Miscellaneous. 2ae 
larly elliptical or globose, rarely are they cylindrical. They are 
mostly of an orange-brown colour; and there exists a particular 
gelatinous coating to each cell rather than a common gelatinous 
sheath to the filament. These larger threads are apparently pro- 
duced from the smaller filaments by a process of growth. 
Near the base and in the under portions of the fronds, these fila- 
ments are scattered in the homogeneous jelly, in which they run in- 
finitely diverse courses. In the upper portions of the frond, and at 
some little distance from the base, the adjoining cells are very close 
to one another, and pursue more or less parallel courses, with enough 
firm jelly between to unite them into a sort of membrane. 
This plant certainly belongs to the Nostochacez, and seems a sort 
of connecting link between the genera Hormosiphon of Kiitzing and 
Nostoe. 
The best algologists now refuse to recognize the former group as 
generically distinct; and the characters presented by this plant seem 
to corroborate that view. 
The species appears to be an undescribed one; and I would pro- 
pose for it the specific name Caladariwn, which is suggested by its 
place of growth. There are several species of allied genera, which 
grow in the hot springs of Europe; but no true Nostoc has, I believe, 
been found before in thermal waters. The following is the technical 
description of the species ;— 
NV. caladarium, sp. nov. 
N. thallo maximo, indefinite expanso, aut membranaceo-coriaceo vel 
membranaceo-gelatinoso vel membranaceo, aut late viridi vel 
sordide olivaceo-viridi vel olivaceo-brunneo, irregulariter pro- 
funde laciniato-sinuato, ultimo eleganter laciniato ; trichomatibus 
inzqualibus, interdum flexuoso-curvatis, plerumque subrectis et 
arete conjunctis, in formis duabus occurrentibus: forma altera 
parva, viridis, articulis cylindricis, cum cellulis perdurantibus hic 
illic interjectis, vaginis interdum obsoletis, seepius diffluentibus, 
instructa; forma altera maxima, articulis globosis vel oblongis, 
aurantiaco-brunneis, cellulis perdurantibus ab ceteris haud di- 
versis. 
Hobs Cellule cylindricee maxime >;4,5 une. ; cellule perdurantis 
soon Une. 
4 Forme prime articuli maximi ,)4,,5 une. ; sells pee 
aaa Be Forme secunde articuli poblongt longi soo soos Une., 
lati so5a—eap> articuli globosi ~155-q7)yp une. 
Adherent to, and often more or less imbedded in, the fronds of the 
Nostoc, were scattered frustules of several species of diatoms, none 
of which was I able to identify. In some of the fronds there were 
numerous unicellular Alge, all of them representatives of a single 
species belonging to the genus Chroococcus, Niigeli. This genus con- 
tains the very lowest known organisms—simple cells without nuclei, 
multiplying, as far as known, only by cell-division. These cells are 
found single or associated in small families ; and in certain species 
these families are united to form a sort of indeterminate gelatinous 
