14 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 53. 



14 



Right side. 



15 



inverse 90° 



inverse 90° 



inverse 135° 



inverse 90° 



direct 45° 



direct 90° 



dorsal 0° 



ventral.... 180° 



16 



Center. 



inverse 45° 



direct 100"= 



Left side. 



inverse 60° 



dorsal 0° 



dorsal 0° 



direct 10 



ventral 180 



dorsal 0° 



ventral 180° 



ventral 180° 



direct 135° 



direct 90° 



inverse 90° 



ventral 180° 



ventral 180° 



dorsal 0° 



dorsal 0° 



inverse 135° 



direct 90° 



direct 45° 



inverse 90° 



dorsal 0° 



inverse 90^^ 



dorsal 0' 



direct 45° 



direct 135° 



ventral.... 180° 



In these tables there are 50 parasites from the right side of the 

 host, 44 on the median line, and 44 from the left side-a remarkab y 

 even distribution. Of the 50 from the right side 29 (57 per cent) 

 showed inverse torsion, 13 (26 per cent) showed direct torsion, and 

 the remaining 8 either showed no torsion or were twisted through 

 180° Of the 44 from the left side 19 (44 per cent) showed direct 

 torsion, 14 (32 per cent) showed inverse torsion, and the remaining 

 11 either showed no torsion or were twisted 180^ Of the 44 from 

 the median line 20 (44 per cent) showed no torsion or were twisted 

 180°, and the remaining 24 were evenly divided between direct and 

 inverse torsion. 



