Explanation of Plates. 
Plate 37 (Figs. 1—8). 
Fig. 1 Y € 9 of Sch. haematobium. The 
© contains many eggs with ter- 
minal spine.X28. Copied from 
FRITSCH: 
2 ditto. The 9 shows the intestine 
double till near to the caudal 
end. Copied from BILHARZ. 
33 & 9 of Sch. Mansoni. The 
balsam-preparation shows clearly 
the bifurcarted intestine which 
in both sexes unites before the 
middle of the body.X50. Orig. 
4 © of Sch. M., first third of the 
body, showing only one egg with 
lateral spine.xX(40. Haematoxylin 
stain. Orig. 
5 & of Sch. M. showing the testi- 
cular apparatus. X<20. Orig. 
6 Another Y of Sch. M. showing 
the same in three different po- 
sitions. 60. Orig. 
7 a,b. Two oo of Sch. M. sho- 
wing the common appearance 
of eight testicular lobes. No sign 
of a vesicula seminalis. 60. Orig. 
8 of Sch. haematobium copied from 
BILHARZ. 
Plate 38 (Figs. 9—38). 
Fig. 9-14 Abnormal eggs of Sch. M. 
9—11 Shell with protruded an- 
terior pole, liable to be mistaken 
for a terminal spine ; 12 egg with 
two spines; 13 crystals deposi- 
ted on egg shell; 14 calcified egg. 
150. All the eggs were voided 
by patients infected in the north 
of Brazil. 
« 15 Normal egg of Sch. M. showing 
the embryo. 400: 
« 16 Miracidium observed some time 
after ecdysis.--Stained prepara- 
tion. 400. 
« 17 Miracidium which failed to pene- 
trate a long time after ecdy- 
sis. <400. 
139 ——— 
« 
«4 
« 
18 Miracidium attacking the antennae 
two have already penetrated. x 
200. 
19 Planorbis olivaceus with normal» 
20 & 21 with infected antennae. 
The specimens are halfgrown. 
Natural size. 
22-38 Aspect of antennae in various 
degrees of infection. Figs. 19— 
27 in nat. size, 29-38 somewhat 
enlarged. Fig. 32 shows a nor- 
mal antenna. All the drawings 
are original and, with exception 
of 32, taken from fresh or living 
specimens. 
Plate 39 (Fi s. 39—47). 
Fig. 39 a young sporocyst inside of the 
« 
2 
a 
Rr 
antenna showing the 4 tubular 
orifices with vibrating membra- 
ne and the ciliated epithelium 
half detached, b the same more 
developed with initial state of 
secundary sporocysts.<100. 
40 Almost mature primary sporocyst, 
the young second generation es- 
caping through a tear of the an- 
tenna under compression. 150. 
41 Section through an antenna con- 
taining an aimost mature prima- 
ry Sporocyst. Haematoxylin stai- 
ning. <150. 
42 Secondary sporocyst.X500. 
43 — 45 Secondary sporocysts, more de- 
veloped, from the internal organs 
of Planorbis. Lateral illumination. 
46-47 Ditto, seen by transparency. 
All the drawings are original 
and taken from fresh prepara- 
tions, with exception of 41. 
Plate 40 (Figs. 48—63). 
48 Section of liver of an infected 
Planorbis showing an almost 
Tipe cercaria in longitudinal se- 
tion- Stained preparation. X250. 
49 & 50 Ditto showing cuts of se- 
condary sporocysts. X700. 
51 Living cercariae of Sch. M.X30. 
