( 254 ) 
EXPLANATION OF FIGUEES OF PLATES XV.-XVII. 
h.p.a = aperture of brood pouch. 
b.p.h.a = anterior horn of brood pouch. 
hr.p = brood pouch. 
d.s = dorsal sinus. 
caec — caecum of crop. 
h = ejaculatory horn. 
n. {vide figs. 4 and 10). 
n.c = nerve cord. 
oe = oesophagus. 
oe.c — crop. 
ov = ovary. 
ov.d = oviduct passing downwards towards the obsolete female pore (this represents the 
true oviduct of other Glossiphoniidae). 
p = proboscis. 
p.s — proboscis sheath. 
s. {vide figs. 2 and 10). 
t = testis. 
^3*4 = position of third or fourth pair of testes. 
v.d = vas deferens. 
v.s = vesicula seminalis. 
X {vide figs. 2, 10, and 11). 
y {vide figs. 3 and 10). 
z {vide figs. 3 and 10). 
ep = external epithelium of ovary, passing into muscular tissue {epjn) comparable 
with lining layer of brood pouch. 
Figs. 
1-9. Represent transverse sections through the more characteristic regions from the 
anterior end to the middle of the brood pouch. 
10. Reconstruction of the male genital apparatus (compare with figs. 1, 2, 3, and 4). 
11. Diagrammatic sagittal section to show the relations of the alimentary canal and 
female genital organs. 
12. Reconstruction of brood pouch (in ground plan), 
13. Transverse section through ovary, to show the relations of ovary, oesophagus, and 
dorsal sinus inter se. 
14. Photograph of section showing segmenting eggs in brood pouch. 
15. Photograph of transverse section through brood pouch containing fully developed 
young. Note the deeply stained crop caeca in the young and the testes and 
large sinuses in the lateral body wall of the adult. 
16. Photograph of transverse section through the brood pouch, passing through the pore. 
Note the extrusion of a young individual through the pore and the testes (3rd or 
4th pair) in the lateral body wall of the adult. 
