Mr. H. J. Carter on the Organization of Infusoria. 227 



granules, or vice versd, — the two developments tlius appearing 

 distinct : and this seems to be confirmed by what takes place in 

 a larger variety of this species of Euyhjpha, where there is a test 

 something like that of the parent developed in the interior, and 

 within this a spherical capsule, provided with a straight tube, 

 which extends to the pointed end of the test in which it is 

 immediately enclosed (tig. 32). At this time the animal has 

 entirely disappeared, and the contents of the spherical capsule, 

 having undergone segmentation, assume the form of circular 

 masses of granules, like those developed from the nucleus in 

 E. alveolata ; after which the granules separate, and pass out of 

 the straight tube, which is slightly patulous at its free extremity 

 (fig. 33). Other tests of the same variety may be seen more or 

 less filled with ovules, as before described. 



Lastly, in Spongilla, there are always many cells to be found 

 in that part of the mass where the seed-like bodies are being de- 

 veloped, partly filled with similar granules, loose or in' a circum- 

 scribed group ; but I have not yet been able to determine 

 whether this development is nucleolar, or ovular at an early 

 stage. It is certainly most like the granular development of the 

 nucleus in Eughjpha and Amoeba. 



In Astasia, irregular globular botryoidal masses, dividing up 

 into spherical cells, colourless and translucent, or of a faint, 

 opake, yellow tint, present themselves so frequently (and gene- 

 rally inversely developed with the ovules, as in the Rhizopoda), 

 that I cannot help thinking that they are also developnu^nts 

 from the nucleus (figs. 47, 48) ; but from not having seen them 

 present that evident granular aspect which characterizes this de- 

 velopment in the Rhizopoda, I have not been able to determine 

 satisfactorily whether they are parts of the latter, or that kind of 

 division of the sarcodc into green spherical cells which some- 

 times takes place in Euglena. 



In Euglena, also, I have described a development of the nu- 

 cleus, partly under the idea that it might be a parasitic rhizo- 

 podous development ; but nnw it appears to me to be a simple 

 enlargement, granulation and segmental development of this 

 body into polymorphic, rej)tant, mucous cells, filled with sper- 

 matozoid granules, as in the Rhizopoda*. 



Finally; from what organs, in the freshwater Rhizopoda, 

 Astasia and Euglena, are the ovules and the spermatozoid 

 granules developed ? 



Of the origin of the latter from the nucleus there appears to 

 me to be no doubt ; for independently of the changes taking 

 place in it which have been mentioned, I have never been able 



* Aun. & Mag. Nat. Hisit. vol. xvii. p. 115. 185(j. 



15+ 



