100 SPIROCILETES. 



in the large intestine of the toad, which he compares 

 with Sp. pallida and regards as a treponema, but the 

 illustrations which he gives do not show the same regu- 

 larity of curls. 



SPIROCH^TA BUCCALIS. 



(Cohn, 1877.) 



Several spiral organisms are found in the human 

 mouth. The largest of these, Sp. buccalis, is from 12 



FIG. 74. Mouth spirochaetes. (Spirochaeta buccalis.) 





FIG. 75. FIG. 76. 



FIG. 75. Spirochaeta buccalis: a, c, Showing sheath; b, with 

 terminal filament; a 1 , Spirillum sputigenum. (Hoffmann and 

 Prowazek.) 



FIG. 76. Spirochaeta buccalis (below). Spirochaeta dentium 

 (above). X 2200. (Schaudinn.) 



to 20fi in length and to i/i broad (Figs. 74, 75, 76). 

 It exhibits long undulations (wave-length 2 p., Miihlens 

 and Hartmann) rather than short curls, and is active in 



