440 



BIOLOGY OF THE PROTOZOA 



perforated by pores arranged regularly around the entire surface. 

 (2) Actipylea, in which the pores are said to be arranged in groups 

 or lines over the surface. Schewiakoff (1926), however, in his mas- 

 terly monograph on the Acantharia, denies the presence of pylea 



Fig. 182.^-Lichnaspis giltochii, one of the Actipylea. The spines of strontium 

 sulphate are arranged in accordance with the " Miillerian law" as follows: a, n, a, a, 

 northern polar; ft, ft, ft, ft, northern tropical; c, c, c, equatorial; '/. '/. </. </, southern 

 tropical; and c, r, c, southern polar. (After Haeckel.) 



altogether. (3) Monopylea, in which there is only one such group 

 of pores. In these forms the perforated disc may be connected 

 with the center of the central capsule by a conical mass of endo- 

 plasm, the podoconus, rich in food particles and granules (Fig. 181). 



