VINE : PALEONTOLOGY OF THE WENLOCK SHALES. 225 
were " common to the "Wenlock rocks aud the Upper Llandovery : or 
in other words these 125 species pass up from the Llandovery to the 
"Wenlock formation."^ The geographical distribution of these species 
include North and South Wales, Westmoreland, Scotland, and Ireland. 
By far the greater number enumerated are found in the "Wenlock 
limestone series, the debris of which has been so persistently searched 
for fossils, both by the palseontological student and by the general 
dealer in fossil organisms, and the results of their united 
investigations are by no means surprising. In the Catalogue of 
Fossils in the School of Mines (1878) the whole of the Cambrian and 
Silurian fauna are carefully tabulated, stratagraphically, and while 
the Wenlock limestone fauna occupies twenty-three pages of the 
catalogue, the fauna of the Wenlock shales, to which attention will be 
presently directed, are catalogued on ten pages only. In the same 
presidential address Mr. Etheridge furnished a series of tables of the 
distribution of species in the different Palaeozoic horizons, which to 
the student of Stratagraphical Palaeontology is most valuable. 
The whole of the then known Wenlock shale fauna were included 
in twelve classes, and are as follows : — 
Class Hydrozoa 5 genera, probably 7 species. 
»» 
Actinozoa 
3 
M )> 
3 
♦1 
»» 
Bchinodermata 
6 
n n 
7 
11 
f» 
AnneMa 
5 
•» II 
5 
»i 
»J 
Crustacea 
18 
II »i 
41 
11 
t» 
Polyzoa 
2 
II only 
2 
11 
« 
Braohiopoda 
15 
„ about 
42 
11 
LlameUibrancbiata 
23 
27 
11 
» 
Gasteropoda 
5 
6 
11 
Pteropoda 
4 
II 11 
4 
11 
)l 
Heteropoda 
1 
1 
Cepbalopoda 
5 
II II 
18 
V 
92 
163 
II 
If then we deduct the 92 genera and 163 species from the list 
of Wenlock limestone forms given above by Mr. Etheredge, it will be 
seen that there are 79 genera and 373 species less in the shales than 
in the limestone. Since the catalogue was compiled, and even since 
* Pres. Address, Quart. Journ. GteoL Soc, Feb., 1881, p. 132. 
