70 
Bilharziasis 
DESCRIPTION OF PLATES III—V. 
BILHARZIA CERCARIAE AND ALLIED SPECIES FOUND IN EGYPT. 
PLATE III. 
Fig. 1. Lateral spined ovum of 8. mansoni : measurement 0T6 mm. x 0-06 mm. 
Fig. 2. Terminal spined ovum of 8. haematobium : measurement 0T5 mm. x 0 056 mm. 
Fig. 3. Fork-tailed Cercaria of 8. mansoni, from liver of Planorbis boissyi, showing anterior and 
ventral suckers, mouth armature, six pairs of poison cells, unpaired glandular structure 
situated in front of ventral sucker, and posterior pairs of flame cells. 
Compiled from average measurements of 40 specimens. 
Measurements: 
Total length from anterior sucker to fork 0-374 mm. 
Body 0-161 mm. x 0-060 mm. 
Antero-posterior measurement of anterior sucker 0-053 mm. 
Posterior sucker situated 0-044 mm. from posterior border of body. 
Length of tail to fork 0-213 mm. Length of fork 0-066 mm. 
Fig. 3 a. Side view of Head of Cercaria of S. mansoni, showing appearance of ventral sucker. 
Fig. 4. Fork tailed Cercaria of 8. haematobium from liver of Bullinus dybowski, showing interna 
structure as in 3, with three pairs of poison cells. 
Compiled from measurements of 35 specimens. 
Total length 0-398 mm. Body 0-190 mm. x 0-064 mm. Antero-posterior measure 
ment of anterior sucker 0-073 mm. 
Posterior sucker 0-049 mm. from posterior border. Length of tail 0-208 mm 
Length of fork 0-081 mm. 
Fig. 4 a. Side view of Head of Cercaria of S. haematobium showing oval shape of anterior suckei 
and protrusion of ventral sucker. 
Fig. 5. Unpigmented fork tailed Cercaria without eye spots, from liver of Planorbis mareoticm 
from the Zoological Gardens, Cairo. ( Bilharziella) ? 
Compiled from measurements of 6 specimens. 
Total length 0-296 mm. Body 0-119 mm. x 0-043 mm. 
Tail 0-117 mm. Fork 0-044 mm. 
Fig. 6. Sporocyst of 5 from Planorbis mareoticus, 0-119 mm. x 102 mm. 
Fig. 7. Fork-tailed Cercaria from liver of Bullinus dybowski taken in sweet-water canal. 
Total length 0-311 mm. Body 0-119 mm. x 0-031 mm. Tail 0-192 mm. 
Fork 0-150 mm. 4 % of snails taken on 2. viii. 17 infected. 
Fig. 8. Sporocyst of 7 showing yellow pigmented granules in cyst wall. 
Average length of mature sporocyst 0-678 mm. x 0-075 mm. 
Fig. 9. Cercaria found in 10 % of livers of Cleopatra bulimoides described and figured by Loos 
as Cercaria cellulosa, sp. inq. ( Rech. sur la faune para-sit. de VEgypie, text page 227, Plate XL 
figs. 159-161). 
Average total length 0-192 mm. Body 0-102 mm. x 0-06 mm. 
Tail 0-09 mm. 
Fig. 10. Sporocyst of 9; Average measurement 0-210 mm. x 0-13 mm. 
Fig. 11. Cercaria from liver of Limnaea caillaudi from the Zoological Gardens, Cairo. (12 % ii 
fected.) Total length 0-310 mm. Body 0-195 mm x 0-086 mm. Tail 0-114 mm. Resembles 
structure Cercaria pusilla described by Looss. 
