196 NAIADES. 
Zanichellia continued Pl, CCLVI. Fig. II. 
1. Young Carpella; 2 its ovulum, а foramen, 6 testa, c 
embryonary sac, or nucleus lined by that sac, d funicle, 
e embryo. 3 embryo detached. 
4. More advanced ovule, the same figures have the same 
references, embryonary sac more distinct, but scarcely 
demonstrable. 5 embryo. 
6. Half matured, the same figures have the same references, 
7. embryo. 
8. More advanced : 
9. Embryo, at а Plumule situs. 
10. Complete embryo, 10 a Do. fronts view, 105 Do. long 
section, shewing the 2 leaved plumule. 
RUPPIA. 
Ruppie sp. CCLVII. Planta aquatica in massis intricatis, 
gracilis, fucoidea, dichotoma. 
Folia cylindraceo-planiuscula e basi dilatata longe atte- 
nuata, acutato-cuspidata pallide viridescentia. Structura, e 
canaliculis 2, initio septis transversis interruptis septo longi- 
tudinale centrale interposito. 
ille, folia alia gignunt bina? vel una quorum interius 
junius in parte inferne membrana stipulacea involvitur. 
Spadix terminalis e partibus dilatatus fol. 2 terminal. sub- 
opposita vix exserta, subclavata 2-4 linealis. 
Spatha plana spathulata structura vaginarum apice ple- 
rumque denticulata. 
Flores in spadici sessiles, numero semper 2, inconspicui om- 
nino nudi. 
Stamina 4 in spadice sepius transverse sita, brunnescentis. 
Anthere sessiles oblongi uniloculares rima centrali quoad 
axin : transversa dehiscentes cellule fibrosze sub o. 
Pollen singulari forma, magnum oblongum curvatum, sub- 
reniforme e vesiculo e plicato, e perforato translucido globulos 
