CORALS FROM THE CORAL RAG. 89 
swellings of the walls. As to Lithodendron subdichotomum,' Calamophyllia simplex, and 
C. Bernardana,®’ and Lithodendron Moreausiacum,’ which we are inclined to refer to the 
same genus, we are not sufficiently well acquainted with them to be able to point out their 
characteristic features. 
Genus CALAMOPHYLLIA, (p. XXXill.) 
CaLAMOPHYLLIA StoxeEst. Plate XVI, figs. 1, la, 14, le, 1d. 
Corallum composite, fasciculate, and composed of very tall subcylindrical or sub- 
prismatic corallites, which present a considerable number of annular expansions. These 
circular ridges are placed at a short distance from each other, and appear to be formed 
by the inferior edge of a series of laminz lapping over each other. The corallites 
dichotomise at short distances, and under very acute angles; the new branches thus formed 
continue ascending parallel to each other, and are in general somewhat constricted 
immediately above the point of origin. The coste are quite straight, very delicate, and 
closely set, but separated by deep, well-marked, narrow furrows; they do not project much, 
and are composed of a series of granulations more or less confounded together (fig. 1a). 
In general they are all nearly of the same size; but in some parts they are alternately a 
little thicker. The form of the ca/ice is somewhat irregular (fig. 1c, 1d, le); it is seldom 
quite circular, and usually more or less oval or subpolygonal. The fossula is shallow, the 
columella null or rudimentary, and the septa numerous ; in the large calices there are about 
seventy of these radiate laminz, and we must, therefore, suppose that there are four 
complete cycla and a fifth eyclum incomplete; but it is very difficult to distinguish the 
different systems, and there exists, in all probability, much irregularity in their mode of 
growth. ‘The septa are very thin, broad, closely set, and exsert; their upper edge is 
shghtly arched and regularly crenulated (fig. 14), their sides granulated. Those of the 
first three cycla differ but little, and those of the fourth cyclum are also highly developed ; 
but those of the fifth cyclum are much smaller. A vertical section of one of these corallites 
shows that the laminz which form the septa are very cribrate, and by means of a horizontal 
section numerous small dissepiments are exposed to view ; there are seven or eight of these 
in each interseptal locule (fig. 1¢). 
The corallites are very tall—those figured in this work, although broken at the end, 
were from six to seven inches high, and in general about five or six lines in diameter. 
1 Lithodendron subdichotomum, Munster, Beitr. zur Petref., 4th part, tab. u, fig. 3. Rhabdophyllia? 
subdichotoma, Milne Edwards and J. Haime, Polyp. Paleeoz., &c., p. 83. 
2 D’Orbigny, Prod., v. ii, p. 32. 
3 Calamophyllia Bernardina, D’Orbigny, loc. cit., vol. ii, p. 32. 
* Michelin, Icon., tab. xxi, fig. 3. 
