FEXNS. 



267 



These are the an- 



tered over this portion of the prothallium. 

 theridia. If the pro- 

 thallia have not been 

 watered for a day or 

 so, we may have an 

 opportunity of see- 

 ing the spermato- 

 zoids coming out of 

 the antheridium, for 

 when the prothallia Fig 306. 



Section of anthendia showing sperm cells, and spermato- 



are freshly placed in >ids in the one at the right. 



water the cells of the antheridium ab- 

 sorb water. This presses on the con- 

 tents of the antheridium and bursts the 

 cap cell if the antheridium is ripe, and 

 all the spermatozoids are shot out. 

 We can see here that each one is 

 shaped like a screw, with the coils at 

 But as the spermatozoid 



in A ifuict I < (I IU I L I I Ml - '" v*Nfvrw 



(Adiantum concinnum). 



what and by the vibration of 

 the long cilia which are on the 

 smaller end it whirls away. In 

 such preparations one may often 

 see them spinning around for a 

 long while, and it is only when 

 they gradually come to rest 

 that one can make out their 

 form. 



557. Archegonia. If we now 

 examine closely on the thicker 

 part of the under surface of the 

 prothallium, just back of the 

 -sinus," we may see longer vent^fteTgg! next is 

 stout projections from the surface n^ieUf the SnafSl. f 

 of the prothallium. These are shown in fig, 297. They are 



Fig. 307- 



Different views of spermatozoids; first close, 

 in a quiet condition; in motion 



begins to move this coil opens some- 



