228 VINE : PALEONTOLOGY OF THE WENLOCK SHALES. 
backed, before I received ample supplies from Mr. Maw. The debris 
itself, washings probably from about sixteen tons of shale, weighed 
nearly two-and-a-half hundred weight, packed in eleven small boxes, 
each box representing, if not a different horizon of the shales, at 
least a different locality. Since May, 1881, 1 have given most of my 
leasure time to the picking out of the minute as well as the larger 
organisms from this mass of material, always with a hand-glass under 
my eye, which magnifies from five to twelve-and-a-half diameters. In 
this way more than two-thirds of the material supplied to me have 
been carefully searched. Of the Actinozoa, Echinodermata, Crustacea, 
including the Entomostraca, Annelida, Polyzoa, Brachiopoda, and 
Gasteropoda, I have, without exageration, at least 200,000 specimens. 
The Polyzoa (partially) I give a description of in the present 
number of the proceedings, and in past years, in the pages of the 
Quarterly Journal of the Geological Society, I have described Polyzon 
and Annelida. In the Annals and Mag. of Nat. History, for 1886,'" 
Prof. T. Rupert Jones, F.R.S., and Dr. Holl, have described several 
groups of the Entomostraca, other descriptions to follow, all pickings 
from the Wenlock shales. It gives me great pleasure to speak of the 
kindly co-operation of these specialists, and had I met with some one 
who would have co-operated with me, the Actinozoa division, chiefly 
the Monticuliporidse of my list would have been much fuller than it 
is. The Monticulipora and Actinozoa tabulated are chiefly those 
which have been fully described by Dr. Nicholson in his published 
writings, and details may be found in "The Tabulate Corals,"t and in 
the " Genus Monticulipora." J Other species are given from the same 
author's papers on Palaeozoic Micro-palaeontology, in the Annals and 
Mag. of Nat. History. Otherwise I have not cared to load my list 
with MS. names. In some cases, however, I have been able to indi- 
cate affinities, and these I have not kept in the back-ground. Of 
the Brachiopoda of the list, I have depended largely upon the pub- 
lished writings of Dr. Davidson, but even in that group I have given 
the results of my own investigation, rather than mere extracts from 
the papers, and my species were named for me by Dr. Davidson him- 
self While searching the shales tli3 Dr. always took a kindly interest 
in my special labours, whenever I sought information from him res- 
* April and May numbere. f Edinburgh, 1879. t Ibid, 1881, 
