348 



SPOBOZOA. 



be encapsuled in a membrane derived from the host ; in others 

 the membrane may be wanting. 



Perez (1905) subdivided the Microsporidia into two sub- 

 orders, ScHizoGENEA (or Oligosporea) and Blastogenea (or 

 Polysporea). In the former the principal trophic phase is 

 a uninucleate meront which multiplies by fission, and finally 

 gives rise to a sporont ; and in the latter there is a multi- 

 nucleate Plasmodium producing sporonts by internal cleavage. 

 As the exact structure of the trophic phase in many forms 



Fig. 172. — Effects of Microsporidian infection upon certain hosts. 

 A, central nervous system of Lophius piscatorius infected 

 by Nosema lophii (Doflein) ; B, fish showing a heavy 

 infection by Glugea hertwigi Weissenberg ; C, a Culicine 

 larva infected by Thelohania opacita Kudo, X 8 ; D, a 

 Simulium larva infected by Thelohania multispora (Strick- 

 land), X 6 ; E, F, normal and hypertrophied nuclei of 

 the adipose tissue of larvse of Culex pipiens, the latter as 

 afiectedhy Stempellia magna Jixido, X 750. (After Kudo.) 



is not known with certainty, the Microsporidia are now 

 generally divided, following Leger and Hesse (1922), into 

 two suborders, as follows :— 



1 . Spore with a single polar filament . 



2. Spore with two polar filaments ' . 



MonocnideaLeger&Hesse,p. 348. 

 Dicnidea Leger & Hesse, p. 360. 



I. Suborder MONOCNIDEA Leger & Hesse, 

 1922. 



Microsporidia in which the spore is provided with one 

 polar filament typically coiled in a polar capsule. 



Identification Table of Families. 



Spore oval, ovoid or pyriform ; if sub- 

 cylindrical, length less than four times [p. 349. 



the breadth NosematidSB Labbe, 



Spore spherical or subspherieal Coccosporidse * Kudo. 



Spore tubular or cylindrical, length greater [Hesse, 



than five times the breadth Mrazekiidse* L^ger & 



