128 DESCRIPTION OF CORALS. 
fifty and sixty ribs or striz, the interpolations being very irregular, and the range 
of the longest being slightly affected to admit them. The interspaces between the 
ribs were necessarily narrow, and the ‘ pores” or cross-processes were difficult 
to detect, but chiefly on account of irremoveable matrix: where the groove had 
been cleared, the bars were perfectly distinct, but simple, with quadrangular 
hollows between them, totally unlike the equivalent structure in the true Turb. 
sulcata. The terminal star differed also markedly from that of the species just 
mentioned. There was not a perfect agreement in position between the lamellz 
and ribs, the former amounting to about thirty, the latter to between fifty and 
sixty ; and a similar want of concord is deducible from M. De France’s num- 
bers. The star, therefore, instead of exhibiting a very definite wheel-like com- 
position, with a simple periphery, displayed analogous rays or spokes, with 
a thin, crenulated boundary-margin. Other peculiarities were observed, but 
they do not demand attention in this notice. Slightly worn specimens, firmly 
beset with matrix, agreed very nearly with the figure of Turb. dispar given by 
M. Michelin (Iconog. pl. 43. f. 5). From these differential characters, therefore, 
it is inferred that two species of Turbinolie occur in the same or equivalent 
strata, resembling in general characters, but varying in details of structure, one 
of them being certainly Turb. sulcata, and the other believed to be Turb. dispar. 
Family OceLiina. 
Oculina raristella, De France. (Tab. I. fig. 2.) 
Incrusting, expanded, lobed or branched ; stellular tubes, sometimes distant, 
sometimes aggregated, projecting or immersed ; lamellz 1% broad, 12 rudiment- 
ary in lower part of tubes, more numerous in upper part, sides hispid, outer edge 
not connected structurally with surrounding composition, inner edge blended 
with central reticulation, plates seldom united in range towards the centre, often 
contorted ; central area relatively large, formed of reticulated and foraminated 
plates, boundary-wall hispid on the inner surface, separable from investing 
structure ; terminal cup deep, lined by very narrow, hispid and jagged lamellz, 
centre projecting points or edges of reticulated plates, margin of cup sharp, 
crossed by the lamellz ; intertubular substance compact in more advanced states, 
in younger, traces of a close reticulation, traversed in both stages by innumerable 
microscopic tubuli, exterior surface more or less covered with tubercles, often 
