222 
SCHULTZE, ON RHIZOPODA. 
In this instance all the chambers in the ultimate volution 
were filled with strongly refracting globular bodies^ 0*01 8'" 
in diameter, and of which 6 — 8 were contained in the larger 
and 3 — 5 in the smaller chambers. These bodies exhibited a 
peculiarly brilliant envelope, which, upon farther examination, 
by means of acid and the breaking of them up, was found to 
be solely composed of minute siliceous particles. There were 
no other animal contents in the chambers. These globular 
bodies, he sees reason to regard as embryos furnished with 
siliceous capsules, and which might be supposed to be formed 
out of the contents of the chambers in the same way that the 
Navicellce are formed in a Gregarina, and to be destined, on 
their liberation from the parent, to become the central or 
primary chamber of the future Rhizopod. 
Should this prove a correct interpretation of the nature of 
the globular bodies, it would appear, as regards the genesis of 
the siliceous shell of these E-hizopods, that it is not composed 
of a collection of siliceous fragments, but that the animal 
itself must be capable of secreting siliceous matter in the 
form of very minute granules. 
In conclusion, he adverts to the observations of P. Gervais 
(published in the ^ Comptes rendus,' ii, p. 467, 1847), re- 
specting the reproduction of the Miliolidae, and which are 
fully confirmed by his own observations now recorded. 
Gervais states that the sexes are distinct in these animals, 
and asserts that he has witnessed their conjunction in pairs 
previous to the act of parturition. How far these statements 
are correct. Professor Schultze leaves to be determined by 
future researches. 
