774 



HAPLOSPORIDIA 



consist of an encapsuled multinucleate j)lasmodium in which occur ovoid 

 spores. They may be confused with Microsporidiida, a mistake which was 

 made by Thelohan (1895), who placed /. giganteiim in the genus Glugea. 

 The members of the genus Hajjlosjwridimn Caullery and Mesnil (1899) are 

 parasitic in marine annelids. They give rise to spherical cysts, in which the 

 Plasmodium breaks up into a number of uninucleate bodies, each of which 

 divides into four to form four ovoid spores. Each spore has one end 

 flattened. Granata (1914) described in detail the development of H. lim- 

 nodrili parasitic in the intestinal epithelium of Limnodrilus ndeJiemianus 



T^iG. .333. — Section of Intestine of Limnodrilus ndel-emiaims infected with 

 Haplosporidium limnodrili Granata, 1914 ( x 750). (After Granata, 1914.) 



y. Young form with single nucleus; p, older forms with two or more nuclei; s, form with four 

 nuclei (schizont); m, young forms resulting from division of schizont; g, forms which give 

 rise to spores, gametes, or zygotes; sp, spores. 



(Fig. 333). The genus Urosjwridium Caullery and Mesnil (1905) is closely 

 related to H aplosporidium. The spore is provided with a long caudal 

 process. The genus Coelosporidiuin Mesnil and Marchoux, 1897, was estab- 

 lished for certain parasites of the kidneys of Crustacea. Crawley (1905) 

 placed in this genus a parasite of the Malpighian tubes of the cockroach 

 which had been taken for a microsporidian [Nosema periplanetcB) by Lutz 

 and Splendore (1903). It occurs as amoeboid bodies and ovoid spores in 

 the cytoplasm of the cells. Another genus is Serumsporidium Pfeiffer, 

 1895, which includes parasites of the coelomic fluid of Crustacea. They 

 have been studied by Noller (19206) and Stempell (1921). Noller 



