CORALS FROM THE CORAL RAG. 93 
The branches are situated at a small distance apart, and very often they are arranged two 
by two opposite each other; they separate from the parent stem at an angle of about 50°, 
and grow to some distance in a straight direction before they begin to become erect. All 
are quite cylindrical, and the young ones are almost as thick as those of a superior order. 
The wal/s appear to be completely naked, and present closely set cost, which are narrow, 
delicately granulated, alternately small, or larger and more prominent, quite straight, and 
uninterrupted from the basis to the extremity of each branch, but becoming more developed 
near their upper end. The ca/ices are perfectly circular, and contain no columella; the 
principal septa meet in the centre of the visceral chamber, and become united together all 
along their inner edge, or by means of a few thick trabicule. There is no appearance of any 
pati. The septa are twenty-four in number, and therefore belong to three complete cycla ; 
but there are twice that number of coste ; the fourth cyclum of costs not having any 
corresponding septa on the inside of the wall. The septa are well developed, straight, and 
closely set. Those of the first cyclum are thick, especially near the wall; the secondary 
ones are almost as strong, but those of the third cyclum are thin; they are all but slightly 
granulose, and constitute almost perfect laminz ; there appears to be but very few dissepi- 
ments, and the walls are thick. The diameter of the branches varies between half a line 
and two lines and a half. 
This fossil is found at Steeple Ashton, and is in the collections of the Museum of 
Practical Geology, the Geological Society, the Cambridge Museum, Mr. Stokes, Mr. Pratt, 
and M. D’Archiac. M. Roemer mentions it as being met with also in the Coral Rag, at 
Speckenbrinke and Knebel, in Germany. 
The genus Goniocora, which we have established since the publication of the first part 
of this Monograph, is closely allied to Cladocora and Pleurocora (p. xxxviti), by its mode 
of generation, which always takes place by means of lateral gemmation, and not by fissi- 
parity, as in Calamophyllia, Rhabdophyllia, and Cladophyllia. t differs from the above- 
mentioned dendroid Astreine by the rudimentary state of the columella and the entire 
absence of pali. G@. socialis is the only well characterised species of this new generical 
division ; but we also refer to it a small fragment found in the trias of St. Cassian, and 
figured by Count Munster under the name of Lithodendron verticillatum. This imper- 
fectly known species differs from that here described by unequal size of the costa and the 
verticillate arrangement of the corallites. 
1 Beitr. zur Petref., part iv, tab. xi, fig, 22. 
