378 REPORT—1890. 
Report of the Committee, consisting of Dr. H. WoopwarpD, Mr. G. 
R. Vine (Secretary), Drs. P. M. Duncan, H. C. Sorsy, and 
Mr. C. E. DERancE, appointed to prepare a report on the COre- 
taceous Polyzoa. (Drawn wp by Myr. G. R. VINE.) 
Tue Polyzoa of the Cretaceous epoch have been partially dealt with in 
two of my previous reports;! owing to recent researches I am com- 
pelled to return to the subject. In this supplementary report, how- 
ever, I shall confine my attention to the study of the stratigraphical 
distribution of British Cretaceous Polyzoa only, and that chiefly of species 
found in the lower beds of the Upper Cretaceous series, and in the 
Neocomian rocks below. 
Recently these lower beds of the Upper Cretaceous series have 
occupied a good deal of special attention from the members of the 
Geological Survey and others. The various zones of the Chalk have 
been carefully studied in several localities, and comparative lists of fossils 
published; but, as I find no mention of Polyzoan remains in any of 
these lists, it may not be deemed ont of place if I endeavour to supply 
this deficiency in the present report. 
In the second (or Paleontological) part of Phillips’s ‘Manual of 
Geology,’ Mr. Etheridge ? has given an elaborate analysis of the distri- 
bution of Cretaceous fossils in our British rocks. In the division of that 
list devoted to the Polyzoa, the author enumerates, under 59 generic 
names, altogether about 114 species as having been either catalogued 
or described from the whole of the Cretaceous series. It will be con- 
venient, therefore, to take Mr. Htheridge’s list as the basis of this report, ~ 
in order to draw the attention of the working paleontologist to the 
value of Polyzoa in dealing with, or characterising differences im, the 
various British Cretaceous beds. The evidence as regards the zones, I 
admit, is not complete ; and for the simple reason that only a very few 
students, as yet, have entrusted me, for examination, with fossils from 
special zones on which polyzoan incrustations are found. All the 
evidence, however, that I am now able to offer, is the result of the careful 
study of over twelve hundred fossils derived from different horizons of 
the Chalk, both Upper and Lower,? and from British Neocomian, or 
so-called Neocomian, beds below. 
The 114 Cretaceous species of Polyzoa are distributed as follow :— 
_— Genera Species 
Upper Chalk . - . 6 ; : : 3 38 61 
Lower Chalk . 5 ' - ' : b 4 6 6 
Chalk Marl . : ‘ : 1 1 
Cenomanian, or Upper Greensand 5 4 : 15 23 
Albian, or Gault . 5 , ‘ 3 4 
Neocomian, or Lower Greensand . : 4 é 21 34 
As nearly the whole of the generic names which are adopted by Mr. 
1 Fourth (Brit. Assoc.) Report on Fossil Polyzoa. 1883. Fifth Report on Fossil 
Polyzoa. 1884, 
2 New edition, 1885, pp. 589 and 590. 
3 The evidence from the Middle beds is incomplete. 
