VINE : POLYZOA OF THE LOWER A^'D UPPER GRKENSAND. 271 
Horizon : Phosphate Beds, Cambridge ; Dans V etage senonien, 
a Meudon. 
24. Lichenopora radiata (?) And., or variety, Vine, Camb. Gr. Pap., 
p. 11. 
Horizon : Phosphate Beds, Cambridge. 
Sub-Order Cheilostomata, Busk. 
25. Membranipora Dumerilli, Aud. 
Var. Cantabrigiensis, Vine, C. G. Pap., p. 14, pi. ii. 
On the example of Radiolites Mortoni previously referred to, 
under Stomatopora linearis, var. Mortoni (ante.) there is a large 
colony of this peculiar species. There is not any appreciable differ- 
ence between this and the other examples described in the former 
paper, only as this is attached the additional horizon for the species 
has a certain historical value that will be, I think, appreciated. 
Habitat : On Kadiolites Mortoni, Mant. 
Horizon : Cambridge Greensand and Phosphate Beds. 
26. Membranipora cretacea, D'Orb. 
1851. Flustrellaria cretacea, D'Orb., Terr. Cret., v., p. 519, pi. 724, 
figs. 5-8. 
On several fossils belonging to the Cambridge Greensand horizon 
I have found colonies of Membranipora, rather small — but, so far as I 
have examined them by the hand-glass — characteristic. These seem 
to me to be allied to, if not identical with, two of D'Orbigny's types. 
One of the forms with oval cells, with thin walls and cells arranged 
pretty regular in diagonal lines, I place here. 
Habitat : On Radiolites Mortoni. 
Horizon : Cambridge Greensand. 
27. Membranipora cretacea. 
var Francqana ? D'Orb. 
1851. Flustrellaria Francqana, D'Orb., Terr. Cret., v., p. 525, pi. 725, 
figs. 13-16. 
The cells of this variety are similar to the last, only some of the 
cells depicted by D'Orb. are a little more compressed, or bulging at 
the extremities, than the typical form. 
Same Habitat and Horizon. 
