ON THE LIFE-HISTORY OF THE FORAMINIFERA. 133 



small nuclei which are found in the protoplasm in the later 

 stages of the megalospheric form. 



Besides these bodies which are stained by picro-carmine, 

 several others are commonly present in the protoplasm. Among 

 these may be mentioned : — 



(1) Clear transparent globules which swell in water, and 



give the appearance of concentric light and dark 

 bands with transmitted light ; they are 3 to 4 /i in 

 diameter, and do not stain violet with iodine. 



(2) Dark yellowish-brown globules, having a diameter of 



4 fjb and under. They are sometimes present in large 

 numbers (fig. 5). 



(3) Pale yellow bodies of the same diameter, but less highly 



refracting than the last. 



Radial arrangement of the Reticulum about the Nuclei. — In 

 many cases, both in the megalospheric and microspheric forms 

 the strands of the protoplasm are set in radiating lines about 

 the nuclei (figs. 10 and 23). On examining whole specimens 

 of the megalospheric form after decalcification, it is often 

 seen that the outline of a chamber is indented opposite the 

 nucleus. This effect must be due to the shrinkage of the 

 nucleus after the wall of the shell is dissolved, the shrinkage 

 of the nucleus having been gi-eater than that of the protoplasm 

 as a whole. The effect of this shrinking must be to produce a 

 radial arrangement of the strand of the reticulum about the 

 nucleus. It appears impossible in preserved specimens to dis- 

 tinguish such an artificially produced arrangement from any 

 slightly-marked radiating disposition of the protoplasm which 

 may exist naturally. 



The Microspheric Form (figs. 6-12). The Microsphere is 

 a nearly spherical chamber, whose diameter varies in different 

 specimens from 6'5 to 13 fi. The average of the mean diameters 

 in twenty-seven cases is 9"6 /j,. 



The second chamber is of the shape of a somewhat curved 

 cone, and is applied to the microsphere by its concave side, 

 communicating with it by a short canal at or near its apex. In 



