740 Transactions of the Society. 



Of the nature of the two clays, it will be enough to note that 

 the residuum, after washing, of the brown clay was mainly small 

 crystals of selenite, a little coarse subangular sand, and microzoa, 

 the whole residuum being 2h per cent, by weight of the amount 

 washed. The clay, almost orange-brown when wet, was a dull red- 

 brown when dry. Of the black clay (bluish-black, drying grey and 

 showing when broken numerous sparkling points, the surfaces of 

 quartz -grains and scales of mica) the residuum, 1£ per cent, 

 by weight of the sample taken, consisted of fine sand, mica, a little 

 carbonaceous matter, and microzoa. No selenite was found in this 

 black clay. 



Traces of other organic remains were very scanty ; the brown 

 clay yielded one fish-scale ; and the black clay some woody frag- 

 ments, a small vertebra of a fish, a Natica, a Nucula (broken), 

 fragments of echinoderm spines, and a specimen (crushed in on 

 one side) of Nautilus regalis, containing in the adherent clay 

 impressions and casts of Ditrupa, and with a Vermicularia 

 encrusting a portion of the shell. 



In the body of the paper the reader will notice in the descrip- 

 tion of a few species a note to the effect that they were also 

 found at Chelsea. The exact locality was at the eastern foot of 

 Stanley Railway Bridge, King's Road; and they were obtained 

 from a sample of clay collected by Prof. Kupert Jones, merely 

 as a test. We have noted their occurrence, but shall make no 

 special point of it until we have systematically worked out the 

 clay from this spot. 



In writing this paper we have derived much advantage from 

 Professor Rupert Jones' advice, and from the use of his books 

 relating to the subject. 



The Entomostraca. 



Through the kindness of Professor Rupert Jones, we are 

 enabled to give the following preliminary list of the Entomostraca. 

 This we may reasonably regard as very interesting, when we take 

 into consideration that the total number of valves did not exceed 

 nineteen. 



Cythere scrobiculoplicata Jones. 

 Cythere scabra v. Miinst., new to Britain. 

 Cythere triangularis Reuss. 

 Cytheridea perforata (Roemer). 

 Cythereis Boiverbankiana Jones. 

 Cythereis sp. nov. 

 Cytherella compressa v. Miinst. 

 Bairdia barbata ? (Sow.). 

 Macrocypris ? sp. 



