328 THE GROUSE IN HEALTH AND IN DISEASE 



at least two components : (i.) An undulatory flexion of the body, mainly for 

 progression, and (ii.) a spiral or corkscrew movement of the body as a whole, due to 

 the winding of the membrane." S. lovati has a small, but distinct undulating 

 membrane best seen in stained preparations (PI. XLVIII., Figs. 51-57). The ends of 

 the organiser are pointed, the length of the body being from 16 '5^ to 32 '5^. 



In some very narrow forms the relatively long body may be thrown into many 

 waves (Fig. 53), but usually four to seven waves occur along the body (Figs. 51, 52, 

 55). The membrane with its chromatic border is often closely contracted against 

 the body (Figs. 53, 55). The chromatin of the Spirochsete is usually present in the 

 form of a number of bars (Figs. 51-57), which are probably disposed on a helix 

 as is typical for Spirochsetes. 



After examining many specimens of the parasite it was seen that S. lovati 

 exhibits morphological variation. Thus, the ends of the body usually taper (Figs. 

 58-59), but occasionally are somewhat rounded (Figs. 51, 52). Also the Spirocbsetes 

 are of different lengths and breadths, the results of growth and division. 



Multiplication of S. lovati by both longitudinal and transverse division has been 

 seen in life. The division resembles that of S. recurrentis and S. duttoni, where a 

 periodicity in the direction of division occurs (Fantham and Porter, 1909). Broad 

 Spirochsetes (Fig. 51) have been seen to divide longitudinally (Fig. 56). Longer 

 Spirochsetes (Fig. 54) often divide transversely (Fig. 57), elongating somewhat as 

 they do so. 



The modes of multiplication and the processes of growth are of the utmost 

 importance in elucidating the morphological variation of Spirochsetes. 



(c) Rhizopoda. 



AMCEBA (ENTAMCEBA) LAGOPODIS, sp. n. 



Living amoebae were seen by Dr Shipley (1908-1909) in fresh faeces of Grouse. 

 I have, on a few occasions, observed amoebse in the recently voided faeces and in 

 the rectum and intestine of Grouse. The living organism was examined both with 

 and without staining intra vitam, and a few stained preparations were made with 

 Delafield's hsematoxylin after fixation with corrosive-acetic-alcohol or osmic vapour, 

 but the whole of the material was very scanty. 



In structure the amoeba exhibits ectoplasm and endoplasm fairly well 

 differentiated (PI. XLVIII., Figs. 58-63). The amoeba moved slowly by sending out 

 pseudopodia in the manner usual to these organisms, the pseudopodia being first 



