No. 639] 



AMERICAN FOLLICULINAS 



353 



Folliculina, and Ryder expressly mentions the long- 

 beaded nucleus in the form Freia producta, which is most 

 remote from Mueller's simple form; and, in the second 

 place, I find that the commoner Chesapeake Folliculina 

 has a moniliform nucleus and is by no means close to the 

 Folliculina of Mueller. 



Thus the moniliform nucleus is not restricted to ani- 

 mals in sacs of the Mueller type. Moreover, observa- 

 tion shows me that in the commoner Chesapeake Follicu- 

 lina the nucleus may pass from the moniliform shape to 

 more and more simple shapes, resembling the elliptical 

 nucleus of so many other species ; that is, just as was to 

 be expected from the findings of Johnson in Stentor, the 

 form of the nucleus is not constant, but a very long monili- 

 form nucleus may fuse into a short elliptical shape. The 

 same change was observed by Sahrlage. 



Whether the nucleus is condensed or nodulated can 

 then be but a poor basis for classification of the Folli- 

 culinas. 



Till recently no micronuclei have been described in 

 Folliculinas, though knowm in Stentor, and Carl Dons has 

 used this as basis for separating the Folliculinas from 

 the Stentor family; however, in two forms of Chesapeake 

 Folliculinas I find minute darkly staining bodies associ- 

 ated with the macronucleus which may well be micro- 

 nuclei, though their function has not been observed. 



The only other anatomical character available seems to 

 be the form of the anterior part of the body which is in 

 some Folliculinas a funnel, and in others a funnel with. 

 two sides, more produced so that they may even form 

 long arms likened by Eyder to obstetrical forceps, and 

 again, in another species, by Wright, to the long ears of 

 a hare. 



But here again I find that an animal may have in its 



excccdiiiu-ly loiii:' ;ii-ins. wliicli in i-<'1 ractt'd states during 

 adxci'sc conditions nin\- bf \ ('r\' -ivntlv" rr( hicod and mod- 

 itit'd in I'onn and propor! ions, and ihvvv are also transi- 



