THOLOPOEA,. 
275 
Distribution. 
Lower G-reensand : Farringdon, Berkshire. 
Figures. 
PI. lY. Fig. la. The type-specimen from above ; nat. size. 
Fig. 75, the top of one of the vertical columns; x 8 dia. Lower 
Greensand: Farringdon. (? Baker Coll.) D. 7288. 
Fig. 73«, The side view of the same specimen; nat. size. 
Fig. 735. One column of sub -colonies ; X 6-9 dia. D. 7288. 
Affinities. 
This species has a massive aspect, and resembles the Radiopora 
tulerculata from the French Cenomanian and Cambridge Greensand; 
but the species is a Tholopora, its zoarium being built of columns 
composed of numerous bun-shaped sub -colonies. Its nearest ally 
is Tholopora virgulosa, from which it differs by its more massive 
zoarium, that species being essentially tufted or sub-dendroid. 
Fig. 73 . — Tholopora colligata. a, zoarium from the side, nat. size ; b, side-view 
of one column, x 6*9. D. 7288. 
It is allied in age and by its massive appearance to TKolopora 
muletiana (d’Orb.), but differs from that species by the absence 
of the central depressed series of zooecia free from mesopores, and 
the less perfect radial series of apertures. 
D. 7288. The type -specimen. Lower Greensand. Farringdon. (? Baker Coll.) 
Fiffd. PL lY. Fisr. 7 and Fisrs. 73a and b. 
