LATTICE WORKERS, OR POLYCYSTINA. 87 



or, in other words, not identical with the sarcode of 

 the rest of the sarcoblast. Through some subtle re- 

 productive operation (of which we have learned 

 nothing from actual observation, in consequence of 

 the minuteness of the particles concerned) the yellow 

 granules become, after a time, collected together into 

 the sphaeroidal masses, now become sarcoblasts ; and, 

 possibly, two sexual elements are, at this stage of the 

 organism's history, brought into contact. It will, I 

 hope, be clearly understood, that I throw out this 

 view simply as a surmise, resting on no more stable 

 basis than a fact, observed by myself (for the accuracy 

 of which I am ready to vouch with perfect confidence), 

 that the so-called nucleus of the sarcoblast becomes 

 eventually, on the escape of that organ from the 

 parent structure, the active centre of shell or skeleton 

 development. l 



To summarise what we have narrated, and quoted, 

 of the reproductive process in these organisms : the 

 sarcoblast, or embryo Polycystin, is first recognised, 

 in the body of its parent, as a minute, spherical, or 

 almost spherical, speck or lump of granular sarcode, 

 yellowish in colour, and variable in its diameter, as 

 soon as it becomes free, ranging, perhaps, from five to 

 twenty micro-millimetres, or from one five-thousandth 



1 "On the Radiolaria as an Order of Protozoa," by Dr. 

 G. C. Wallich/in Popular Science Review, new series, vol. ii. 

 P- 273. 



