VINE : fossil polyzoa: additions to the cretaceous lists. 161 
cells like D. densata, and although the Zoarium of d'Orbigny's 
species is about the same natural size as the British the latter con- 
tains a less number of cells. The form depicted in fig, 7 partakes 
more of the character of D. orbicula, it contains a less number of 
cells than the French form. Under present circumstances, on 
account of my limited knowledge of Chalk Marl examples of Polyzoa, 
it is impossible to indicate to what extent the British forms vary. 
The material already examined show in some few cases a resemblance 
between species found in the British Cenomanian horizons and those 
described and illustrated by d'Orbigny, Reuss, and Novak, from 
French and Bohemian, Cenomanian Rocks. I throw out the hint in 
the hope that other workers on the lower beds of the British Upper 
Cretaceous Rocks will examine the fossils in their possession to see 
what Polyzoan encrustations are to be found on them. Mr. Hill, 
however, has already informed me that Polyzoa are very rare on his 
Chalk Marl Fossils, so that no great harvest is anticipated. 
Horizon : Lower Chalk on Holaster Sub-globosus, in Mr. Hill's 
Cabinet ; Chalk Marl above Red Chalk, Hunstanton. 
Explanation of Plate. 
Figs. 
1. Stomatopora longiscata, d'Orb. 
1a-1b. „ variabilis, Vine. 
2. ,, pedicellata, Marsson. 
3. Proboscina dilitata, var. Cantabrigensis, Vine. A young colony. 
4. ,, inornata, Vine. 
5. ,, Clementina, Vine. 
6-7. Diastopora regularis, d'Orb. 
8-9. Zonopora undata ? d'Orb. Variety. 
10-12. Reptomulticava collis, d'Orb. Varieties. (See text). 
13-14. Multicrescis variabilis, d'Orb. ? Thalamopora Michelini, 
Simonowitsch. 
15. Membranipora Gaultina, Vine. 
