THI/IUI': Neufomotor Apparatus in Euplotes !!"> 



only OIK- cud to the membranelle tilicr. Explorations with Ilic needle 

 show this connection to be fairly secure. Also, the relation of each 

 niembranelle tn its corresponding membranelle liber plate has been 

 found to he the same as the relation of tin- anal cirrus to its anal fiber 

 plate. Of this one may he fully convinced upon observing the nicin- 

 branelle peel from it.s plate, a process which occurs not infrequently 

 about one minute after the disruption of the ectoplasm. Thereupon, 

 the basal plate of the membraiielle, in which the basal corpuscles of 

 the component cilia and the ciliary rootlets are imbedded, eompletely 

 sepai-ales from the membranelle fiber plate which, like the anal cirrus 

 plate, shows a smooth, clean surface, with no evidence of any ciliary 

 rootlets having been attached. 



The "dissociated libers" described by Yocom (1IMS) as radiating 

 at the base of each of the thirteen cirri (i.e.. excluding the anal cirri). 

 have been found to be definitely connected with a plate somewhat 

 similar to the anal cirri plate, although of a shape (fig. 21) correspond- 

 ing to that of the base of the cirrus. These were first observed upon 

 the disintegration of an animal likewise .stained with a .0001 per cent 

 auctions solution of hacmatoxylin. Several radiating fibers were dis- 

 tinctly seen to be united to each plate. As yet. T have not definitely 

 observed the separation of one of these plates from its cirrus. Indica- 

 tions in two cases where the separation was almost complete point 

 toward a relation between cirrus and plate here that is similar to the 

 relation of an anal fiber plate to its corresponding cirrus. I shall 

 designate these plates the "dissociated fibers plates." Kiiru res 21 and 

 ~2}/i show several such plates from the same organism which vary 

 slightly in sixe and shape. These variations are apparently common. 



TRANSECTIONS 



Hitirii n /In "i/rmij) itf tltr/i" and "i/rnup of ftiitr" frtnilnl rirri 

 i lig. 2). The anterior part of the animal swims rapidly (of. swim- 

 ming movement :i. p. 42!)). the inner side, that with the three frontal 

 cirri, performing a small circle and the opposite side a correspondingly 

 larger one. This performance continues the same after more water is 

 added to the hanging drop. The part infrequently revolves, as on the 

 IOULT axis of the normal animal, and it occasionally reverses the effect ivo 

 stroke of the membranelle.s to drive itself a short distance backwards 

 (cf. swimming movement 6, p. 429). In either case the circus move- 

 ment to the right is soon resumed and continues with few such inter- 

 ruptions until the part apparently becomes fatigued and dies. Death 



