Fig. 46. Volvox. After Janet and Klein, a, V. aureus, a daughter colony of 

 small size seen through the layer of zooids of the parent colony ; the opening 

 left in the young colony at its formation is shaded, b, V. aureus, a single 

 macrogamete among the ordinary somatic zooids; abundant protoplasmic 

 filaments connect it with surrounding zooids and it contains large nucleus {a) 

 and chloroplast {ch). c, V. aureus, a plate of mature microgametes just 

 liberated from an antheridium and now beginning to separate. Each contains 

 nucleus (w), eye-spot {y), flagella, a chloroplast {ch), and pyrenoid {p). d, V. 

 globator, diagrammatic section through the middle of an old colony showing 

 three large daughter colonies projecting into the interior of the parent colony 

 which is full of thin mucilage with a radiating structure, e, V. globator, similar 

 section to d, showing three antheridia (an) in different stages of maturity and 

 three large macrogametes (e). Both types of organ have been formed from a 

 single zooid of the parent sphere into the interior of which they now project. 

 In d and e, the flagella of the somatic cells have been omitted. 



