ON LIEBERKUHNIA WAGENERI. 
141 
the sarcode remains yellow ; but it has not so good an 
an effect in other respects. Figures S and 6 are from selected 
specimens mounted like the last two in glycerine jelly, but 
not previously treated with reagents. In the former the 
nucleus proper is plainly discernible, but its coverings are 
somewhat confused, whilst fig. 6 shows the two coats very 
clearly but not the nucleus itself. 
From the appearances that have been described, it is evi- 
dent that the moving lines noticed in the nuclei of the living 
specimens are caused by the alternate opening and closing 
of the folds of the inner envelope, and that the lines indicate 
the approximation and separation of its free thickened edges. 
This movement is probably initiated by the contraction and 
dilation of the nucleus proper, thence communicated to the 
embracing envelope, and by it rendered apparent. 
The object of this movement, which takes place without any 
regularity as to time, it is not easy to conjecture. It does 
not appear to have any very close connection with, or effect 
upon, the rotation of the sarcode within the body of the 
animal ; but that it serves some definite purpose, probably 
an important one in the economy of the creature, can scarcely 
be doubted. 
All the sketches of the nuclei were drawn originally twice 
the size of the engraved figures, as it was found that the 
details of structure were better displayed under higher mag- 
nifying power. 
At present it would be premature to assign to Shepheardella 
t(£niformis any systematic position, nor could this be attempted 
satisfactorily until the particulars of its life history are more 
fully known. What has been already made out appears to 
indicate that it belongs to the Rhizopoda, but there seems 
no type hitherto described with which it has any close 
affinity. Apart from its remarkable nucleus, there would be 
little reason why it should not be placed near Lieherkiihnia 
Wageneri^ in company with which it occurs at Tenby ; but 
the presence of the complex body, the structure and move- 
inents of which have been described, suggests a somewhat 
higher organization than we are accustomed to associate with 
Rhizopod life. Upon this point, as well as upon others 
which have been mentioned, I trust to be able before long to 
add to the notes now offered, which must be regarded as 
tentative only. 
The Other Rhizopod to which I have referred, Lieherkiih- 
nia Wagenerij was first found in the neighbourhood of Berlin 
by MM. Claparede and Lachmann, and was described and 
