76 SPIROCILETES. 



gram (Fig. 59). It is noteworthy that the nuclei (?) 

 are distinct from the axial filament, whereas in Sp. 

 balbianii the central staining rod is regarded as nuclear. 



Very remarkable is the conflict of opinion between 

 such observers as Butschli and Schaudinn as to the 

 possession of an undulating membrane by so large an 

 organism as this. Its creeping and feeling movements 

 are also noteworthy, as being unlike those seen in other 

 spirochaetes. The movements of swelling and thinning 

 may be compared with the "euglenoid" movement 

 seen by Plaut in Sp. vincenti. 



It has been pointed out to me by Mr. T. P. Collings, 

 to whom I am indebted for the preparation of the 

 illustrations in this little work, and whose experience 

 in drawing from the microscope is very extensive, that 

 the series of dots seen in the illustrations of Sp. plicatilis 

 is very suggestive of the existence of a spiral rod or 

 filament seen in optical section in the tissues of the ' ' cork- 

 screw". Fig. 59, d, shows such a rod corresponding 

 with the position of the dots in the diagram above it. 

 The vast experience, however, of the authors who have 

 described Sp. plicatilis makes it unlikely that they 

 would have failed to recognise such a structure if it had 

 been present. 



SPIROCELETA DAXENSIS. 



(Cantacuzfene, 1910.) 



Cantacuzene found in the water of the hot springs 

 of Dax (52 to 56 C.) a spirochaete closely resembling 

 Sp. plicatilis. It was from 30 to loo/* in length by 

 ^ to 2%n in breadth, flattened in form, and exhibited a 

 double series of curls, smaller waves being superposed 

 on the larger undulations. It possessed a longitudinal 

 chromatin filament and was narrower toward the ex- 

 tremities, but these were not actually pointed. The 



