182 AQUATIC PHYCOMYCETES 



C button consisted of a thick-walled citriform structure, which he con- 

 jectured was probably formed after the parasite quit the dead host, 

 moved amoeboidly away, and encysted. 



? CHYTRIDHAEMA Moniez 



C. R. Acad. Sci. Paris, 104: 183. 1887 



? Chytridhaema cladocerarum Moniez 



Loc. cir. 



Sporangium inoperculate, a flattened sac without cross walls or a 

 discharge tube, formed within the body cavity of the host; zoospores 

 top-shaped, 3 u long, with dense contents, bearing a refractive pro- 

 tuberance on the broad base, the opposite extremity prolonged into 

 a flagellum, many formed in a sporangium. 



Parasitic in Crustacea, Sinocephalus retulus, Acroperus leucocephalus, 

 France. 



Little of taxonomic significance can be obtained from the descrip- 

 tion. The sporangia are said to fill the body cavity of the animal, 

 whereas the zoospores were found in abundance in the blood. It is 

 not definitely stated whether the flagellum is anterior or posterior. 

 Moniez thought the organism resembled olpidiaceous and lagenidia- 

 ceous fungi. He considered that the protuberance on the zoospore was 

 a sort of anthcridium and that the sporangia were formed by the 

 whole mycelium of a chytrid. 



ACHLYOGETONACEAE 



Thallus endobiotic, holocarpic, becoming transversely septate at 

 maturity and forming from two to several linearly arranged inoperculate 

 sporangia; zoospores posteriorly uniflagellate; resting stage not known 

 with certainty. 



Occurring primarily in fresh-water algae. 



The family differs from the Olpidiaceae in forming in linear series 

 from the thallus two or more sporangia. Resting structures have not 

 as yet been adequately demonstrated, although they have been re- 

 ported as occurring in Achlyogeton (Martin, 1927) and Bicricium. 



