Freshwater Algae and Schizophycese. By A. W. Bennett. 11 
70-80 /u, ; breadth about 75 g,; sides 42 [x ; very nearly straight or 
slightly convex, with rounded base ; ends 42 fx, quite straight ; sinus 
moderately deep, triangular ; membrane rough with pearly granules, 
which are wanting at the two extremities ; two conspicuous pyrenoids 
in each semi-cell. Though not agreeing absolutely in measurements, 
I cannot doubt that this is Nagel i’s Euastrum Ungerianum (Gratt. 
einz. Alg., p. 120, t. vii. a f. 10), from Switzerland, which has also 
been found by Lundell in Sweden, it resembles C. hotrytis, except 
in its somewhat smaller size, and in the ends being quite smooth ; 
the outline is almost exactly that of C. homalodermum Nordst. It 
was seen several times in bog-pools, Hindhead. 
* Cosmarium undulatum Cord. 
„ conspersum Rifs. 
* „ sportella Breb. 
„ Broomei Thw. 
„ prsegrande Lund. 
Cosmarium Westianum sp. n. (Fig. 14.) 
Medium size. Semi-cells subreniform. Length of frond about 
52 //.; breadth about 50 /x; sides 17*5 fi, somewhat converging 
towards the apex, with about four deep crenations ; apex about 25 /x 
long, slightly convex, with five shallow crenations ; at the corners, 
between the sides and the apex, is a bifid projection ; sinus rather 
wide. Membrane quite smooth, but with conspicuous punctations 
arranged in regular series, wanting in the isthmus. One conspicuous 
pyrenoid in each semi-cell. This very pretty Cosmarium, which was 
met with several times in gatherings from Hindhead, and maintains 
its outline with great constancy, I have the honour of naming after 
Mr. W. West, who has done so much in the elucidation of British 
desmids. Its nearest ally appears to be C. Seely anum Wolle. 
Cosmarium moniliforme Rifs. 
This species is remarkably constant in the character from which 
it derives its name, two or more individuals remaining attached after 
fission is complete. They continue to be enveloped in an obvious 
gelatinous investment. 
Cosmarium globosum Buln. 
*Calocylindrus oblongus Benn. 
„ cucurbita DBy. 
„ Thwaitesii Rifs. 
„ connatus Kirchn. (Fig. 15.) 
Though the shape differs considerably from that drawn by Cooke, 
I take this to be the same species. The form in the Hindhead 
approaches much more nearly that described and drawn by Wolle 
(I)esm. U.S., t. xii. f. 9). Length about 120 yu; breadth 100 fx. 
