INTRODTJCTION. 13 



unsuccessful line of advance from the typical Protozoan, 

 not reaching, however, the Metazoan type of structure. 

 He discussed the origin and relationship of the spore -forming 

 nuclei and cells in the pansporoblast, and suggested that 

 physiologically the spore of a Myxosporidian is a multicellular 

 unit analogous to the Infusoriform embryo of the Mesozoan 

 Dicyema, although the Myxospokidia exhibit Rhizopodan 

 relationships, while the Mbsozoa are probably derived from 

 ciHated ancestors. Although the Myxospokidia do not 

 represent a direct link between Protozoa and Mbtazoa, 

 they seem to indicate a physiological reason for the origin of 

 a soma, as a protective accessory to germ-cells. There is 

 a well-marked alternation of generations among the Ccelen- 

 TEEATA, as there is among the Myxospokidia, and the occur- 

 rence of nematocysts in the former and the polar-capsules in 

 the latter is not without significance. 



The Spokozoa are divided in this work into the following 

 subclasses, orders, and suborders : — 



I. Subclass Telosportdia Schaudinn. 



I. Order Gregaeinida A. Schneider em. Doflein. 



1. Suborder Etjgregarinaria Doflein. 



1. Legion Haplocyta Lankester. 



2. Legion Septata Lankester. 



2. Suborder Schizogregabinaria Leger. 

 II. Order Coccidia Leuckart. 



1. Suborder Adeleidea Leger. 



2. Suborder Eimeridea Leger. 



III. Order HLsimosporidia Danilewsky era. Doflein. 



1. Suborder H^mosporidhdea Wenyon, 



2. Suborder Piroplasmidea Wenyon. 



II. Subclass Cnidosporidia Doflein. 

 I. Order Myxosporidia Biitschli. 

 II. Order Actinomyxidia Stole. 



III. Order Microsporidia Balbiani. 



IV. Order Helicosporidia Kudo. 



III. Subclass Sarcosporidia Balbiani. 

 I. Order Sarcosporidia Babudieri. 



II. Order Globidia Babudieri. 



IV. Subclass Haplosporidia CauUery & Mesnil. 



The further classification into famihes and the genera and 

 species dealt with will be seen from the Systematic Index. 



Study of the Group in India. 



Vandyke Carter (1888), Evans (1888), Hehir (1893), and 

 Crombie (1894) were the earhest to observe the malarial 

 parasites in India. It was, however, Ronald Ross (1895, 1897) 

 who observed certain stages of development of the malarial 



