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EXPLANATION OF PLATES V AND VI. 
Illustrating Miss Gibbs's paper on the Seed of the Alsinoideae. 
PLATE V. 
Fig. 1. Stellar ia uliginosa. Exceptional case of megaspore cutting off tapetal cell : in. mega- 
spore ; t. tapetal cell, x 1100. 
Fig. 2. Stdlaria uliginosa. Tapetal cell showing further anticlinal division : in. megaspore ; 
t. tapetal cell ; ax. c. axile cell-layer of nucellus. x xioo. 
Fig. 3. Arenaria trinervia. Enlarging megaspore : in. megaspore; ax. c. axile cell-layer of 
nucellus ; ep. epidermis, x 450. 
Fig. 4. Stellaria Holostea. Epidermis showing increased anticlinal divisions at apex of 
nucellus : m. megaspore ; ax. c. axile cell-layer of nucellus ; ap. nuc. apex of nucellus. x 1100. 
Fig. 5. Cerastium glomeratum. First division of embryo-sac nucleus : e. s. embryo-sac ; ax. c. 
axile cells, x 1100. 
Fig. 6. Stellaria media. Ovule with embryo-sac showing two polar nuclei : e. s. embryo-sac ; 
00s, oosphere ; syn. synergidae ; p. n. polar nuclei ; ant. antipodals ; ax. c. axile cell-layers of 
