Further Observations with the Electron Microscope on Spermatozoids in the Brown Algae

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Abstract
Observations are recorded for Ascophyllum, Pelvetia, Himanthalia, and Dictyota in addition to Fucus which has already been described in a previous paper. Fibrillar disintegration of cilia has been obtained in all except Pelvetia , in each case to give nine peripheral strands and a central pair. This corrects a previous error for the hind flagellum of Fucus . Some facts are given regarding the internal organs associated with the parts of the cilia inside the body in Himanthalia and Dictyota . A proboscis similar to that previously described for Fucus has been demohstrated in Ascophyllum and Pelvetia , but is absent from Himanthalia and Dictyota . Himanthalia differs from the other Fucoids in the relative lengths of front and hind flagella. Dictyota has only a single flagellum. In all, the front flagellum is a Flimmergeissel with two rows of hairs, which, in certain cases, notably Himanthalia ; have very long hair points. In Himanthalia there is a large spine near the distal end of the front flagellum borne on one fibril of the peripheral series. In Dictyota there is a row of smaller spines at the front end of the flagellum borne in a line between the two lateral rows of hairs. These spines in Dictyot can be used as evidence regarding the internal symmetry of the whole cilium which is summarized in a diagram.

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