448 BIOLOGY OF THE PROTOZOA 



Sub-order 3. Platysporea, Kudo. 



Family 1. Myxidiidae, Thelohan. 

 Family 2. Myxosomatidae, Poche. 

 Family 3. Myxobolidse, Thelohan. 

 Order 2. Microsporidia, Balbiani. 



Sub-order 1. Monoenidea, Leger and Hesse (1922). 

 Family 1. Nosematidae, Labbe (1899). 

 Family 2. Coccosporidae, Leger et Hesse 



(1922) emend Kudo. 

 Family 3. Mrazekidse, Leger and Hesse (1922) 

 Sub-order 2. Dicnidea, Leger and Hesse (1922). 

 Family 1. Telomyxidse, Leger and Hesse 

 (1910). 

 Order 3. Actinomyxida, Stol?. 

 Sub-class 2. Sarcosporidia. 



Sub-class L CNIDOSPORIPIA, Doflein. 



The largest number of species and the best known forms of 

 Neosporidia are included in this division. Sporoblasts are bivalved 

 and contain one or more polar capsules which recall the stinging 

 cells of the Coelenterata. The threads of the capsules are probably 

 hollow and are spirally wound in the capsule from which they are 

 evaginated under proper conditions. Such threads, the function 

 of which is entirely problematical, may be short or very long, 

 reaching in some cases a length many times that of the sporoblast. 

 The germs can scarcely be called sporozoites since they are not 

 formed as a result of metagamic divisions following fertilization. 

 The term sporoplasm has been used to distinguish the vital, living 

 portion of the spore from the, other differentiated parts and will be 

 used here to designate the young germ up to the time of development 

 into the trophic individuals. The sjwres are all built on the same 

 general plan of structure (Fig. 187). 



The form assumed by the trophozoites varies with the habitat. 

 Many of the Cnidosporidia are lumen-dwelling and many are cell- 

 dwelling, or tissue parasites. The free forms are characterized by 

 relatively complex organization with ectoplasm, endoplasm and 

 pseudopodia similar to amcebse. The pseudopodia may be filiform, 

 lobose or lamellate and locomotion is frequently as active by amoeboid 

 movement as in many amoeba?. Tissue- or cell-dwelling forms are 

 active only in the young stages and according to Doflein may appear 

 in the following conditions: (1) Enclosed in cysts which are 

 formed for the most part by concentric layers of connective tissue 

 derived from the host, and an innermost layer formed hy the 

 organism. Huge cysts resulting from association of parasites, and 

 easily visible to the naked eye are formed in many cases. (2) 

 "Diffuse infiltration" a term used to indicate collections of parasites 



