414 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Ceratopora, gen. nov. 
(Ety.: Kepas = a horn, 7rdpos — pore.) 
Description. Corallum compound, increasing by lateral gemina¬ 
tion ; erect or prostrate, seldom attached above the base. Septa 
represented by costae and by spinous trabeculae projecting from 
the inner walls. Calyx deep, funnel-form, thin walled, and con¬ 
tinued downwards in a narrowing tube, formed by the thickening 
of the walls through the addition, internally, of concentric layers 
of sclerenchyma and the formation of coarse cysts. Tabulae absent. 
Surface formed by a wrinkled epitheca. 
Type. Ceratopora jacksoni, sp. nov. 
Range and distribution. This genus is at present known from 
the middle Devonian, Hamilton group, of western New York 
and the Falls of the Ohio. 
Ceratopora differs strikingly from other Palaeozoic corals, except 
Monilopora, with which it agrees in the open character of its vis¬ 
ceral cavities, in the presence of trabeculae, and in the manner 
of thickening the walls by concentric additions of sclerenchyma 
from within. It differs from Monilopora in the absence of reticu¬ 
late structure in the walls, and in the presence of very coarse cysts. 
These latter, as seen in cross-section (PI. 2, figs. 7-12) are formed by 
successively added layers of sclerenchyma, the later-formed layers 
overlapping the earlier. Sometimes a single cyst occupies more 
than half the circumference of the corallite, but this is not frequent. 
The cysts are usually long, as shown in the longitudinal sections 
(PI. 2, figs. 7 and 11). 
The trabeculae are of the nature of gently tapering spines, pro¬ 
jecting from the inner surfaces of. the lamellae into the free spaces. 
In well-preserved specimens, the inner walls of the calices and vis¬ 
ceral cavities are seen to be thickly studded with these spines, which 
project at right angles from the walls. In form, they are slender, 
conico-cylindrical, broad at the base and tapering at first rapidly, 
and then move gently to a point. In a number of silicified speci¬ 
mens of C. dichotoma and C. distorta from western New York, 
the trabeculae appear as hollow tubuli, and where they have been 
destroyed, a series of pores marks their former position (PI. 3, 
figs. 11, 14, 15). 
The hollow character of the trabeculae in the silicified specimens 
