IN MEMORIAM—GEORGE WILLIAM SHRUBSOLE. 339 
groove, which penetrated to the lowest shell layer, and continued to 
widen and spread as time went on. During the time the Planorbes 
were living in the Trent Canal the shell was entire, while three 
months’ existence in water taken from the River Dee produced the 
appearance I have described.’ He analysed both waters, and in that 
from the Trent Canal there was a great quantity of lime, while in 
that from the Dee there was very little, from which he concluded 
that the carbonic acid in the Dee water dissolved the calcic 
carbonate of ‘which the shelly structure of the mollusca is mainly 
built up.’ He pointed out, however, that shells with a thick 
epidermis escape this fate. In 1884, he published a complete list 
of the land and freshwater shells of Chester and District, which 
appeared in part 3 of the ‘Proceedings of the Chester Society of 
Natural Science.’ On antiquarian subjects, he published papers in 
the proceedings of the ‘ Historic Society of Lancashire and Cheshire’ 
and in ‘ Archzologia Cambrensis’ from 1890 to 1892. In 1886, 
Mr. Shrubsole wrote a paper which was published in the Journal ot 
the Archeological Society: ‘On the Age of the City Walls of Chester.’ 
This was, doubtless, the outcome of a paper read before the ‘ Chester 
Archeological and Historic Society,’ entitled ‘The City Walls of 
Chester ; is any portion of them Roman?’ He contended that no 
part of the walls was Roman masonry in situ, basing his arguments 
upon the absence of structural evidence, that the present ‘walls’ 
were built by the Romans, also that the perishable nature of the local. 
stone used for that purpose (the Bunter Pebble Beds, sandstone) 
made it very improbable that the walls of Chester were of Roman 
construction. The paper was read on December 3rd, 1883, and it 
is recorded in the Society’s Journal that the discussion was adjourned _ 
to the 4th of February, 1884, nor did this suffice, for it was again 
oe adjourned to February 18th, 1884. The discussion became very = 
animated and soon spread far and wide among Antiquarians, and — 
cc great interest was aroused in the matter in dispute. A fund a 
raised to defray the expense of a thorough examination of me 
ee: of the North Wall of the City, w which resulted in finding Ds 
f : merits or demerits of the controversy, but not as to the practical : 
-Tesults of the investigation of the structure of the North Wall. The 
‘finds’ are now exhibited in the Grosvenor Museum, Chester, ~~ , e a 
tere in the United Kingslon. Mr. Shrubsole was for a ‘number a 
of years honor to the Chester J gical and Historie ‘ 
