Howe: Phycological studies 101 



3. Apical portion of a young plant before the beginning of cortication. 



4. A portion of a plant in a similar young stage, showing the widely spaced divari- 

 cate or somewhat recurved primary whorls. 



5. Five members of a somewhat younger whorl, showing form of the primary 

 branches, their calcification, etc. 



6. Parts of two whorls of a later stage, viewed from without, indicating the cal- 

 careous sheaths of the primary branches ; the branches of the second order have fallen 

 and the ends of the primary branches have to some extent collapsed and drawn away 

 from the enclosing lime-tubes. 



7. A portion of the cortex of adult stage in surface view. In the two upper rows 

 the entire surface is calcified except the hair-scars ; below, the superficial crust of lime 

 has partly flaked off, leaving the surface of the plant more or less reticulate-alveolate. 



8. A primary branch, with sporangium, decalcified. 



9. Branches of the first and second orders of adult condition, in lateral view, de- 

 calcified, with sporangia ; the sketch gives a suggestion of the oblique plane in which 

 each pair of corticating branches lies, 



10. A portion of the surface of the adult condition, decalcified, showing form and 

 arrangement of the corticating inflations. 



11. A portion of an older part of the cortex, decalcified, showing a less regular 

 form and arrangement of the corticating elements. 



12. Two calcified sporangia from the same whorl in proximal view, showing posi- 

 tions of the pedicels of the two corresponding pairs of corticating branches, 



13. Parts of two whorls of sporangia, calcified, in distal view, showing their form, 

 mutual relations, and the positions of the pedicels of the corresponding pairs of corti- 

 cating branches. 



14. A part of an adult fertile whorl, the shading indicating the distribution and 

 extent of the calcification. 



Figures I-4, 7-12, and 14 are drawn from the type material (Atwood Cay, Ba- 

 hamas, Howe 3308) ; 5, 6, and 13 are from no. JJ48 (Cockburn Harbor, South 

 Caicos). Figures I, 3, and 4 are enlarged 28 diameters; 2, and 5-^4, 4^ diameters. 



15 and 16. Neomeris stipitata 



15. A primary branch of adult fertile condition, bearing two secondary (corticat- 

 ing) branches, decalcified. 



16. One of the not uncommon primary branches that bear three secondary (corti- 

 cating) branches, decalcified. 



Both figures are enlarged 40 diameters, 



17-19. Neomeris van Bosseae 



17. Portion of the decorticated surface of adult plant, showing the tips of the 

 mutually free calcified primary branches. (The tips should be distinctly in pairs more 

 often than the drawing indicates, for the stumps of the broken-off secondary branches 

 often persist and show on the surface as independent tubes). 



18. A single primary branch, with its lime-coating. 



19. Portions of two primary branches, loosely coherent by the intercalary lime. 



Figu 



IVeber 



Islands by W. H. Harvey. Figure 17 is enlarged 40 diameters; 18 and 19, 55 



diameters. 



