RUPPIA. 201 
8. Carpellum. 8а inner face, skewing the suture, 84 long 
section. 8c Ovule. 84 long section. 
9. Spadix after impregnation; ovaria variously enlarged, 
some remain unchanged, 
11. More advanced, embryo very oblique. 
Ruppia CCLVII. 
1. Plant natural size. 
2. Young spadix sometime before exsertion. 
3. Very young spadix, shewing incomplete involution of 
spatha. 
4. More advanced; а, spatha ; 5, outer leaf of axilla; e, 
inner ditto always provided with a sheath; a, c, sheath ; 
d, outer leaf of opposite axilla without one; o marks 
of exsertion of perigonial leaves. 
5. Spadix, 8 spatha young. 
6. Ditto nearly mature. 
Ruppia, Pl. CCLIX. 
1’, Ovule before impregnation, 1 testa, 2 tegumen, 3 fora- 
men, 4 cavity excavated in nucleus, 5 hilum. 
2’. Ovule after impregnation, 1 teguments, 2 foramen ; 
both teguments here seen, but no mammilla of nucleus 
which presents a rounded uniform margin. 
3’. Ovule more advanced, foramen very lateral. 
4’, More advanced, 4a Foramen viewed in front. 
5’, Ovule more advanced, 1 hilum, 2 foramen mammillz of 
both teguments seen but none of nucleus, 3 testa, 4 
tegument, 5 nucleus, lined and rendered turged by em- 
bryonary sac, 6 globular cell attaching the embryo, 7 
embryo. 
6'. More advanced, same figures have same references, 8 
commencement of cotyledon. 
7’. More advanced, same references, 9 projection shewing 
situation of plumula. 
A2 
