90 Sketch of the Infusoria of the family Bacillaria. 
to redness, nor by action of hot hydrochloric acid. They fuse 
with effervescence with carbonate of potassa, and the fused mass 
when treated with hydrochloric acid gives silica in abundance. 
There can, then, be no doubt that the glass-like filaments of this 
species are siliceous. Our species agrees in all respects with au- 
thentic European specimens (in Herb. Tor.) collected by Hoff- 
man Bang, at Hofmansgave. 
2. Gaillonella aurichalcea. (Pt. 2, fg. 4,4 a?) Corpuscles ton 
gated, cylindrical, truncate, flattened smooth, contiguous, a simple or 
double pierced furrow in the middle of the body, oyaries greenish, -be- 
coming golden yellow when dry, z$z line. Conferva orichalcea, Ag., 
Syst. Alg. p. 86. Ne meat Kiz., Linn., 1833, p. 72, 588, 
Our species’ (PL 2, fig. 4,a, b,) agrees so closely with Kazing’s . 
figure 68, even in the branching character and occasional produe- 
tion of large globular joints, (see (c) in fig. 4,) that I feel little 
hesitation in considering it as the G. aurichalcea, although I am 
unable to perceive the “sillon percé” alluded to by Ehrenberg in 
his specific character. This species might easily be mistaken for 
a Conferva. It often forms bluish green masses, of full a foot in 
extent, and while fresh it is quite as flexible as any Conferva ; 
but on drying, it becomes of a light brassy yellow color, and is 
then excessively fragile. ‘There is much variation in the diame- 
ter of the filaments, and in the relative length of the joints. The 
filaments which have the smallest diameter, have, generally, the 
longest joints. They retain their forms when heated to white- 
ness, and when treated with strong nitric acid. This species oc- 
curs in springs, rivulets, &c., and appears as common in this 
country asin Europe. In (Pl. 2, fig. 4, b,) is represented a spe- 
cies of Gaillonella apparently distinct from figs. 4 and 4 a. It 
shows the pierced furrows and agrees in most respects with the 
figure of G. aurichalcea given ay Ehrenberg in his memoir en- 
titled Die Fossilen Infusorien und die lebendige Dammerde, Pl. 
1, fig. 23. It is possibly, only a state of our species above refer- 
red to. It occurs in ponds near West Point. 
“s ‘ 
while the rocks below low water mark ate covered with Balani and minute coral- 
a and the marine flora ie invepfescnin’ by vast qunesitice of avery wien 08th 
siD onia, nov. 6p %y abun. 
and an elegant Alga, 2 5 open essageemne i ‘with Delesseria Leprieurii of Montagne, 
which was first detected on the shores of Cayenne. (See Seager ae 
Naturelles, 2d series, 1 Bee 13, p- 196, and . 5.) 
