106 MORPHOLOGY AND LIFE HISTORY 



many on each hair? Observe their contents, 

 the sperms (antherozoids, spermatozoids). 

 (d) Make a drawing at least 50 mm. in longest 

 diameter, illustrating all the above structures. 



3. The Female Conceptacles: 



(a) Study a longitudinal section passing through 

 a female conceptacle, as directed above 

 (G, 2). Compare them in all points with 

 the male conceptacles. 



(b) Observe the egg-bearing organs, ob'gonia. 

 Describe their shape, size, color, place and 

 mode of attachment, and number, and 

 compare them in these respects with the 

 antheridia. 



(c) Describe the structure of the wall of the 

 oogonium, noting especially whether it is 

 composed of cells. 



(d) Study the contents (oospheres, or eggs) of 

 the oogonium. How many are there? 



(e) Make drawings showing all these points, 

 as directed in G, 2 (d) . 



4. The Fertilization of the Egg: 



(a) Observe fresh plants that have been hang- 

 ing in the air for about six ' hours, and see 

 if you can observe an orange-colored fluid 

 exuding from the ostioles of the male con- 

 ceptacles. If so, mount some of this fluid 

 in sea-water and examine it under the high 

 power. 



(b) Note the antheridia floating about, and the 

 escaped sperms. Do the latter possess the 

 power of locomotion? If so, how do they 

 move? Describe their shape, relative size, 

 and color. 



