. ; the greatest diameter
of the calicle is 65 mm., and the smallest 30 mm.
The three specimens are very nearly of the same
dimensions.
The lateral costse make an angle with one another
of 120° to 140°, and are sharp and moderately prominent,
with an irregular edge. The external surface
of the calicle is covered with a glistering epitheca,
and near the margin is of a light pink colour. The
costae of the faces corresponding to the primary and
F ig . 12.—F l a h e l lu m a l a b a s t r u m , Mo s jk l e v . S l ig l i t ly e n l a r g e d . (No. 78.)
secondary septa are almost as well marked as the
lateral costae, and appear as irregularly dentated
ridges, separated by slight depressions. The ends
of the calicle are broadly rounded, and it is compressed
laterally in the centre. The upper margin is
curved, describing about one-third of a circle.
There are six systems of septa disposed in five
cycles. The septa are extremely thin and fragile.
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