100 Howe: Notes on Bahaman algae 



Explanation of plate 6 



Figs. I and 2. Coccodachis occidentalis laxits ; 3- ! 2, Neomeris Cokeri. 



1. One of the whorled branches of Coccocladus occidentalis laxus, with sporangia, 

 X12. 



2. A single sporangium, X 4°- 



3. Neomeris Cokeri, natural size. 



4. A single plant, X 8. At the apex, in this individual, is a zone of multicellular 

 hairs, surrounding and concealing the apiculum formed of the mantle caps ; below, are 

 the unicellular hairs, and farther downward, the lime-coated sporangia, isolated, or co- 

 herent in short rows. 



5. Apical portion of another plant, X I2 - The hairs in the apical region are here 

 of the unicellular kind and the apiculum formed of the mantle-caps is conspicuous ; 

 below is a zone of multicellular hairs. 



6. A fertile primary branch, with branches of the second order, each, in this case, 

 bearing a unicellular hair, X 4°- (Decalcified.) 



7. A similar fertile primary branch, X 4°- (Decalcified. ) 



8. A fertile primary branch, with branches of the second order, each, in this case, 

 bearing a multicellular hair, X 4°- (Decalcified.) 



9. The conditions in this figure are similar to those represented in Fig. 8, except 

 that only the basal cells of the multicellular hairs now persist. Scars remain indicating 

 the places of insertion of the hair-segments which have fallen. In this stage the two 

 forms of hairs sometimes resemble each other, but the persisting bases of the multicel- 

 lular may be recognized by the presence of these scars, which are always entirely 

 wanting on hairs of the unicellular kind. 



10. Part of a primary whorl, with sporangia and branches of the second order, 

 X 40, with calcareous coating. 



11. A single primary branch, with sporangium and branches of second order, with 

 calcareous coating, X 37- 



12. A mature spore, within the sporangium, decalcified, X 53- 



The drawings have been made by the writer, with some assistance from Mr. A. 

 Mariolle in preparing them for reproduction. 



