EETECATA. 
193 
than the ohvcr?;c part of the zoarium. In the distal end the 
shape is biconvex. The reverse face is marked by inter- 
zooecial depressions. 
Zooecia numerous, occurring in series of from six to fifteen. 
The apertures occur in long, horizontal, straight or curved 
rows, and are confined to the obverse lamina. 
Peristomes slightly prominent. 
Dimensions. 
Breadth of a branch : lamina 
Reverse axis 
Thickness of a branch 
Diameter of zooecia 
Diameter of aperture 
Distance of transverse series 
Distkibution. 
Senonian — Maastrichtian : Maastricht; Falkenberg ; Kuuraed; Saiute- 
Colombe, Mauche ; Royan. 
Coniacian : Les Roches, Loir-et-Cher. 
Affinities. 
That C. ramosa, Orb., and I. macilenta, Hag., are identical, there 
is little doubt ; and as von Hagenow’s diagnosis was published 
earlier than that of d’Orbigny tlie name of mac (lent a ought perhaps 
to stand. But as d’Orbigny ’s figure was probably issued earlier 
than von Hagenow’s monograph, the name of ramosa is retained. 
M. Pergens has (piotcd the Tub uj era antiqua, Orb., as a synonym 
but the species seems to be a Grinina and a synonym of C. disticha, 
for d’Orbigny-’s figures give no suggestion whatever of a reverse 
axial rod. 
LIST OF SPECIMENS. 
D. 3549. One zoarium showing clasping base (in tube). Maastrichter Kreide^ 
Maastricht. Van Breda Coll. 
D. 3548. One branch of a zoarium showing more distal portion than in the 
previous specimen. Maastrichter Kreide. Maastricht. Van Breda 
Coll. 
^ In three adjacent curved rows, the inside measurements of the apertures in 
adjacent zooecia are as follows : — 
Row 1 : ’Ooi, ’082, *109 mm. 
Row 2 : -054, -063, -091 „ 
Row 3 : 'Ooi, *09 ,, 
These measurements illustrate the variability of dimensions. 
Fide Perjreus. 
14--18 mm. 
•09 
•■5--6 „ 
B.M., D. 3549. 
1 mm. 
•5 ,, 
9 
J » 
• 1 6 , , (average) 
•05--1 
•4-'5 ,, 
0 
