SYSTEMATIC DESCRIPTION OF SPECIES. 



93 



SPIROCH^TA LAGOPODIS. 



(Fantham, 1910.) 



Fantham found this spirochaete in the blood of the 

 grouse. It is from 10 to 18/1 in length, and relatively 

 broad (see Fig. 25). It is variable in form. Its ends 

 taper to points, and it has an undulating membrane, 

 spirally wound round its body. Within its substance 

 may be seen a series of chromatin bars, and sometimes a 

 helicoid core. It multiplies by both longitudinal and 

 transverse division. It may be transmitted from one 

 bird to another by the parasite, Ixodes ricinus. 



SPIROCH^TA LOVATI. 



(Fantham, 1910.) 



This organism is found in the caecum of the grouse. 

 It is from 16 to 3 2 . 5/1 in length, and its ends are usually 

 pointed, rarely rounded. It possesses an undulating 

 membrane, and multiplies by both transverse and 

 longitudinal fission. 



SPIROCH^ETA VESPERUGINIS. 



(Gonder, 1908.) 



Nicolle and Compte found spirilla 

 in a Tunisian bat (Vesperugo kuhlii). 

 The organisms are from 12 to i8/* 

 long, and /* or less in breadth ; they 

 have pointed ends and no undulating 

 membrane, and multiply by trans- 

 verse division. Crisis and relapse 

 occur, and there is enlargement of the 

 spleen; some immunity is conferred 

 by an attack. 



Nicolle and Compte regard the or- 

 ganism as a bacterium, but Gonder 

 claims it as a protozoon. The latter 

 found individuals up to 30^ in length; 

 and small forms, 3 to 5^ long, were x 2250. (Gonder.) 



p IG . 7 o. Spiro- 



