12 
VINE: CAMBEIDGE GEEENSAND, 
The Greensand Polyzoa of the Continent has been studied and well 
described by foreign authors — Hag-enow, Roemer, Reuss and 
Novak — but owing to the scarcity of material in England very little 
attempt has been made by specialists to search for and describe 
other than the older and well-known forms of Farringdon and 
Warminster. The species of these two horizons have a peculiar 
facies of their own — but the facies of the Cambridge Greensand 
Polyzoa are altogether distinct, and in my identifications I have been 
able to correlate but few of the fossils now described with forms 
previously known. 
It will be noticed in my descriptions that I have not given in 
any case the habitat of the forms. The fault, however, is not mine 
for the whole of the specimens — excepting the Wehhina among the 
Foraminifera — were free, or unattached to any matrix. In some few 
instances I have been able to supply this very desirable information, 
for Mr. Jesson, with his usual kindness, went over the whole of his 
large collection of Cambridge Greensand fossils for the express 
purpose of selecting those which were encrusted, or had the least 
indication of Polyzoa being attached to them, and out of a collection 
sent to me of about fifty or more specimens I have been able to 
select a few that had been habitats of the once living colonial mass. 
This data will be valuable to future collectors, and may help to bring 
to light other species from the Cambridge horizon. 
LIST OF FOSSILS FURNISHED FOR OBSERVATION. 
1. Ostrea cunabula, Seeley. Polyzoa, Diastopo^a Sp. 
2. PharetospoDgia straharii, SoUas. Polyzoa, but indistinct. 
3. „ ,, „ Diastopora fecunda, Vine. 
4. Radiolites Mortoni, Mantell, Diastopora and Memhranipora Sp. 
5. Ostrae sp. ; attached to Radioletes. Diastopora fecunda, Vine, 
The above are selected from a Hst of specimens from the 
Cambridge beds numbered 1 to 24. Most of the other specimens 
have encrustations, Webbina, &c., but no distinct traces of 
Polyzoa. 
The species of Polyzoa and Foraminifera now described are as 
follows : — 
