. Transactions and proceedings of the New Zealand Institute . t the truncations,edges smooth. End view circular. This plant is remarkable for its pecuHarhour-glass shape. I have found no description of anything like it in suchbooks as have been accessible to me. If it prove a new species I should pro-pose the name of C. clepshydra. Fig 7. Staurastrum, sp. ? Edges of frond smooth, segments united below,divaricating. Upper and outer borders concave, uniting at an acute angle,inner slightly convex, lower rounded. On the upper concave border arethree hyaline processes with smooth sides and flatten
. Transactions and proceedings of the New Zealand Institute . t the truncations,edges smooth. End view circular. This plant is remarkable for its pecuHarhour-glass shape. I have found no description of anything like it in suchbooks as have been accessible to me. If it prove a new species I should pro-pose the name of C. clepshydra. Fig 7. Staurastrum, sp. ? Edges of frond smooth, segments united below,divaricating. Upper and outer borders concave, uniting at an acute angle,inner slightly convex, lower rounded. On the upper concave border arethree hyaline processes with smooth sides and flattened ends. At junctionof outer and lower borders is one process similar to the upper ones butcurved slightly outwards. This little plant is unlike anything in Ealfs—it might be an unusual form of S. lave, but in the latter the processes areforked, in the former not. Fig. 8. Closterium. In this genus I have not found any specimen that could notbe referred to Ealfs. * Trans. Inst., vol. xiii., art. xxxviii., pp. 297—317. ,, ^CZJO ,?f >Sj}e7ZC/r. del. Ml MS//WMH JIC£ Spencer.—On the Fresh-water Alg® of Neiv Zealand. 297 Pediastrum tetras, and P. heptactis are both common. ,, pertusum. Intestines of the frond hyahne; some of the inner cells are gone, therefore the foraminal appearance is uncertain. Therectangularity of the outer row of cells and the shape of the notch point topertusum. On the other hand, the number of rows, and the number ofcircumferential cells, might lead one to infer a new species. On carefulcomparison, however, I am inclined to consider it as an unusually largespecimen of P. pertusum. Number of rows, five; number of cells in innercircle, five. The two next rows are broken down. The fourth circle con-tains apparently eighteen, and the outer one—the fifth—twenty-one 9. Pediastrum., Frond square, divided into four equal lobes by acrucial hyaline division. Lobes divided into segments by a deep narrown
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