340 Transactions of the Society. 



suggests,* but with a complete capsule instead of a platy one, 

 what is the nature and function of the enveloping capsule-wall as 

 seen in Sporocarpon ? On the other hand, there is some ground 

 for thinking with Williamson, that they are the reproductive 

 capsules of certain marine vegetable organisms. In both cases we 

 would therefore assume that in regard to the included bodies found 

 in Sporocar2Jon they are only similar in form, but widely different 



m origin. 



* Phil. Trans., vol. clxxi. 1880, p. 525. 



