VINE : POLYZOA OF THE LOWER AND UPPER GREENSAND. 267 
Novak comments on three other species characterised as distinct by 
Reuss and B'Orbigny ; Beren'icea Clementina and gmndis, D'Orb., 
and B. conferta, Reuss. The whole of these species are found in the 
Planer-Kalk'" of Germany, In establishing Diastopora fecunda as a 
new species, wliether new to the Cambridge Greensand of Britain 
only, or new, generally speaking, to the Lower Cretaceous horizon, 
Continental or British, remains to be seen. The forms which I have 
characterised by this name are the most abundant of the Camb. 
Greensand species whether attached or free, and they are the niost 
variable. When briefly remarking on the structural features of pre- 
pared sections I wrote as follows : — " In a semi-transparent section 
of D. fecunda the peculiar structural features of the species 
are very apparent. The super-imposed colonies originate from 
marginal cells, and the initial stage of a new colony is flabellate and 
ultimately disciform, the new colonj^ entirely obliterating or covering 
up the original." (Camb. Gr. Pap., p. 10, op. cit.) The profile out- 
line of some of the examples of D. fecunda, Vine, closely resemble 
some of the " natural size" figs, of Beren'icea confluens Roem sp. 
(Novak, p. 98, pi. iv., figs. 19-22). and the cells in transparent sec- 
tions that I have recently prepared are certainly " confluent," but 
this is not the sense of the word, I take it, as used by Novak. Novak 
appears to refer to the outward surface, and not to any sectional 
characters. If I do not mistake his meaning then, the Bereniceaf 
confluens of Roemer, Reuss, or D'Orbigny, is not the Diastoprnxt 
fecunda of British rocks. Having pointed out to the student what 
D. fecunda is not, I will now point out what the species is. In trying 
to diagnose the characters of the form I did my best to do it briefly, 
but a careful re-examination of the whole of my own and Mr. Jesson's 
free," not the adherent examples which could not be placed under 
the microscope, I find certain characters in some of them which may, 
or may not be, regarded as separate species, but they may perhaps be 
regarded as varietal. 
* " Planer-Kalk," the German name for the white argillaceous chalk, a 
deposit which resembles, both in composition and organic remains, the Chalk- 
Marl of the English series. Lyell. Elements, p. 270 Ed. 1878. 
t Rosacilla Roem : Reptomultisparsa, D'Orb, ; Diastopora and Berenicea 
Reuse. 
