512 



■MARSILEACE/E. 



crescent shaped grumous mass, not lobed In this the projections 

 round the base were more evident than I have seen. The granular 

 communication is distinct above, towards the apex of the nucleus be- 

 coming dissolved. The inner wall of the nucleus is likewise cellular 

 in this. 



In both, prolonged maceration caused the base of the nucleus to be- 

 come narrowed, and then in one the basilar projections became more 

 evident. 



Azolla pin NAT a j PI. CXXI. (continued) 



Fig. I. — Bodies anisochromous : in the left one, distinct sphacela- 

 tion, distinct granular communication. Body occupied by enlarged 

 nucleus, towards the middle of which is a yellow sac ; above, it is dis- 

 tinctly grumous having angular nuclei, in a subspiral direction. The 

 yellow sac is separable on pressure, elastic, empty ; grumous angular 

 nuclei floating on grume, escaping with it on pressure. 



The right hand body, is much less advanced, filaments adher- 

 ing, sphacelation slight, and not throughout the cells of the apex, but 

 rather about fie centre, nucleus grumous, with obsolete nuclei to- 

 wards the centre, no vessels prolonged into this. 



In the larger, few if any of the cells of the superfices exhibited 

 nuclei, in the smaller many green ones did. 



The circumference of tha yellow sac is more opaque than the rest, 

 probably from condensing grume. J 



Fig. II. — Tn this, both are distinctly umbilicate : in one are dis- 

 tinctly protruding confervoid filaments ; of this also the commu- 

 nication, funnel, and sac, are verj distinct. In the other there was 

 sphacelation near the apex, and the body was opaque, nothing could 

 be more distinct than the right hand, one. 1-16 £ M. 



Fig. III. — Represents the two bodies of one involucrum, the low- 

 est (in the drawing) less advanced. 



It shows well the general condensation of grume within the nu- 

 cleus, prior to the appearance of the yellow sac. 



Both, especially the upper, shew that the cellular protuberances 

 exist around the base of both nuclei. £ M. 



Fig. IV". — Superficies parallelogramic cellular, cells above the base 

 of nucleus or bag, gorged with pink fluid, below whitish, with a dis- 

 tinct pinkish nucleus, often dark pink, and often very lax. Cells of 



