102 Howe: Phycological studies 



20. Neoi7ieris dumetosa 

 Portion of the decorticated surface of an adult plant, showing the coalescence of 

 the primary branches and intercalary lime-deposits into transverse scales. The figure 

 is enlarged 40 diameters and is drawn from a fluid-preserved specimen collected on the 

 island of Fau, Dutch East Indies, by A. Weber-van Bosse. 



Plate 6 

 I and 2. Neomeris dumetosa 



1. A scale formed by the coalescence of five primary branches and the intercalary 

 lime-masses; from Fau, Dutch East Indies [^A. Weber-vati Bosse). 



2. A similar scale from a presumably authentic specimen in the Museum d' His- 

 toire Naturelle of Paris (see Plate l, Figure l). 



P'igures i and 2 are enlarged 55 diameters. 



3-12. Ilalimeda lacrititosa 



3. Utricle of the subcortical layer, bearing six peripheral utricles. 



4. Utricle of the subcortical layer, bearing twelve or more peripheral utricles. 



5. Utricle of the subcortical layer with about twelve peripheral utricles. 



6. Peripheral utricles in surface view, decalcified, the dotted lines indicating the 

 form and position of the utricles of the subcortical layer, which are often clearly vis- 

 ible through the peripheral utricles. 



7. Utricle of the subcortical layer of characteristic form, bearing probably twelve 

 peripheral utricles, the latter showing incrassate outer walls. 



8. Utricle of the subcortical layer, bearing fourteen peripheral utricles, the latter 

 with only slightly thickened outer walls. 



9. Filament from central strand of node, showing complete fusion of two filaments 

 to form one. 



10. Filament from central strand of node, showing complete fusion of four fila- 

 ments to form one. 



11. Filament from central strand of node, shovving complete fusion of three fila- 

 ments to form one. 



12. Filaments from central strand of node, showing complete fusion of eight fila- 

 ments to form four which, at their point of origin, are incompletely fused into one. 



All the figures are drawn from decalcified type-material (Mariguana, Bahamas, 

 Ho7ve 3524). Figures 3-6 and 9-12 are enlarged 40 diameters; 7 and 8, 150 

 diameters. 



13-15. Acetabulum pusillum 



13. Bases of four sporangia from above, showing the coronal processes, each with 

 two hairs or hair-scars. 



14. Base of a single sporangium in lateral view, showing coronal process, etc. 



15. Base of a sporangium from above, showing the coronal process with three 

 hairs or hair-rudiments. 



Figures 13 and 14 are drawn from the type material (Montego Bay, Jamaica, 

 Howe 302ga') ; 15 is from no. §433 (Mariguana, Bahamas). All of the figures are 

 enlarged 150 diameters. 



1 6-20. Acetabulum polyphysoides 



16. Base of sporangium from above, showing coronal process with twelve hairs 

 (including rudiments and scars). 



17. Bases of sporangia of common form, showing coronal processes with nine and 

 ten hairs (including rudiments and scars). 



