HAPLOSPORIDIA 



multinucleate trophozoite becomes segmented into a number of ovoid or spherical 

 pansporoblasts, which give rise to few (one to four) spores. Such a spore, when set 

 free, begins the life cycle over again. 



More recently (1905-1907) two important organisms have been described and 

 included in this group, namely, Neurosporidium cephalodisci^ (Ridewood and 

 Fantham) from the nervous system of the prochordate, Cephalodiscus nigrescent, 

 and Rhinosporidiutn kinealyi (or seeberf) from the septum nasi of man. In the case 

 of Rhino sporidium and Neurosporidium, after the uninucleate spore has grown into 





FIG. no. Haplosporidiurn heterocirri. 

 Section throughout wall of the Polycha?te 

 worm, Heterocirrus viridis, showing various 

 developmental stages of the Haplosporidium. 

 x 55- (After Caullery and Mesnil.) 



FIG. ill. Haplosporidian spores. 

 a. b, Haplosporiditini heterocirri. a. 

 fresh ; b, after immersion in sea water ; 

 c, d, Urosporidhun ftiliginostim, 

 x 1000. (After Caullery and Mesnil.) 



a multinucleate trophozoite, the latter segments into uninucleate pansporoblasts, 

 as in the preceding cases. A difference then occurs, for each pansporoblast 

 -enlarges, its nucleus divides and a " spore-morula" is formed. Thus a multinucleate 

 pansporoblast or spore-morula, divided into many uninucleate sporoblasts (spore 

 mother cells) is produced, and each sporoblast without further change becomes 

 a uninucleate spore. 



The Haplosporidia have therefore been divided by Ridewood and Fantham (1907) 2 

 into two sections : 



(1) The Polysporulea, wherein the pansporoblast gives rise to a number of 

 spores (nine or more), e.g., Rhinosporidium, Neurosporidium. 



(2) The Oligosporulea, wherein the pansporoblasts give rise each to a few (four) 

 spores or to only a single spore, e.g., Haplosporidium, Bertramia, Ccelosporidium, 

 I chthyo sporidium. 



Rhlnosporidium kinealyi, Minchin and Fantham, 1905. 



Rhinosporidhnn kiuealyi, parasitic in man, must now be con- 

 sidered in greater detail. This organism was found in nasal polypus 

 in India, and has since been recorded from the ear as small nodules 

 in the external auditory meatus. The Indian cases came from the 



1 Quart. Jonrn. Microsc. Sci., li, p. 81. 



2 See Fantham, Brit. Assoc. Reports, 1907, p. 553. 



