EEPORT ON CORALS — DEEP-SEA MADREPORARIA. 



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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 costae the wall of the calicle presents five 

 faces almost flat, but with slightly marked secondary costae. The septa are in five 

 systems and four cycles ; they consist of extremely fragile laminae covered with granules 



Flahellum 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 Pourtales has 

 received from the " Blake" dredgings a specimen with six systems, but which otherwise 

 agrees with the present. 1 



Extreme breadth of the calicle, 24 - 5 mm. Extreme height, -11 mm. 



Station 50, off Nova Scotia. 1250 fathoms. 



Flahellum conuis, n. sp. (PI. VII. figs. 6, 6a, 6b). 



The corallum is light, thin, and fragile, and of a veiy pale pink colour. It is conical 

 in form, slightly 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 

 lines. The primary and secondary costae 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 slightly hollowed out ; 

 there are no costae of lower order. The mouth of the calicle is oval in outline, with a 



1 Pourtales, Bull. JIus. Comp. Zool., Harvard, No. 9, vol. v. p. 203. 



