10 



ANNIE PORTER 



but is a variant, possibly of use in effecting an entire change of 

 direction. 



Another spécimen of *S'. anodontae while within the crystal- 

 line style performed similar movements to the one descri- 

 bed immediately before, but for nine minutes one part of the 

 parasite was twisted spirally about the other part (figs. 8-12). 

 On the average, eaeh end of the parasite moved up and down 

 four times per minute. At the end of nine minutes, the ends 



FiciS. 8-12. Eutangleinent foniis, whlch according to some workers hâve been mistakon for longi- 

 tudinal division. No such mistake should lie iiinde. 



freed themselves, and the organism began movements of the 

 « barometer tube » variety, and continued them for five minu- 

 tes, when the parasite straightened itself rapidly and swam 

 away. The membrane of the parasite was very distinct during 

 the last phase. According to some authors, it is entanglement 

 phenomena such as those described above, that hâve been 

 mistaken for longitudinal division ! The absurdity of such a 

 statement is patent to any one who has carefully studied the 

 movements of living Spirochaetes of Molluscs. 



As illustrative of the wonderful and comphcated figures 

 described by thèse Spirochaetes, I append a séries of figures 

 from my sketches of the forms assumed by one parasite, 

 within a freshly removed style, during a period of twenty-one 

 minutes (figs. 13 to 24). 



