FAMILY: NOSEMATIDtE 



745 



The spore, which measures 16 to 18 microns in length and 1-3 to 1-4 in 

 breadth, has the end opposite that from which the filament is extruded 

 drawn out into a pointed process as long as the spore itself. The pan- 

 sporoblast gives rise to one spore (Fig. 317, i). 



M. brevicauda Leger and Hesse, 1916. — This form occurs in the fat 

 body of larvae of Chironomus flumosus. The spore, which measures 

 20 to 30 microns by 1-4 to 1-5 microns, has a short pointed process. 

 The jjansporoblast gives rise to one spore (Fig. 317, 2). 



M. striata Leger and Hesse, 1916. — This form occurs in the lympho- 

 cytes of the aquatic worm, Lumhriculus variegatus. The spores, which 



Fig. 317.- 



4 



-Spores of Microsporidiida of G-enus Mrazelia ( x 1,750). (After 

 Leger and Hesse, 1916.) 



1. j\I. caudata. 2. M. brevicaudata. 3. M. stricta. 



4. M. argoisi. 5. M. argoisi : manubrium extruded. 



6. M. argoisi : complete extrusion of manubrium and polar filament. 



measure 13 to 14 microns by 1-8 to 2-0 microns, have no process. Each 

 pansporoblast gives rise to one spore (Fig. 317, 3). 



M. argoisi Leger and Hesse, 1916. — This is a parasite of the fat body 

 of the fresh-water crustacean, Asellus aquaticus. The spores, which have 

 no pointed process, measure 17 to 23 microns by 3-5 microns. Each 

 pansporoblast forms a single spore (Fig. 317, 4-6). 



M. bacilliformis Leger and Hesse, 1922.— This species is a parasite 

 of the fat body of larvae of OrtJiodadius sp. The spores measure 5 by 0-8 

 microns, and each pansporoblast gives rise to eight spores. 



M. tetraspora Leger and Hesse, 1922. — This form occurs in the fat 

 body of larvae of Tanypus sp. The spores are 6-5 to 8 microns in length 



