26 
CRETACEOUS CILIOEODA 
The Cerioporce, of which Goldfuss’ C. micropora from the Scnoiiien of Maas- 
tricht may he considered the type, arc exclusively found fossil, in Jurassic, creta- 
ceous and tertiary strata. It is usually stated that the colony consists of numerous 
superposed layers, hut this is, strictly speaking, not the case. The tuhular cells are 
continiious in each hranch, hut as they gradually, or at short intervals, increase in 
length all round on the sm*foce, and thus enlarge the mass of the colony, the 
different stages of growth on the respective levels attain a similarity to distinct 
layers, one incrusting the other, hut these two kinds of growth differ essentially 
from each other. The similarity hetween the stages of growth and the different 
layers is increased hy the circumstance, which occasionally happens, that the growth 
of certain portions of the colony are arrested, while others proceed in a regular Avay, 
hut they do not extend over the arrested parts of the colony. Defined in this 
manner, the genus Ceriopora must include many more species than were admitted 
to it hy d’Orhigny. 
1. Ceriopoba dispae, StoUczlm, PI. Ill, Eigs. 1-3. 
Cer. colonia repente, caispitosa vel ramosa, rmmdis claviformibus md plus miimsKe 
elongcdis, teretlMs, vel Icdercd'der compressiuscidis ; orificiis magnis, suhrotundatis 
vel poly gon\s, hnmevsis, interspaciis paulo angnstionhus, convexiuscidi^, Icevigcdls aid 
mimdissinie ohsoletecpie puncticidatis, separalis, nonniinqiiam in seriehns ohliqiiis fere 
reg u lainb us disposi t is. 
The large size and regularity in the arrangement of the orifices distinguishes 
this species from all others at present knoum. Tlie colonies generally form ex- 
panded layers, from Avhich shorter or longer, rounded or slightly compressed 
hranches issue, and these again appear to he ramified. On a well preserved surface 
the orifices lie hetween sliglitly elevated and narrower interspaces, hut when these 
hecome worn off and are flattened, their width often equals to, or even slightly 
exceeds, the diameter of the orifices, and their surface exhibits a fine puncticulation. 
Locality. — Poodoopolliam, in a pinkish someAvhat sandy Ihuestonc. 
Formation . — Arrialoor group. 
5. Family —CEFSCIDJE. 
(Crescida, cfOrbiguy, Caveidee, d’Orh., part). 
Colonies variable in sbapie and size, cells tubular, of two kinds, irregidarly placed 
beticeen each other, and terminating on all exposed portions of a colony. The larger', 
or ordinary, cells have rounded, often slightly elevated or margined, orifices, sometimes 
( 60 ) 
