JURASSIC A.STR0RHIZID2E AND LITTJOLID^. 29 



Discussion. 



Prof. Rttpekt Jones said that these deposits seemed to be of much 

 interest. The difference of shape in Foraminifera was so great 

 that it was not an easy task to settle the limits of a species. He 

 described the mode of formation of the tests of arenaceous Forami- 

 nifera. The author had doubtless spent great pains in working 

 out these Foraminifera. Arenaceous Foraminifera (JNodosarians) 

 occur as far back as the Permian. The Society was indebted to 

 Dr. Hausler for his important addition to our knowledge of the 

 Swiss Foraminifera. 



