48 COCCOPHYCEE. 
Characium Sieboldi. Br. Alg. Unic. 82 t. 8, f. A. 1-21, 
Cells erect, equal, at the beginning nearly lanceolate, when 
older pyriform or obovate, 2-3-4 times longer than broad, apex 
obtuse or broadly rounded; stem short, hyaline, base attenu- 
ated, truncate, not discoid; contents bright green or yellowish- 
green, granular, in the beginning with a single amylaceous 
granule, afterwards with several. 
Sizz. Cells :022-:026 mm, diam. 
Rabh. Alg. iii. 83. 
In clear water, attached to filiform alge. Bangor (W. 
Joshua). 
“The gonidia of this species exhibit, after they have already attached 
themselves by their ciliated extremities, a tremulous motion lasting for 
almost a quarter of an hour, and evidently commencing in the delicate 
stalk.”—Braun p. 230. 
Plate XX. fig. 9. Cells in various stages, in situ, X 400; 10, cells 
containing mature zoogonidia; 11, free zoogonidia. 
Characium ornithocephalum. Br. Alg. Unic. p. 42, t. 3 C. 
Cells from the beginning unequal, incurved, distinctly stipi- 
tate, afterwards one side swollen, semilunate, apex produced 
into a straight or inclined beak; stem elongated, slender, base 
sometimes discoid ; cell-contents bright green, granular, with a 
central or lateral starch granule. 
Size. Cells -025--033 mm. long, without stem, half as wide, 
or more. 
Micr. Journ., 1867, p. 85. Rabh. Alg. iii. 86. 
In pools. 
Plate XIX. fig. 5. a, young cells; d, cell further advanced; 3, ¢, f, 
mature cells in different stages of division; e, mature cells with en- 
dochrome artificially contracted, all magnified 600 diameters. 
Characium tenue. Herm.in Rabh. Beitr. p. 26. 
Cells erect, narrowly lanceolate, six times as long as broad, 
attenuated towards each extremity, somewhat rostrate, and 
hyaline above; stem short, slender, not dilated at the base ; 
contents homogenous, bright green. 
Size. Cells 003-006 mm. diam. 
Micr. Journ., 1866, p. 126, 193. 
Characium ambiguum, var. c., Rabb. Alg. iii. 87. 
Attached to filamentous alge. 
Plate XIX. fig. 4. Cells magnified 400 diameters. 
Genus 35. HYDRIANUM. Rabh. (1864.) 
Cells as in Characium, but cell-contents at the beginning 
homogenous, afterwards contracted into a dark green ovoid 
corpuscle, from which, by oblique division, 2-4-8 biciliate zoo- 
gonidia are produced, which escape by a terminal aperture— 
Rabh, Alg. Eur, iii. 87. 
