SYSTEMATIC DESCRIPTION OF SPECIES. 



81 



organism is built up of a series of chambers arranged 

 longitudinally. Rolled up forms occur which may 

 possibly represent cysts. He also believes that multi- 

 plication is by transverse, not by longitudinal division 

 (Fig. 28), but I have seen 

 a spirochaete apparently in 

 process of longitudinal 

 fission. 



The blunt and pointed 

 forms described by Keys- 

 selitz are held by Schel- 

 lack to constitute different 



FIG. 62. 



FIG. 62 a. 



FIG. 62. Spirochasta anodontae; specimen with blunt extremi- 

 ties; different sizes. 



FIG. 620. Spirochaeta anodontse (Sp. spiculifera) forms with 

 pointed ends; different sizes. 



species ; to the latter he gives the name Sp. spiculifera 

 (Fig. 61). He describes a long form, from 39 to 50. 5// 

 long and o . 9 to i . 2ju broad (average, 46/1 by i/x), and a 

 sharp-pointed form, 28 to 36^ long and 0.7 to i . i/t 

 broad (av. 32^ by 0.9^). In my own experience four- 

 teen specimens with blunt ends gave an average length 

 of exactly IOQ/J. (extremes, 130 and 76jw), while of fifteen 

 sharp-pointed specimens the average length was 55.6^ 



