VINE : POLYZOA OF THE LOWER AND UPPER GREEN SAND. 255 
Chloritic Marl, (p. 375). The author also states that many species of 
Bryozoa are found in other beds, but I notice that in his list of 
fossils, (p. 386), &c., no Bryozoa are named, therefore, in all probability, 
the species referred to, (pp. 372-375), are still undescribed, or even 
unnamed. 
In this paper I do not intend to compare or correlate the whole 
of the Cretaceous Polyzoa, but it may be well to give the summary 
of known British species as put down by Mr. Robert Etheredge — 
Upper Chalk ... 38 genera 50 species. 
Lower Chalk 6 „ 6 
Chalk Marl ... ... ... 1 genus 1 
Cenomanien 15 genera 23 
Gault 3 „ 4 
Neocomien 21 „ 34 
Total ... 8£ 1 18 
This abstract shows the status of scientific investigation on this 
group, up to date (1885), and when it is compared with the lists 
given by Morris in his " Catalogue of British Fossils" (1854), the 
slow advance of our knowledge of British Cretaceous Polyzoa is at 
once apparent. 
Prof. Morris' lists 1854 :— 
Upper Chalk . . ... ... 23 genera 45 species. 
Lower „ 2 „ 2 „ 
Chalk Detritus (Charing) ... 5 „ 5 „ 
Cenomanien (Up. Greensand) .. 5 „ 5 
Gault ! none. 
Neocomien (Low. Greensand)... 15 „ 26 „ 
Total ... _50 83 
At least nine species enumerated by Prof Morris are given on 
the authority of Dr. Sharpe, and just now it would be advantageous 
to know where the Polyzoa collected by that gentleman are located, 
as the pit out of which Dr. Sharpe got his Farringdon Fossils is no 
longer accessible to collectors, and the School of Mines Collection is, 
* Phillips' Manual of Geology and Palaeontology, vol. ii., p. 581, 1885, 
