DESCRIPTION OF CORALS. 151 
which traversed a side obliquely were equally displayed in both the adjacent 
stars ; and without any visible coating, due to an independent lining in the polype- 
cavity. They were wholly situated towards the most developed side of the spe- 
cimen, and were all inclined in that direction, as if they had been affected by 
the cause which favoured the locally-prolonged growth of the columns. A 
somewhat similar parallelism of inclination was noticed in the French specimens 
(consult M. Michelin’s fig. 3 b. pl. 44. op. cit.). The only visible, perfect, lower 
termination within the body of the coral tapered gradually to a fine point, some 
of the ridges thinning off, and others extending to the extreme end. The apex 
or free portion was broken, but the preserved portion was about 3 lines in length ; 
and the inferior termination was nearly 2 lines from the longitudinal furrow or 
base of the adjacent columns. So far as the interior of the mounds could be 
ascertained, it consisted apparently of a union of the ridges with an intermediate 
filling up. 
No changes occurred in the lower part of the columns from additional animal 
secretions, the minute hispid points on the walls and the lamellz being perfectly 
sharp ; nor were any changes, dependent upon age, noticed in the upper part of 
the specimen. 
Not a trace of a subdivisional process was noticed, nor of a germ developed 
within the area of a mature column ; all the small or young stars appearing at 
the junction of three or more which were fully grown. They were not sur- 
rounded by mounds, nor raised above the general surface of the coral, but no 
doubt could be entertained of their interpolated position. In M. Michelin’s 
Paris basin specimens, young stars similarly situated were very numerous, and 
they exhibited most beautifully the delicate lamellae equally produced on every 
side of the individual star. 
Family CeLtierorina. 
Cellepora ? petiolus, sp. n. (Tab. I. fig. 10.) 
Disc-shaped, attached by a very short, cylindrical, hollow pedicle, situated on 
edge of disc; cells in opposite layers, no dorsal, intermediate lamina; rows in 
each layer radiating from centre, irregularly alternate ; form of cells globular, 
boundary a deep groove ; mouth large, round or oval; margin sharp or thick- 
ened; gemmuliferous? vesicles numerous, covering proximal portion of cell, 
large, semiglobular, affecting more or less size of cellular mouth ; opening into 
xen 
