78 
on this sandbank, on the occasion above mentioned, were 
swarming with parasitic Crustacea remarkable for their very 
large and brilliant green eyes ; lie brought away and pre- 
served a number of specimens. 
He also showed a preparation preserved by corrosive 
sublimate in a manner which he recommended for fine 
dissections. The preparation had been kept in an open cup 
for twelve months, simply water being added occasionally to 
supply what was lost by evaporation. The advantages of 
the plan were, very perfect preservation, no necessity for 
closing up so that the specimen could not be got at, no fear 
of losing a valuable dissection from accidental evaporation, 
as where spirit is used, and cheapness. The method adopted 
was to prepare a saturated solution of corrosive sublimate 
in alcohol, and when a dissection in water is in progress, a 
small quantity, as half a teaspoonful, of the solution is to be 
added from day to day if the slightest appearance of putre- 
faction is observed, but no more of it is used than is 
absolutely necessary, and by the time the dissection is 
completed, the specimen has become imperishable, from the 
union of the corrosive sublimate with the tissues, and it 
may then be kept in pure water, either open or mounted in 
the usual way. 
Mr. R. I). Darbishire exhibited a small collection of land 
shells and slugs, made by him at Gibraltar in March, 1863, 
during and after an extremely dry season. The following 
is the list : 
Arion empiricorum. Fer. In gardens on the North, 
Limax gagates. Drap. The like localities. 
Parmacella Valenciennii (?). Webb. Common, 
