MADREPORARIA OF THE DEEP SEA. 335 
‘Deep-sea Corals,’ No. 4, Illustrated Catalogue, &c., 1871, of this coral, has enabled 
me to place it amongst the fauna of the eastern Atlantic. 
Section RUGOSA. 
Family Cyathaxonide. 
Genus Guynta, Duncan. 
The corallum is simple and long. The wall is thick and solid. The septa are well 
developed, lamellar, unequal, and are continuous from the base to the calice. There 
are four systems of septa; and one primary septum is longer and larger than the others. 
The columella is essential, and is attached to the larger septa. 
There is no endotheca. 
The costz are visible on the growth-rings of the outside of the wall. There is an 
epitheca. 
GUYNIA ANNULATA, spec. nov. (Plate XLVII. figs. 9-16.) 
The corallum is long, cylindrical, and narrow. It is sometimes curved. The accretion- 
ridges are well developed and regular, and are marked with prominent short spinicles, 
lamin, or granules, which correspond with the coste. The epitheca which ornaments 
the ridges is delicate. The coste extend over the whole length of the corallum, and 
usually exist as flat bands between the close and rather wavy accretion-ridges. There 
are four principal septa, one of which is larger than the others, at the calice. The four 
secondary septa are often as large as the primary; but the eight tertiary septa are almost 
rudimentary. There are four systems of septa and three cycles in each. None are 
exsert. The columella is stout, cylindrical, deeply seated in the calice, and adheres to 
the larger septa. The interseptal loculi are large; and the transverse outline of the 
corallum is sometimes rather angular. The length of the perfect corallum probably 
2 inch, the breadth 35 inch. 
Locality: Adventure bank, in 92 fathoms. It is frequently found adherent by its 
side to shells and foreign bodies. 
Longitudinal sections prove the absence of endotheca. 
In three specimens there were evidences of an hexameral septal arrangement. One 
had the octomeral at the base, but the hexameral at the calicular end. A transverse 
section midway showed the eight large septa; so that there must have been an arrest of 
development during growth, and the specimen illustrates the formation of the neozoic 
type from the rugose. A second specimen, when scraped down, showed the union of a 
septum with another; and as this occurred in two instances, seen in one and inferred in 
another, the arrest of development was accounted for. 
The interesting affinity of this form with the rugose coral Haplophyllia paradowa, 
VOL, VilIL—Part v. March, 1873. 3B 
