268 VINE : POLYZOA OF THE LOAVER AND UPPER GREEN SAND. 
(a) Normal (or typical ?) " Zooecia variable, elongated, but 
rarely exposed except at the distal extremity of the cell ; orifice 
circular ... or slightly elongated (worn), peristome thin, not promi- 
nent ; cells not wholly contiguous ; sparsely punctured." (C. G. Pap., 
op. cit., p. 10). This is the general character of the " basal" 
colonies of the dome-shaped D. fecuncla. 
(b) Young, or newly-formed colonies on the apex of the dome. 
These are variable, and some of them simulate the features of what 
now passes for two distinct species. In one stage of these newly- 
formed colonies I find most of the features of the species characterised 
as Berenicea Clementina, D'Orb. (Terr. Cret., p. 865, pi. 636, figs. 
1-2. The cells are not quite so contiguous, but the colonies are 
either "discoid" or " fiabelif or m," and are marked (rugose?) trans- 
versely like D'Orbigny's, fig. 2. In another colony I have traced 
similar characters to Novak's Berenicea 2nIosa (Bohm., Kreid., p. iv, 
figs. 1 to 10), but more especially the raised peristomes with hair- 
like" markings on the front, like the fig. 5 of pi iv., : other cells are 
marked with " pilosa" markings like fig. 4, but the Zooecia are neither 
so long nor so contiguous as is represented in that figure. There is, 
apparently, another stage in some of these younger colonies, the 
Berenicea conferta stage, but as examples of these are not so well 
marked or so characteristic as the others they may be only passingly 
referred to here. Whether, as I have already remarked, I should be 
justified in ranking the smaller colonies as separate species, or 
whether I should leave them as mere abnormal growths, with distinct 
specific features, may be now briefly considered. In these smaller 
colonies I have not been able to trace any of them as passing from 
one form to another, but nearly the whole of the forms refen-ed to 
are found, (parasitic ?) on Diastopora fecunda. One of the so-called 
"stages,"^. Clementina stage, however, seems to be rather more 
constant, and this species of D'Orb. may, I think, be safely considered 
as being present in the Cambridge Greensand material ; but of the 
others 1 am somewhat doubtful of their right to be ranked as distinct, 
or to find a place in the lists of the British Cretaceous Polyzoa fauna. 
What I have said already may induce others to overhaul their Cam- 
bridge Greensand Fossils, and if satisfied, publish the results of their 
investigations. 
