56 



cylindric colls tapering somewhat in both ends grow up. These 

 long cells, the stalks in the full grown plant, have quite even walls 

 and have no annular constriction at their base. They are often 

 ramified. 



When the stalk has reached a certain degree of development 

 the cell contents are densely accumulated in the top of the cell 

 and then divided into a number of cells (Fig. 39 a). This division 

 takes place by segregative cell-division and so far I have been 

 able to see quite in the same manner as in the above-mentioned 

 species. In spite of the fact, that I have had a fairly large mater- 

 ial I have nevertheless only found very few cells in the first stages 

 of development, most probably because the division of the cell 

 contents takes place very quickly. One of the youngest stages 

 I have seen is shown in Fig. 39 a. We see here that 5 cells are 

 formed, a larger cell below which is always found here at the 

 base of the frond and 4 smaller cells above it. 



Fig. 39 b shows a somewhat more advanced stage of devel- 

 opment, the side-branches of first order here beginning to grow 

 out from the cells in the stalk. This mode of growth is quite in 

 accordance with that in the above-mentioned species and on the 

 whole the ramification takes place in the same way as in Striwea 

 elegans, only not quite so regularly. 



As to the cell contents the plate-shaped irregular polygonal 

 chromatophores (Fig. 39 /) form a net-work in the wall plasma. 

 In each chromatophore a large pyrenoid is present and under 

 the chromatophores the numerous nuclei are arranged rather 

 regularly. In the rhizoids much starch is often accumulated. 



In some specimens I have found the cell contents in a great 

 number of the cells in the frond congregated in larger and smaller 

 balls, some few in each cell, most probably an aplanospore for- 

 mation. 



This species occurs in shallow water often in rather exposed 

 localities. 



It is found, St. Thomas: m the Harbour and in the Great North- 

 side Bay on the north side of the island; St. Croix : Christianssteds Harbour. 

 Geogr. Distrib. Seems to occur in all warmer seas. 



Chamaedoris Mont. 



Chamaedoris Penicuhim (Sol.) O. Kuntze. 

 KuNTZE, O., Revisio generum plantarum, Pars III, 1893, p. 4i)0. 

 BoRGESE.N, F., in Botanisk Tidsskrift, vol.32, 1912, p. 270. 



Corallina Peniciilum Solander in Ellis, The Natural History of many 



