94 JOURNAL OF THE 



another heliazoan, to have finally attained the number of 

 one hundred, or whether it is connected with the process 

 of reproduction, I cannot say. It seems to me very proba- 

 ble that, in the fall at least, the full-grown heliazoan 

 becomes encysted, and that its protoplasm then divides and 

 subdivides, until it is converted into a mass of minute 

 bodies, which, when the cyst is ruptured, make their 

 escape into the surrounding water, and then appear as naked, 

 spherical masses of granular protoplasm with a nucleus. 

 It may be that the minute bodies acquire a covering before 

 they escape from the mother cyst, and that they then act 

 as spores, and are carried about and developed similar to 

 the spores of infusoria. 



Of course this mode of development has never been ob- 

 served in the heliazoan, but it seems to me to be very 

 probable that it does occur, judging from the observed 

 young individuals, and from the fact that it occurs in 

 certain infusoria. 



EXPLANATION OF PLATE. 



All the figures were drawn from life except Fig. 24, which 

 is a reproduction of a figure from Dr. Leidy's work on the 

 Rhizopods. Fig. i, which is a heWsLzoau, Ac/z7wsp/taerm?fi 

 Eichhornii^ of the very youngest stage, is in nature 14.5 it 

 in diameter. The other figures are drawn with the same 

 magnification as Fig. i, and hence they all bear the same 

 relative size in nature as is here represented, excepting 

 Figs. 25 and 26, which are a little too small. I take it to 

 be of much more value to the reader to have the figures 

 drawn so as to preserve their relative size, and then to 

 know the natural size of one of them, than it is to have 

 the figures of various magnifications and know the mag- 

 nification of each separate figure. I do not wish it under- 

 stood that the figure taken from Leidy is relatively of the 

 same size as the other figures. 



Trinity College, N. C. 



