. Ecological and systematic studies of the Ceylon species of Caulerpa. Marine algae. 120 CEYLON MARINE BIOLOGICAL REPORTS. Finally, with regard to the plant named C. fissidentoides (Ferguson, Ceylon Algae No. 161) in the Peradeniya Herbarium its determination is quite impossible, owing to its insignificance and poor condition. It seems to be closely related to such a form as C. plumulifera on PI. XXXI, fig. 2 (but not fig. 3) in Weber v. Bosse's Monograph. On the other hand, it also seems to be very hke C. Freycinetii var. pectiiiata (PI. XXVI., fig. 3) and especially the specimens of this for
. Ecological and systematic studies of the Ceylon species of Caulerpa. Marine algae. 120 CEYLON MARINE BIOLOGICAL REPORTS. Finally, with regard to the plant named C. fissidentoides (Ferguson, Ceylon Algae No. 161) in the Peradeniya Herbarium its determination is quite impossible, owing to its insignificance and poor condition. It seems to be closely related to such a form as C. plumulifera on PI. XXXI, fig. 2 (but not fig. 3) in Weber v. Bosse's Monograph. On the other hand, it also seems to be very hke C. Freycinetii var. pectiiiata (PI. XXVI., fig. 3) and especially the specimens of this form from Koh Kahdat (Gulf of Siam) collected by JoHS. Schmidt (No. 108) determined by Weber v. Bosse and now in the collections of the Botanical Museum at Copenhagen. Geographical distribution.—Ceylon : Pearl Banks in the Gulf of Mannar (/. typica) collected by J. HoRNELL! South India ; Tuticorin (/. tuiicorinensis) collected by Ferguson (Ceylon Algaj No. 413) ! Indian Ocean : Pacific Ocean. 9.—CAULERPA CLAVIFERA (Turner) C. Agardh. C. Agardh, Species iygarum, p. 437. J. G. Agardh, Till. Alg. Syst. I., p. 36. Syn. C. racemosa v. clavifera. Weber v. Bosse, Monographie des Caulerpes, p. 361. Exsicc. WiTTROcK ET NoRDSTEDT, iUga- exsiccatae Ferguson, Ceylon Alga) f. macrophysa (Kiitzing), Weber v. Bosse, loc. cit. f. remota. The vertical axes and also the stalks of the branchlets more or less elongated ; the branchlets separated by rather long intervals (fig. 14). This form grows in deeper water. Caulerpa clavifera is the most common Caulerpa in Ceylon. It occurs in somewhat different localities both on rocks and amongst corals, but especially amongst the latter, on both sheltered and more exposed places AmcMigst corals, on spots with rich supplies of changing water it seems to reach its highest development, and it seems to be one of the very few algae which can grow together with living corals and Actinians. It grows in rather large tufts (fig. 13) with the horizo
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