488 PROCEEDINGS OF SECTION D. 
(P. leuckartii), both in the fresh condition and when treated by 
the gold method, with the result that the fibres of the jaw muscles 
are entirely unstriated, like the muscles of the rest of the body, 
though a peculiar transversely-striped appearance is imparted to 
those muscles by the arrangement of a number of the finest 
branches of the trachee. 
If the statement made by Hatchett-Jackson should prove to be 
correct—that in P. capensis the jaw muscles alone are striated— 
then one would be tempted to think that we have in the muscular 
fibres of the appendages of Peripatus an example of degenerate 
compound fibres, in which the striation has become lost, save in 
one set of muscles, since the ordinary fibres of the muscles of the 
limbs are of compound character, and resemble some varieties of 
muscular fibres found in other Arthropods in all respects save in 
the absence of striations. This does not, however, in view of 
what we know of the rest of the organisation of Pertpatus, seem 
very probable, and it appears more likely that a mis-statement 
has crept into a work otherwise remarkable for its accuracy. 
6.—DESCRIPTIONS OF NEW VICTORIAN ALGA. 
Translated by J. BracesripcE Witson, M.A., F.LS8., from 
Till Algernes Systematik nya bidrag af J. G. AGARDH. 
SIPHONE. 
Bryopsts claveformis.—Group of plants somewhat pyramidally 
tufted. Fronds bristle-shaped, about half an inch in height, 
radiating upwards from a radical plexus, simple or sparingly 
dichotomous below, cylindrical, gradually thickening upwards 
into a club shape, bearing spherical conceptacles below the blunt 
apex. 
B. baculifera.—Group of plants somewhat pyramidally tufted. 
Fronds bristle-shaped, four to five inches long, radiating upwards 
from a radical plexus; dichotomous below, branches distant, 
narrowed at the base, finally cylindrical, apices blunt. 
B. gemellipara.—F¥ronds more or less erect, generally simple ; 
each plumula at the lower part of its contour lanceolate, 
apparently distichous. The branchlets springing on each side 
duplicated in two ranks, each forming several series of twin 
branchlets, above the middle simple, with a very short imbricated 
featherlike tip. 
Avrainvillea obscura.—Frond rising with a short flattened 
stem from a swollen base. Upper portion passing into a wide 
wedge-shaped expansion, thick, dark in colour, ragged along the 
terminal margin. (Note.—It is not unlikely that, when more 
perfect specimens are obtained, our Victorian plant will prove to 
be Avrainvillea letevirens of Crouan.—J. B. W.) 
