8 4 



THE FORAMINIFERA 



was surprised at finding no indication, notwithstanding the 

 abundant material at his command, of the formation of a brood of 

 young resembling the parent. On the analogy of the life-history 

 of Polystomella, the absence of such indications appears in no way 

 remarkable, for such a nuclear history is associated, as we have 

 seen, with the production of zoospores. 



The only difficulty in applying this analogy arises from the 

 fact that no indications were found of a form of Saccammina with 



a different nuclear history, 

 corresponding with that of 

 the microspheric generation of 

 Polystomella. 



It is, of course, possible 

 that the microspheric form, 

 although occurring in nature, 

 did not happen to be repre- 

 sented among the specimens 

 examined; but however this 

 may be, it is clear that we are 

 not at liberty to assume the 

 existence of a microspheric 

 form in Saccammina. Hence, 

 in the absence of other evi- 

 dence bearing on the point, 

 the Astrorhizidea cannot at 

 present be admitted into the 

 list of dimorphic Foramini- 

 fera. 



In Haliphysema tumano- 

 wiczii (Fig. 19) Lankester (19) 

 described numbers of " egg- 

 like " bodies, varying in diam- 

 eter from y-Vo- to -g-J-g- inch, 

 scattered through the proto- 



Hyperammina arborescens, Norm, a, two speci- plasm. They appeared to be 

 mens growing attached to a stone, x 20 ; o, initial 1 i 



chamber of another specimen. (After Brady.) nucleated, and, in SOHie CaSCS, 



in process of division. It was 



surmised that they might be concerned in reproduction. Further 

 information on the nature of these bodies would be very accept- 

 able, but the possibility appears not to have been excluded that 

 they are symbiotic or parasitic organisms similar to those which 

 abound in the protoplasm of Orbitolites complanata. 



Via. 18. 



