REPORT ON CORALS—DEEP-SEA MADREPORARIA. 165 
glistening pellicular epitheca. The calicle is vase-shaped, widely open, the diverging 
walls making with one another an angle of about 110°. A short cylindrical pedicle is 
present. The mouth of the calicle is even and pentagonal in outline in the single 
specimen ; from each angle of the pentagon a stout costal ridge, very slightly dentate, 
runs down to the pedicle. Between these costee the wall of the calicle presents five 
faces almost flat, but with slightly marked secondary coste. The septa are in five 
systems and four cycles ; they consist of extremely fragile laminze covered with granules 
Flabellum angulare. Natural size. 
on their faces. The septa are complete, except the quaternary, which reach to a very 
short distance from the calicular margin. The columella is well developed and trabecular, 
formed of outgrowths of the inner ends of the septa; it is deeply placed in the calicle, 
the free vertical margins of the primary and secondary septa extending above it for a 
considerable height. 
The single specimen obtained is evidently abnormal in its arrangement in fives. This 
arrangement is in the specimen perfect ; there are exactly forty septa—ten primary and 
secondary in dimensions, ten tertiary, and twenty quaternary. Count Pourtalés has 
received from the “ Blake” dredgings a specimen with six systems, but which otherwise 
agrees with the present.’ 
Extreme breadth of the calicle, 24-5 mm. Extreme height, ‘11 mm. 
Station 50, off Nova Scotia. 1250 fathoms. 
Flabellum conuis, n. sp. (Pl. VIL. figs. 6, 6a, 6b). 
The corallum is light, thin, and fragile, and of a very pale pink colour. It is conical 
in form, shghtly compressed. The wall is covered with an opaque white epitheca to 
within a short distance from the margin of the calicle. The base is bluntly pointed 
without trace of adherence. It is marked with wavy transverse accretion ridges and 
lmes. The primary and secondary costze are slightly elevated broad ridges, broken here 
and there by the transverse accretion ridges; the primary are more prominent than the 
secondary. Between the costal ridges the surface of the wall is shghtly hollowed out ; 
there are no coste of lower order. The mouth of the ecalicle is oval in outline, with a 
1 Pourtales, Bull. Mus. Comp. Zool., Harvard, No. 9, vol. v. p. 203. 
