The Antherozoids of Dictyota and Taonia. 
BY 
J. LLOYD WILLIAMS, 
Demonstrator in Botany in the University College of North Wales. 
With Plate XXV. 
^'PHE antheridia of Dictyota dichotoma (Huds.) Lamour. 
.1 were first described by Thuret h The paper is accom- 
panied by excellent figures of the antheridia in various stages 
of development. With regard to the antherozoids he states 
that when they are liberated ‘ they spread out in the water 
in the form of hyaline globules like the spermatia which 
escape from the antheridia in the Florideae and they seem, 
like them, non-motile,’ Crouan 1 2 professed to have seen 
motile gametes (called by him sporidia) in Halyseris polypo- 
dioides , Ag., but his description evidently applies to the 
oospheres and not to antherozoids. Thuret also expressed 
disbelief in the truth of his statement. Reinke 3 has given 
detailed descriptions of the genera Dictyota . Padina , Taonia 
and Zonaria. He confirms the statement of Thuret with 
1 Ann. d. Sci. Nat., 4° ser. Bot., t. Ill, 1855. 
2 Bull, de la Soc. Bot. de France (1855), t. II, p. 444. 
3 Nova Acta Leop. -Carol., Bd. XL, 1878. 
[Annals of Botany, Vol. XI. No. XLIV. December, 1897.] 
