122 



THE FORAMINIFERA 



Polytrema was associated by the earlier naturalists with various 

 animals classed as " zoophytes," and was included by Pallas and 



Fio. 51. 



Polytrema ininiaceum, Linn, a, section of the test passing along the axis of a branch, and 

 through the stem of a Polyzoan (P), to which the test was adherent ; p, the hollow pillars be- 

 tween the laminae ; B, the group of rotaloid chambers, the initial stage of the test, x 20. 

 ft, the group of rotaloid chambers (a, R), x 78 ; s, the surface of attachment to the Polyzoan ; 

 ch, the chitinous lining of a chamber, c, central part of the base of a young test decalcified and 

 treated with caustic potash, seen from the surface of attachment. The chitinous walls of the 

 chambers remain. M, the megalosphere, 1-4, the first four of the spiral series of chambers, x 78. 



Gmelin in the genus Millepora. Its Rhizopod affinities were first 

 recognised by Dujardin, and its relation to Tinoporus by Carpenter. 



