887 
SOME OSCILLARIOIDEA FROM THE PLANKTON. 
By W. West, Jun., B.A. 
(Pruate 400.) 
In most of the collections made by Messrs. Murray and Blackman 
during their voyage to the West Indies on the ‘ Para’ in 1897, there 
were several species of this group. They did not occur with any 
great regularity over the whole track, sometimes one or the other 
predominating. 
TricHopesmium Tarmsaurm Gomont, ‘Essai de classification des 
a egienss homocystées,’ in Morot, Journal de Botanique, iv. 356 
(1890). Diameter of trichomes 7-12 »; length of articuli 9-22 
Most of the specimens seen resembled tie fig. 4 (Monogr aphie 
des Oscillariées, pl. vi.) rather than his fig. 
Canary Islands (TAwaittes) ; iste (Thiébaut). 
OscILLATORIA baa Crouan, in Desmaz. Pl, eryptog. de 
France, 2e série 7 (1858). Diameter of trichomes 38-43 p; 
length of parses eaulle 4:5-8'7 » (rarely 11-12). The great 
majority of the specimens seen were not in any way torulose 
Hab. coast of France (Debray, Thuret, Crowan) ; and shores 
of the Adriatic (Hauck). 
O. mrintata Hauck, Die Meeresalgen Deutschlands und Oesterreichs, 
508 (1885) ; Gomont, Monographie des Oscillariées, 236 (1898). 
Diameter of trichomes 14-19°5 yw; length of articuli usually 5°5- 
9°5 (rarely 9°5-11) p 
b. The Livin (Zanardini, Hauck); Guadeloupe (Mazé ¢ 
Schramm). 
O. nicro-viripis Thwaites . Sears Phycologia Britannica, 
Synopsis, p. Xxxix, no. 875, pl. 251, A (1846-1851) ; Gomont, bees 
237, pl. 6, fig. 20 Lae: biuaer of trichomes 7-10°2 p ; len ngth 
of artieli 4— nk 
‘ atiand (Batters); France (Le Jolis, — Crouan, 
Flahault) ; Tacs (Agardh, Hauck); United States (Collins). 
O. capitata West fil., nov.sp. (Plate 4004). Trichomes free 
d and twisted, at others arcuate or even nearly straight, sub- 
eta: slightly attenuated towards the capitate apex. Articuli 
usually twice, but up to three times, as broad as long; dissepiments 
not granulated; protoplasm eg ape or sparingly ves aa 
convex 
Apical cell capitate, furnishe a more or less 
closely-appressed calyptra. Diameter of eres 9°6-11-°9 p 
length of articuli usually 4-6-5 (rarely 3-3-8°5) p; exit 
diameter of apical cell 6°9-9°1 »; nee of lees cell 6°7-8'1 p; 
diameter of constriction in a cell 3°6-8 p 
° 44’ N.; long. 45° 30’ W. 
JOURNAL OF AE: 87. (Aue. 1899.] Zz 
