A chart of ike Rugose corals. — Sherzer. 
299 
Present in periphery. 
Occupying the spaces 
between the super- 
posed laminae. 
DISSEPIMENTS. 
Present in central portion of 
visceral cavity. 
Funnel-shaped tabulae are 
present at the center. 
Present in interseptal 
and intercostal areas. 
Arranged 
rows. 
in oblique 
Confined to broad central 
area. Remote. 
Poorly developed. 
Fill up visceral cavity. 
Coarse, cover the cell 
cups and more or less 
fill up cavity. 
Occupy entire visceral 
cavity. Coarse and 
lenticular. 
Fill up entire cavity 
Comparatively coarse 
Present. 
Inter lamellar cysts 
continue to center. 
Coarse. 
Present. 
Visceral cavity con- 
tains a meshy, vesic- 
ular structure. 
Developed much as in 
Cystiphyllum. 
Present in interseptal None, 
cavities. 
Rows of vesicles not 
arched upward at 
center. 
TABUEyE. 
No columella. 
Small, but little developed. 
Styliform columella indis- 
tinctly developed. 
Present only as blistered, ir- 
regular cell cups. 
Wanting or rudimentary; 
formed by the vesicles. 
Almost obsolete in type. In 
C. infundibulus. funnel 
shaped but incomplete. 
Wanting. 
Complete, horizontal, well 
developed. 
Rudimentary or entirely ab 
sent. 
Present and forming a 
vesicular structure 
with the tabula.. 
Present in the intersep- 
tal cavities. 
Funnel-shaped and but little 
developed. 
Rudimentary or absent. 
CENTRAL AltEA. 
No columella, but a papillose 
projection may occur. 
Septa do not reach center. No 
columella. 
No columella. 
No columella. 
Smooth and flat in calyx. 
Ridges a1 times reach center. 
Smooth and flat. No colu- 
mella. 
No columella. 
No columella. Convex sur- 
faces of the vesicles are dis- 
tinct. 
No columella. 
No columella. 
No columella. 
Dense zone in outer 
area: sparse within. 
Sparse and remote. 
Dense in outer area: 
fewer towards center, 
Few and rectangular. 
Interrupted and irregular. 
( loncave at (■enter, convex 
j beyond. _____ 
Rudimentary and replaced 
by cells. 
Concave at center, convex in 
intermediate area. 
A depression exists at the ecu 
ter of calyx. 
More or less rudimentary. 
Fine and dense in a nar- 
row outer zone. 
Abundant in outer area, 
fewer towards center. 
Minute at center, l'.road and 
convex in intermediate 
area. 
More or less remote. Crowd 
ed and vesicular in some 
forms. 
Occupied by a system of ir- 
regular, minute, spheroidal 
cells. 
Slightly elevated, With series 
of ridges converging towards 
center. 
A reticulate structure is 
formed hy union of I he cen- 
tral septum of each fasc icle. 
Inner edges of septa form a 
pseudo columella. 
Central boss raised on dorsal 
side, depressed on ventral 
side, corresponding with tabula. 
