PROTOCOCCACE.E. 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. 



SIZE. Cells, unopened, -008-'0095 mtn. broad ; opened 

 cells -0066 X '02 mm. 



Eeinsch Contributiones ad Algologiam (1874) p. 80, t. 11, 

 fig. 3. 



Attached to filamentous alga?. 



Plate XIX. Jig. 6. a, cells in different stages attached to a filamentous 

 alga magnified 400 diameters ; b, young cells ; c, mature cells magnified 

 800; d, cell with zoogonidia escaping, and magnified 1200 diameters ; e, 

 zoogonidia further magnified. 



GENUS 36. 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 (E. 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 aestuariea 

 or entirely removed from saltwater. We include it here without preju- 

 dice to either opinion. 



Plate XX. jig. 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. 



