Ecological and systematic studies of Ecological and systematic studies of the Ceylon species of Caulerpa ecologicalsystem00unse Year: 1906 134 CEYLON MARINE BIOLOGICAL REPORTS. However it is evident that the most important difference between C. peltata and C. nummtdaria lies in the structure of the shoots. An examination of both Harvey's original types and others shows that nummularia always has this mode of growth and the accompanying structure of the shoots. That also an occasional crenulate disc can be met with seldom is true, but this contributes much less to its character than the mode o
Ecological and systematic studies of Ecological and systematic studies of the Ceylon species of Caulerpa ecologicalsystem00unse Year: 1906 134 CEYLON MARINE BIOLOGICAL REPORTS. However it is evident that the most important difference between C. peltata and C. nummtdaria lies in the structure of the shoots. An examination of both Harvey's original types and others shows that nummularia always has this mode of growth and the accompanying structure of the shoots. That also an occasional crenulate disc can be met with seldom is true, but this contributes much less to its character than the mode of growth itself. The diameter of the assimilation discs varies, but can be said not to exceed 5 mm. It must be observed that the big and splendid G. macrodisca, which is included by Weber v. BossB as a variety of peltata, seems to have quite a different mode of growth. It has not procumbent branches with all the assimilation discs on one level, but it seems to correspond in its mode of growth with peltata. It also seems to grow in deeper water, since Weber v. Bosse mentions that she had 'dredged' it at the mouth of the Maros river, which may point to the fact that it does not belong in every case to the uppermost part of the littoral zone. Geographical distribution.—Ceylon : in the upper part of the httoral zone on rocks and amongst corals, in many places, at least on the south-west coast, but ocemring in large quantities ; thus, around GaUe (in many places on the reef and rocks north-west of Victoria Park, but also amongst the Madrepores below the Utrecht Bastion, and on stones at Watering Point) ! Indian Ocean ; Australia; Pacific (Friendly Islands).
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