518 



MARSILEACEJE. 



1. Is the contained body ; their is a small attaching ? process to 

 the centre of the three apical teeth. 



c. Vertical view of its apex, shewing the trilineal mark, and its si- 

 tuation with regard to the teeth. At this time the incrusting is 

 all minutely granular, or at most a few seeming cells in it. 



d, d. The same body more advanced, the granular incrustation 



is now pseudo cellular, owing to the cavities containing oil? 



Salvinia verticiclata, PI. CXXIV. (Continued.) 



Fig. I. — 1. Mature oblong capsule. 



2. Long section. 



3. Secondary capsules (group of) removed. 



4. Long section of contents of one of the secondary capsules. 



5. Transverse do. 



6. Part of the contents of yellow sac. £ 



Fig, II. — a. Represents an ovulum very young \ M. 



1. 2. Represent two stages of the same young capsule. 1-16. 



In the upper (least developed) grume at first homogeneous ; after 

 slight maceration in water, it appeared as if an angular grumous nu- 

 cleus was forming in the centre, and after this as if there was a 

 large parent cell 4 lobed in the centre. This however disappeared 

 after it had been in dilute tincture of iodine sometime. 



The other shews the mode of formation of the trifacial and cen- 

 tral cells, it does not shew the parent cells, they being excessively 

 faint, but existing between the periphery, and the (abortive spores) 

 central, nearly detached cells. 



Fig. III. — 1. Oblong reproductive bodies of Salvinia verticillata 

 £ M. A few trifacial cells still to be found in the grume which 

 is fluid : this perhaps represents the formation of the three 

 teeth ending the incrustation. This presents an analogy with 

 capping process of Azolla. Middle in focus. d 



2. Yellow sac of the same capsule detached, common, but of a 

 less advanced body, trifacial line in focus. 



3. The same, middle in focus, shewing the cellular appearance- 

 Fig. IV. — 1. Mature capsule. 



2. The same naturally open. 



