PLATE XI {continued). 



Kg. 



investment. A new bud is seen at eacli side within the cell, near its anterior 



extremity. 



35. Embryo of Plumatella fruficosa. 



36. Statoblast of Lophopm crijdalUrms in a very early stage, in which it appears as a minute 



swelling upon the funiculus. 



37. The same more advanced. The contents of the statoblast are here seen to be divided 



into two distinct portions. 



38. The same still further advanced. The division into two masses has disappeared, and the 



■whole contents are surrounded by a distinctly cellular membrane. 



39. The same after the appearance of the annulus, which as yet presents but a simply 



granular structure. 



40. Peculiar cells from the annulus in a later stage of development. 



41. The statoblast ruptured under compression, and the couteuts escaping in the form of 



minute cells. 

 4r. A group of cells constituting the contents of the statoblast, more highly magnified. 

 41''. Peculiar refractive corpuscles constituting the contents of these cells. 



42. Statoblast of Plumatella repens, with the young polyzoon escaping from it. Its two 



faces have separated from one another, and are seen still adhering to the posterior 

 part of the polyzoon which floats freely through the surrounding water. The 

 polypide is here represented as e.Kserted from its cell. 



43. The same, with the polypide retracted. 



