Od a new Sporozoon from the vesiculse seminales of Perichaeta. 79l 



Gregarines and the Myxosporidia and has shown that there is at least 

 no Wide gulf between the two groups. 



I would suggest that the Sporozoun described in the present 

 paper still further bridges over the linc of Separation. 



The general structure of the parasite shows that it should be 

 placed among the Gregarines, while the cellular cyst, though not 

 perhaps exactly like that of any Myxosporidian , is yet more com- 

 parable to what is found in that group. 



As my account of this species is necessarily vcry incomplete, 

 I refrain from any further discussion of its systematic position among 

 the Sporozoa. 



R e s u m e. 



The following is a brief resum6 of the principal facts contained 

 in this paper. 



1) In the youngest stage the Gregarine has a spherical body 

 with one or two long processes; if there are two proccsses they are 

 placed at opposite poles. There is a delicate cuticle, and the ecto- 

 plasm and entoplasm can be distinguished. 



'2) In the next stage the parasite is mach larger but of the same 

 form. The granules of the entoplasm are for the raost part large and 

 oval in form, but there are also smaller granules interspersed among 

 them. The ectoplasm is especially thick in the processes of the body. 

 The cuticle is raised into fine ridges which run obliquely to the 

 long axis. 



a) In this stage and in the last multiplication by fission occurs. A 

 swelling appears at the extremity of one of the processes. This gra- 

 dually grows, develops at process at its free extremity, and becomes 

 separated as a new individual. 



3) In the third stage the Gregarine still retains the same form. 

 The cuticle of the free stage persists, but is covered by a cyst mem- 

 brane consisting of a fibrous substancc in which are imbedded numer- 

 ous nuclei. 



a) Sporulation commences by a rapid division of the at first 

 Single nucleus; karyokinetic figures are formed during the division of 

 the nuclei. The protoplasm also divides, but not so rapidly as the 

 nucleus. 



