LOCALIZED STAGES IN DEVELOPMENT. 151 



Phoenix canariensis. 



Fig. 100. Seedliiis with seed in place, .showing elongate character of the simple, early seed-leaf. Compare with 

 older PhoenLx, Fig. 103. X f. P. 124. 



COCOS WEDDELIANA. 



Fig. 101. Pinnate leaf of a young seedling, the terminal leaflet resembles the whole early, .simple leaf. Compare Fig. 

 102. The lateral pinnae near the tip of leaf cling to one another and to the distal leaflet. Reduced. P. 125. 



Fig. 102. Simple uepionic le:if of a young seedling, leaf is entire, elongate with elongate rachis. Reduced. P. 125. 



Phoenix rupicola. 



Fig. 103. See'dling showing simiile leaf 1 , succeeded by compound pinnate leaves 2, 3. The tips of leaves 2 and 3 

 are similar to the whole of leaf 1. The lateral pinnae of 2 and 3 near the end cling to terminal leaflet. X about !,. 1'. 124. 

 Fig. 103a. Rever.se side of leaf 1 of Fig. 103, .showing elongate rachis. P. 124. 



CORTPIIA AUSTRALIS. 



Fig. 104. Simple leaf of young seedling, showing ovate form and elongate rachis. Reduced. Fig. a, reverse side of leaf 

 showing rachis more distinctly. Reduced. P. 124. 



Pteris aquili.va. 



Fig. 105. Young plant; the frond is entire di.stally, becoming progressively more divided proximally. Dutted line 

 represents the surface of soil. West Chop, Martha's Vineyard, Mass. Slightly enlarged. P. 126. 

 Figures 93-104 from plants in cultivation. 

 Fig. 105 drawn by the author; others by Mr. J. II. Emerton. 



PLATE 24. 



frAr.AXEA CAKSI'ITOSA. 



Fig. 100. Young bud from coenenchyma of adult colony, showing only si.x septa. Xl2. P. 127. 



Fig. 107. Older bud. The fii'st six septa have grown and six additional septa have appeared. Xl2. P. 127. 



Fig. 108. Still older bud, all the twelve septa of Fig. 107 have grown and the six oldest are reiire.sented by c^ostao 

 externally. X8. P. 127. 



Fig. 109. Fully grown zooid, the twelve septa of Figs. lOil-lOS have grown and fused centrally. Aihlilional tertiary 

 septa occui' between the primary and secondary septa. These tertiary septa are in the condition of development represented 

 by the primary septa of Fig. 100 and the secondary septa of Fig. 108. X8. All the polyps. Figs. 100-109, are from a single 

 large specimen in the collection of the Bost. soc. nat. hist. P. 127. 



ArbACIA rUNCTULATA. 



Fig. 110. Interandjulacrum of a young specimen (23 mm. in diameter) having eleven plates in the columns. Plate 11 

 has no spine boss, plate 10 has one, and plate 6 has two bosses. Compare with plates 11, 10, 6, of Fig. 111. Wood's IIoll, Ma.ss. 

 X3. p. 130. 



Fig. 111. Interambulacrum of adult specimen (measuring 45 mm. in diameter), having 14 plates in columns. Plate 14 

 is smooth, plate 13 has one spine boss, plate 10 has two spine bosses. Compare with plates of Fig. 110. Wood's HoU, Mass. 

 X3. p. 130. 



