PROTOCOCCACEE, 49 
Hydrianum heteromorphum. Reinsch contrib. p. 80. 
Cells at first globose-elliptical, attenuated below into a thin 
hyaline stem; contents granular, then contracted in prepara- 
tion for formation of the gonidia; zoogonidia elongated, escaping 
at the broadly opened apex. 
Sizz. Cells, unopened, :008-0095 mm. broad; opened 
cells ‘0066 x ‘02 mm. 
Reinsch Contributiones ad Algologiam (1874) p. 80, t. 11, 
fig. 3. 
Attached to filamentous alge. 
Plate XIX. fig. 6. a, cells in different stages attached to a filamentous 
alga magnified 400 diameters; b, young cells ; v, mature cells magnified 
800; d, cell with zoogonidia escaping, and magnified 1200 diameters ; e, 
zoogonidia further magnified. 
Genus 86. CODIOLUM. Braun. (1852.) 
Cells at first obovate, as they grow older becoming clavate, 
or nearly cylindrical, densely aggregated in tufts, base attenuated 
into a stem; cell-contents green, delicately granular, mixed 
with numerous starch granules. Propagation by zoogonidia, 
and also by resting spores (hypnospores),—Braun Unic. Alg. 
p. 19. 
Codiolum gregarium. Br. Alg. Unic. p. 20. 
Cells elongated, subclavate, green; many times longer than 
the diameter, apex rounded. 
Size. Cells 03 mm. diam. 
Rabh, Alg. iii. 90. 
On maritime rocks (Z. M. Holmes). Also in the drip of 
fresh water. 
Some persons contend that this is only a marine plant, others that it 
occurs also in the neighbourhood of the coast, but either in zstuaries 
or entirely removed from salt water. We include it here without preju- 
dice to either opinion. 
Plate XX. fig. 1, 2, 3, young plants; 4, 5, further developed plants ; 
6, mature plants X 300 diameters, one containing starch granules, the 
other mature zoogonidia ; 7, 8, zoogonidia. 
