4 ANNIE PORTER 



any évidence in favour of the flagellar view ; and the statement 

 that S. anodontae has pointed ends that are non-vibratile 

 remains absolutely unrefuted. The pointed ends probably 

 aceentuate the force with which the organism moves through 

 the viscid substance of the style, and also acts in the same 

 way as the pointed end of a gimlet, by gradually decreasing 

 the résistance offered to the organism as it spirally bores its 

 way forwards or downwards through the style. The same is 

 true of some of the parasites of Tapes and of Mytilus, whose 

 movements hâve been under careful observation. Thèse pos- 

 sess pointed ends. 



The pointed terminal portions of ail the forms of Spirochaetes 

 mentioned seem to consist of ectoplasm with but the faintest 

 trace of endoplasm, though the refraction of a few granules, 

 probably chromatin, was seen by using the ultra-microscopic 

 condenser. That the internai granules of Spirochaetes are 

 chromatoid in nature has been previously demonstrated by 

 meansof transverse sections of the parasite (Fantham, I. 1908, 

 Text-fig. 6). 



One noticeable feature of thèse organisms was the présence 

 of at least one strongly marked myoneme on the body (fig. 1, 

 b. my). Wave-like movements were observed in it of a nature 

 resembling those of the myonemes of the membrane. I prefer 

 to deal with both sets of myonemes together. 



The nuclear apparatus of the Spirochaetes was also observed 

 in life. Bright, refrac tile bands appeared transversely across 

 the body at intervais (fig. 1, w). Thèse stained more deeply with 

 méthylène blue used intra vitam, and were evidently of chro- 

 matic nature, therein confirming the détails of structure so 

 well described by Fantham for thèse parasites. In favourable 

 spécimens I was able to demonstrate refractile dots (probably 

 chromatin) to fellow research-workers. The water-immersion 

 lens was foundtobe of much service in this portion of the inves- 

 tigation. The dots were seen in dividing spécimens in hfe (fig. 1), 

 and I would désire to emphasize this statement. A few speci- 



