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Mr. Epwarp Weruerep exhibited an eyeless fish (Amblyopsis) 
_ and a crustacean likewise without organs of sight, taken by the 
exhibitor at a distance of eight miles under ground in the 
Mammoth Cave of Kentucky. These afford a striking instance 
of the non-development of unused organs. The absence of 
visual power in animals whose lives are passed in darkness was 
further illustrated by Dr. Day in the case of a small fish (scopelus 
indicus) which is an inhabitant of the profound abysses of the 
Indian ocean, where no light can penetrate. This animal has 
the eye largely developed, but in order to supply the light 
which is absent in those sunless depths, it bears along the 
dorsal ridge a series of luminous specks which are believed to 
act as lanterns. They are found, like true eyes to possess a 
cornea and an aqueous humour, and behind all are cells which 
are supposed to have the power of generating light. 
The First Field Meeting of the Club for the season was held 
on Thursday the 20th May. The rendezvous was at 
BERKELEY ROAD STATION. 
A visit to the Silurian up-thrust at Purton, which formed part 
of the programme was necessarily abandoned, by reason of the 
tide in the Severn not serving. The party therefore proceeded 
to examine the Section in the Middle Lias opened up by the 
large quarry of Tait’s Hill. The Middle Lias here, as at many 
other points along the Cotteswold range, is readily distinguished 
by a sort of step or shoulder, formed by the resistance offered 
by the hard rocky band which presents so prominent a feature 
in the formation to the denuding agencies which have shaped 
the bays and promontories of that remarkable coast-line. 
At Tait’s Hill, the Rey. Dr. Surrue in response to the call 
of the president, proceeded to explain the divisions of the 
“‘ Marlstone” or “ Middle Lias,” its geographical position, and 
its relation to the overlying and underlying beds. Geologists 
have found it convenient to divide these beds into zones, 
distinguished by particular Ammonites, inasmuch as these 
-cephalopods are found to have a limited range in time, and 
