November. 1910. 



KNOWLEDGE. 



423 



Front a pliotoi^rap/i 



lliiplopliriii^iinniii 



Figure 



anaricitsc d'Orbisny. sp. T\pical shalluw water British variety 

 from Selsev. Sussex. X 85. 



■■ perishes " under the in- 

 fluence of drying by heat, 

 and that in the subsequent 

 processes of floating, drying 

 and sifting, the shell is 

 disintegrated and disappears. 

 In .\[)ril and June of this 

 Near (1910) we made careful 

 washings of large quantities 

 of sea-weeds from the rocks 

 which are exposed at low 

 tides round the base of 

 the Mixon Beacon at Selsey 

 Rill, Sussex. The mud 

 and sand containing living 

 h'oramiiiifera thus obtained, 

 were preserved and cultivated 

 by us in a series of small 

 obser\-ation tanks such as we 

 described in the first jiaper 

 of this series, and it must be 

 noted that this material was 

 never exposed to the elutriat- 

 ing action of the waves as 

 thev reach the shore. Among 

 the first Foraminifera to 

 emerge from the mud at the 

 bottom of the tanks were 

 a large number of exception- 

 alK' fine specimens of this 



from the spiral it adds a 

 series in a straight line, so 

 that the entire shell is crosier 

 shaped. In our small British 

 specimens this shape is not 

 ver\- noticeable, but in large 

 deep water specimens the 

 elegant crosier shape is \er\ 

 marked. It is a species ol 

 world-wide distribution, but 

 very rarely recorded except 

 from deep water in which it 

 has been found down tn 

 a depth of j,125 fathoms. 

 Its geological record accord- 

 ing to Brady extends back 

 to the Carboniferous period, 

 so that it is one of thi 

 oldest of the recorded 

 Arenaceous types. 



As we have said above. 

 Hiiploplinii^iiiitiiu <r,i,',s,'/////;/- 

 iiits is not a prominent oi' 

 common object in dried. 

 floated and sifted shore 

 gatherings. It seems clearly 

 established b\- our observa- 

 tions that the cement which 

 agglutinates the sand- 

 fragments of which this 

 Rhizopod builds its shell 



/■/-('/// « plu'l,>ii)n/'h 



i>y A. K, Smith. 



■IGl'KE O. 



HaplDphi-a^iiitiini canancnsc d'Orbigny, sp. Specimens of the large North Sea or 

 Arctic tvpe K = H. cmsshiiargo Norman. Vice Museum Normanianum, (189i) 



p. 17 footnote) X 22. 



