178 



MARINE BIOLOGICAL LABORATORY. 



like, radiating structures. The fornner corresponds to 

 the outUne of the original nucleus, as will be shown later, 

 and the latter constitute the asters of Fol, spJieres at- 

 tractive of van Beneden, or, to use a more recent nomen- 

 clature, the arcJioplasviic spJieres of Boveri. The central 

 area of archoplasm (/i), is situated in the substance of 



J^-z--^.- -''r^-^rr^j 



Fig. 2. — Asterias. 



the cytoplasm {C). From the granular archoplasmic 

 substance as a centre, there radiate out in all directions 

 a large number of fibre-like rays, the archoplasmic fila- 

 me7tts {B and E). A portion of these ray-fibres pene- 

 trate into the elliptical part of the figure, and constitute 



