MADREPORARIA OF THE DEEP SEA. 243 
not bilobed, but ragged on their inner margin; and the largest are before the tertiary 
septa. There are four cycles of septa, and many members of the order of the fifth 
cycle. 
Height of corallum 4 inch; breadth of calice 38; inch. 
Mediterranean. Coral zone. 
Genus FLABELLUM. 
FLABELLUM MINUS, sp. noy. (Plate XLV. figs. 10-13.) 
The corallum has a distinct base of attachment and is cylindro-conical and compressed 
superiorly. The epitheca is well developed, and is marked by close curved lines in 
festoons, which meet along longitudinal linear grooves that correspond with the inter- 
laminar space of each septum. The calice is elliptical, not deep, and the margin is 
sharp and thin. There are 16 septa, there being six primaries, six secondaries, and 
the tertiaries only developed in four half systems at the opposite ends of the long axis. 
The septa are wide apart, thin, granular, and slightly exsert. 
The height of the corallum is 3%, and breadth of calice 3%5 inch. 
Locality: 2nd exped. ‘ Porcupine,’ 996 fathoms, No. 16 dredging. 
This small Flabellum may not be full-grown; but its broad base (for its size) larger 
than that of the full-grown specimens of Flabellum distinctum, and its low septal 
number, when of the same size as the young of that species, indicate a satisfactory 
specific difference. 
The species has some structural resemblance to Flabellum woodsi of the Crag, espe- 
cially in the lines on the outside, which corresponds with the middle of the septa; but 
probably its nearest ally is Flabellum siciliense, Ed. & H., of the Sicilian Tertiaries. 
Genus GEMMULATROCHUS, gen. nov. 
The corallum is compound, is fixed by a broadish base, and is conico-cylindrical in 
shape. The wall is thick; and there is a well-marked epitheca, the coste being rarely 
visible. The calice is very deep; and there is a rudimentary columella. The septa are 
stout. Budding takes place from the wall high up; and the buds ascend and fre- 
quently join by their walls to others of different corallites, so as to constitute a bush- 
shaped corallum. 
GEMMULATROCHUS SIMPLEX, spec. nov. (Plate XLV. figs. 18-20.) 
The parent corallite bears buds on opposite sides; it has a slight constriction above 
the base of attachment, a well-developed epitheca, and a rather elliptical calice. The 
septa are distinct, stout, granular, and short, not reaching far inwards; there are six 
systems; and the fourth cycle is incomplete in all but one. The primaries are the 
VOL. X.—Part y. No. 2.—March 1st, 1878. 2M 
