86 SPIROCH^TES. 



SPIROCH^TA PECTINIS. 



(Cristispira pectinis, Gross, 1910.) 

 Gross found spirochaetes free in the alimentary canal 

 of the mollusc, Pecten jacob&us. They were 72/1 long, 

 and 1.5/1 thick, round in section, with blunt ends. 

 They had a ridge or comb (kamm, crista) running along 

 one side, but no terminal filaments. They seemed to 

 consist of a series of chambers placed one behind the 

 other, like a filament of some alga. 



SPIROCH^ITA INTERROGATIONS. 



(Cristispira interrogationis, Gross, 1910.) 

 This organism was also found by Gross in Pecten jaco- 

 b&us. It is 25/4 in length by 0.5/1 in breadth, and has 

 pointed ends, bearing apparently to Sp. pectinis a rela- 

 tion similar to that of Sp. spiculifera to Sp. anodontcs. 



SPIROCH^ETA POLYSPIRA. 



(Wolff, 1907.) 



This organism was found by Wolff in putrid potato 

 and grows on ordinary media. He describes two 

 forms : one with sixty to seventy curls, 70 to 8o/z long 

 by 1.5 to i. 6/1 broad, which multiplies by longitudinal 

 division, and a second 140/1 long by 0.25 to 0.3/1, with 

 sixty to eighty curls. Wolff is inclined to class this 

 organism as a treponema. It is placed here on account 

 of its length, but should perhaps rather be included with 

 the small spirochaetes. 



SMALL SPIROCHJETES OR SPIRILLA. 



SPIROCH-ffiTA OBERMEIERI. 



(Cohn, 1877.) 



(Sp. recurrentis, Lebert, 1874.) 



According to the recent descriptions of Novy and 

 Knapp and other observers this spirochsete or spiril- 



