British Marine Algae . 
321 
Tellamia intricata, Batt. Figs. 15-17. 
Fig. 15. Young plant showing the mode of branching. x6oo. 
Fig. 16. Fertile frond. X1500. 
Fig. 17. Section of the periostracum of Littorina obtusata, L. with Tellamia 
intricata filaments, x 500. 
Tellamia contorta y Batt. Figs. 18-24. 
Fig. 18. Early stages in the development of T. contorta. X150. 
Figs. 19-21. Stages in the development. X500. 
Fig. 22. Portion of periostracum of Littorina with T. contorta seen from above. 
X300. 
Fig. 23. Portion of the frond showing the horizontal branching and the enlarged 
cells, x 500. 
Fig. 24. Section of the periostracum of Littorina with T. contorta filaments. 
X500. 
Callocolax neglectus , Schmitz. Figs. 25-29. 
Fig. 25. Plant natural size in situ. 
Fig. 26. Tetrasporic frond in situ. X20. 
Fig. 27. Portion of the same, x 100. 
Fig. 28. Transverse section of a cystocarp. X20. 
Fig. 29. Section through frond where it is united with the host-plant, x 200. 
Hymenoclonium serpens , Batt. Figs. 30, 31. 
Fig. 30. Portion of a frond seen from above, x 100. 
Fig. 31. Tip of a frond showing chromatophores. x 700. 
