790 t'RANK E. BEDDARD, 



During life the entoplasm is probably in motion and flows along 

 the Prolongation of the body ; the large granules of the entoplasm are 

 carried along with it. One of the extremities of the body 

 becomes enlarged by a kind of budding and in this 

 bud collects a quantity of entoplasm granules [I can say 

 nothing as to the behaviour of the nucleus]. The bud gradually 

 increases in size until it becomes as large as the pa- 

 rent form. It is then separated off by a constriction 

 in the process connecting it with the parent having 

 previously (in some cases) developed a correspon ding 

 process at the opposite pole of the body. 



5) Affini ties. 



These then are the principal facts in the structure of the Sporo- 

 zoon. It remains uow to be considered whether it is a true Gregarine 

 or a Myxosporidian. 



As has been already stated the cellular cyst is so far evidence 

 in favour of referring this Sporozoon to the Myxosporidia. Indeed 

 there appears to be no Gregarine in which there is a cyst of this 

 kind. In the Myxosporidia the parasite surrounds itself with no clear 

 structureles cyst like that of Gregarines, and usually it breakes up 

 into sporcs in an unencysted condition, that is to say without being 

 surrounded by the cellular cyst which is found in certain forms. Ac- 

 cordingly in tlie Myxosporidia the mature individual is oftcn of an 

 irregulär form. This appears to be at first sight a further point of 

 resemblance betwcen the Sporozoon described in the present paper 

 and the Myxosporidia; I have figured numerous cysts (fig. 1) of this 

 parasite which are very different in form. 



The form however does not vary within wide limits and corre- 

 sponds in cvery case to that of the free individuals ; it is, as I am dis- 

 posed to think, the characteristic form of the species and is not due 

 to the fact that the individuals can perform active amocboid move- 

 ments while within the cellular cyst: the presence of a structureless 

 delicate cyst membrane surrounding the parasite as it lies within the 

 cellular cyst, is however decidedly against the probability of its being 

 a Myxosporidian. 



The young stages represented in fig. 8 furnish a very strong 

 argument in favour of regarding this organism as a Gregarine. They 

 have a fixed and definite form like that of most Gregarines. BtJTSCHLi 

 bas summed up (p. 2) the resemblances and differences between the 



