ra 
92 Sketch of the Infusoria of the family Bacillaria. 
Virginia, p. 39. Ehrenberg gives the following description of 
Gaillonella suleata, a fossil species occurring in the schist. of 
Oran; from this description I suspect it to be closely allied to our 
species, and therefore wa its specific characters for the arenes 
of comparison. 
* Gaillonella sulcata. Corpuscles cylindrical, short, truncate at the 
two ends and flattened, furrowed across and in form of cells” (eilicpnte 
en travers et sous forme de cellules,) g/g to 7 line.*. 
6. Gaillonella? (Pl. 2, fig. 8.) Lospumeies sm crdllesliie 
cal, with two lines of | sasions latin’ adhering by alternate ili so as to 
form long zigzag chains, and occasionally auricle cled. fait tape acest 
The curious ase repneie ten ee PL. 2, fig. 8, appear t to partal 
of the characters of both Gaillonella and Bacillaria, showi 
the cylindrical corpuscles | of the. prions united by alternate & an- 
gles, as in many species of the latter. It is, perhaps, related to 
Diaioma auritum of Lyngbye, which is deaceiiea as having the 
“joints quadrangular, rounded, with an auricle at each angle,” 
and of which Greville remarks that the auricular appendages of | 
the angles give to the frustules the appearance of ‘ microscopic 
woolpacks.” Having seen no figure or specimen of D. auritum, 
I cannot decide as to its identity with our species; I believe, how- 
ever, that ours must be different, both from its abundance and 
from the remark of Kutzing (Linnea, 1833, p. 585) that D. au- 
rilum probably belongs to the Desmidiacez. 
Our species consists of large cylindrical siliceous joints, Pe 
adhering together by alternate angles in a zigzag’ manner. Most 
of the Liastiles show two lines of constriction, as shown in the 
figure. The connection of the frustules is by a very conspicuons, 
: flexible hinge-like ligament, which often gives to the joints an au- 
ricled appearance, which makes the comparison of them to “ mi- 
croscopic woolpacks,” or rather bales of cotton, not inappropriate: 
The joints usually contain a yellow or ochirentciik substance, 
arranged in a stellate manner, and not unfrequently this appears 
to be composed of minute globules, (ova?) as shown in the f 
ure. This species occurs, in vast quantities, in the Hudson River, 
at West Point. It pay be found in some places at low tide, giv- 
$$ 
* In Pritchard’ raat of Infusoria,. Recent and Fossil, I finda hag of Gill 
nella suleata, whic! es no doubt that our imens fro 
pete ts te n Delong to this species "The living an 
ard’s work, bran dtd at Gusbrn by ne Ses npeea s rite! 
PACKER AME ok) BOE Ro Meee | lg age Ee Bas 
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