24 
THEONOID^. 
The zooecial colonies are elliptical, and usually separated by 
valleys or depressed porous areas and not by definite regular 
laminae. - 
Dimensions. 
Diameter of zoariura ... ... ... 16 mm . 
Diameter of zooecial sub-colonies ... 4x5,, 
Width of radial ridge at outer end ... 1 , , 
Length of the same ... ... ... 2 ,, 
Diameter of apertures ... about ’08 ,, 
Disteibution. 
Senonian — Maastrichtian : Maastricht. 
PiGUEES. 
Pig. 16. Upper surface of the type-specimen ; X 3 dia. 
Maastrichtian: Maastricht. D. 11,798. 
Fig. 16 . — Mnltitubigera sulcata \ x 3. 
Aeeinities. 
The sub-colonies of M. sulcata most resemble among Actinoporce 
those of A. disticha (Hag.), owing to their wedge-shaped form ; 
but the sub-colonies are not by any means identical in the two 
species ; the zoarium of M. sulcata is quite unlike that of any 
Actinopora. The new species di:ffers from M. gr eg aria by having 
“short, wedge-shaped and not biserial ridges ; moreover, the sub- 
colonies are separated by pore-filled valleys, and are elliptical 
in shape. 
D. 11,798. The type-specimen. Maastrichter Kalk. Maastricht. Fig. 16. 
Old Coll. 
