MR. С. S. WEST ON SOME CRITICAL GREEN АТС Д. 281 
Dangeard !, Schmidle ?, and Borge” have all placed Glæochæete Wittrockiana in 
the Chlorophycer. It therefore seems probable that these authors really had 
a green Alga under observation, and not the blue-green Alga described by 
Lagerheim. 
Polyehetophora simplex and Glrochete Wittrockiana should not be confused. 
The former is а member of the Chlorophycez, and its cells, which are not 
enveloped in mucilage, are each furnished with two to four simple bristles. 
The latter is one of the Myxophycem, with its cells enveloped in a copious 
mucilage, and its bristles frequently possess short spur-like branches. 
2. BRACHIOMONAS SUBMARINA, Bohlin, (РІ. 20, figs. 7-19.) Tam indebted 
to Mr. Thomas Bolton, of Birmingham, for kindly bringing me, in the early 
part of February 1907, a tube containing а motile green Alga of great interest. 
It was collected in brackish marshes at Sheerness by the Rey. Eustace Tozen, 
who sends the information that it is common there in February. Mr. Bolton 
was also good enough to procure me a further supply of this Alga in April. 
The Alga is a member of the subfamily Chlamydomonadex of the 
Volvoeacem, and belongs to Brachiomonas, Bohlin, a genus which, so far as I 
am aware, has only been previously observed from the brackish marshes and 
harbours of Stockholm and certain of the coast districts of Norway. Two 
species were described by Вот * ten years ago, but do not appear to have 
been since recorded. 
The plant from Sheerness does not strictly agree with either of the species 
deseribed by Bohlin, but to a certain extent combines the characters of each 
of them. The anterior half of the cell is subhemispherical and the posterior 
half conical. The posterior extremity is provided with a stout attenuated 
horn, and four other equidistant horns are disposed in the equatorial plane. 
The equatorial horns are backwardly curved, but otherwise similar to the 
straight posterior born. 
The parietal chloroplast, which is somewhat massive, does not extend into 
the horn-like processes, except to form a rounded lobe at the base of 
each. А large pyrenoid is present”, usually towards the posterior region, 
and a number of bright granules are scattered through the ehloroplast. 
At least one vacuole is present in the cell, and there may be one near the 
base of each process. А solitary vacuole is usually large, and often of 
! Dangeard in * Le Dotaniste ' (1889), p. 158, t. 7. f. 12 а-у (described as а new Alga under 
the name of Schrammia barbata, Dang.). 
2 W. Schniidle, * Beitr. alp. Algenfl.” in Oesterr. botan. Zeitschr. xlv. (1895) p. 306, 
t. 14. f. 9. 
? О. Borge, “ Süsswasserale. Süd-Patagon." in Bih. К. Sv. Vet.- Akad. Handl. (1901) no. 10, 
p. 16. 
' К, Bohlin, * Zur Morphologie und Biologie einzelliger Algen," in Ofvers, К. Vet.-Akad. 
Fürh. (1897) no. 9, pp. 508-510. 
” Sometimes more than one pyrenoid is present (vide fig. 11). 
