566 



MARSILEACEiE. 



PI. CXXI. f. V. A pair rather more advanced : the membrane 

 of the (yellow) sac is now being developed : 

 to the right hand one confervoid filaments 

 are seen adhering, 

 f. VII. Do. do. still more advanced : this is intended 

 to represent that step of the development 

 when the (yellow) sac is crowned with a 

 cap of grume, presenting numerous condens- 

 ed points, or nuclei. 



PI. CXX. f. V. Another pair still more advanced, under slight 

 pressure: the grains (disconnected joints of 

 the filaments) have almost disappeared, a 

 membrane is developed round the condens- 

 ed points, (or nuclei :) the yellow) sac is 

 collapsed accidentally. 



PI. CXIX. f. III. 2. Represents the (yellow) sac and its crowning 

 mass detached, parts displaced : (yollow) 

 sac collapsed. Intended to shew that there 

 are more membranes developed in the crown- 

 ing grume than there are subsequent lobes, 

 there being in this, on one surface, no less 

 than 7. 



PI. CXX. f. V.,c (Yellow) sac and capping grume with its con- 

 densed points, at a stage intermediate be- 

 tween fig. 6 and 7. 

 „ f. V.,a. (Yellow) sac alone. 



„ f. V.,/. The same, burst on the trilincal-marked sur- 

 face. 



PL CXXII. f. I.,l v . Lower persistent parts of a pair of calyptrate 

 capsules. 



„ f. I.,2. Contents of one of the same, as they sepa- 

 rate with the calyptra. 

 „ f. I. ,3. Calyptra detached. 



„ f. I.,4. Contents without the calyptra, to which they 

 adhere by the cup-shaped mass of radicello- 

 fibrous tissue at the apex : niicleary mem- 

 brane (or secondary capsule) removed. 



„ f. I.,5. Contents without the calyptra, and without 



