F. Borgesen: Rhodophyceæ of the Danish W. Indies. 359 



At the surface on both sides of the flat thallus we find a cortical 

 layer composed af small roundish cells of somewhat variable size. 

 Below this tissue a layer of large cells follows. These cells are of rather 

 variable shape, often with long prolongations. The innermost cells 

 facing the cavity in the interior of the thallus, have often several 

 prolongations becoming more or less regularly stellate of shape (Fig. 

 3536). From these cells longer nearly cylindrical cells or shorter oval 

 ones forming shorter or longer chains issue connecting the cell- 

 layers of both sides. 



How far this plant is rightly referred to the genus Kallymenia 

 seems to me rather problematic. Its anatomical structure, at any 

 rate, is not much hke that found in the Fam. Gigartinaceæ, and it 

 shows much more hkeness to that occurring in forms belonging to 

 the Rhodymeniaceæ, e. g. Chrysymenia, to the flat forms of which 

 it bears a close resemblance. Nevertheless until fructiferous organs 

 are found 1 think it preferable to let it remain in the genus 

 Kallymenia which according to Schmitz (in Engler u. Prantl, Nat. 

 Pflanzenfam. Teil I, Abt. 2, 1897, p. 365) contains forms most prob- 

 ably belonging to several different genera. 



The specimens were all sterile; they were dredged only in deep 

 water (about 30 meters) in places where strong currents prevail and 

 found attached to other algæ, stones etc. 



St. Jan.- In the sound between this island and St. Thomas near 

 Gr. St. James, and near Maria Bluff, Whistling Gay. 



Geogr. D i strib.: Ceylon, West Indies. 



Fam. 2. Uhodophyllidaceæ, 

 Subfam. 2. Cystoclonieæ. 

 Catenella Grev. 



1. Catenella Opuntia (G. et W.) Grev. 



Greville, R. K., Algæ Britannicæ, 1830, p. 166. pi. 17. Harvey, 

 Manual, p. 51; Phycologia Britannica, pi. 88. Agardh, J., Spec. Alg., vol. 

 II, p. 352; Epicrisis, p. 588. 



Fucus Opuntia Good, et Woodw., Observations on the Brit. Fuci in 

 Linn. Trans. Ill, p. 219. Stackhouse, J., Nereis Brit., p. 42. Turner, 

 Fuci, pi. 107. 



Catenella pinnata Harv., Nereis Bor. -Am., p. 201, pi. 29 5. 



This small plant was found a few times in lagoons growing upon 

 the roots of the mangroves to which it fixes itself by means of haptera 



