3 
Ponds in Minnesota, G. pseudoprotuberans, Kir., has something 
in common with this form, but the semi-cells are separated by the 
narrow linear sinuses between them; C. inflatum has an obtuse-angled 
sinus. 
C, {Euastnim) Sendtneranium, Reinsch. (Figs. 30-31). — I have 
received a number of good specimens from Minnesota identical with 
Reinsch's figures and description. In outline it approaches C tiasu- 
turn {v. D. of the U. S., p. 89), but that is a strongly granulated 
species. 
C, Braunii, forma major, Reinsch. (Figs. 28-29). — Stillwater, 
Minnesota. 
C. Iceve, Rab. (Figs. 35 and 36). — I have described this species in 
Des. U. S., p. 62. Membrane finely granular, which is sometimes 
the character; v. Nord. et. Wittr. Ital. et Tyr. Coll., p. 29. The 
figures represent a smooth form, in accord with the name and des- 
cription by Rab. glabnim etlmvissimum. I received large numbers the 
past summer from the basin of a fountain in Pottsville, Penn. 
Xanthidium fasciciilatiwi (Ehrb.) Ralfs., van subalpinum, n, var. 
Prof. Delponte, in his Sp. Desmidiacearum Subalpinarum, p. i68, 
plate [3, describes this species differently from that described in 
Des. U. S., the variation being mainly in the wider separation of the 
lateral spines. To distinguish the two I make the above variety. 
Not rare in ponds of Minnesota or New Jersey* 
X. CoLUMBiANUM, ti. Sp, — Cclls about one-third longer than wide, 
divided by a deep constriction, which forms much ampliated acute- 
angled sinuses; semi-cells oblong-hexagonal, superior and lateral 
angles each produced into a firm aculeus; within the margin, four, 
often indistinct aculei; end view more or less regular hexagonal, each 
fi^gle somewhat produced and surmounted by a firm aculeus; with- 
in the margin are four aculei, the ends of which often extend over 
the margin; cytioderm smooth. Diameter 60/^; length 8ojw without 
aculei. 
Ocean Co., New Jersey. 
X. ToRREVT, n, sp. — Small, of nearly equal length and breadth, 
semi-cell somewhat hexagonal, half as long as wide; superior and 
lateral angles slightly protruding and surmounted each by a firm, 
straight, or slightly bent aculeus; end elliptic with one aculeus on, 
and another within, the margin of each end; on each side, a rounded 
prominence peculiar to the genus. Lateral view elliptic, with a con- 
striction in the middle; two aculei at each end and two short tips 
evident near the middle. The inflations or rounded prominences 
are seen near the juncture of the semi-cells. Diameter ^^fi without 
aculei, and, with them, 65;/; length about 75/i. 
Ocean Co., N. J., particularly Horicon Lake. On the green, 
sloping banks of this beautiful sheet of water is the home of the ven- 
erable brother of the late John Torrey of botanical fame, and in 
happy remembrance of whom this new plant is named. 
Auasttum crassum (Breb) Kg., var. scrobiculatum, Lund. — Diame- 
ter7o-75;Y; length 125-150//, 
Malaga and other places, New Jersey. 
E. MAGNiFicuM, //. ^/.— The largest of our Euastra\ about 
