Fic. 
EXPLANATION OF PLATE XXVI. 
14.—Atopos sanguinolenta, portion of epithelial layer of 
digestive gland, xX 105; 1, goblet cell. 
15.—A transverse section of the wall of digestive gland 
(diagrammatic). 
16.— Section of accessory digestive gland, (stained with 
eosin and haemotoxylin), x 255. 
17.—Female genital organs (dorsal view), X 2; 1, her- 
maphrodite gland; 2, albumen gland; 3, vagina; 
4, visceral artery. 
18.—Female genital organs, etc. (ventral view, with vagina 
unfolded), X 2; 1, hermaphrodite gland: 2, al- 
bumen gland; 3, vagina; 4, visceral artery; 5, 
receptaculum seminis; 8, anterior limit of pallial 
chamber; 7, kidney; 8, ventricle. 
19.—Left Simrothian gland, X 2. 
20a.—-Male genital organs, X 2; I, retractor penis muscle 
2, penial sheath; 3, right Simrothian gland; 4, 
flagellum. 
20b.— Longitudinal section of penis and penial sheath, 
X 2; 1, penis; 2 penial sheath. 
21.—Section of hermaphrodite gland, X 124; 1, ovum; 2, 
sperm-mother cells; 3, developing spermatozoa ; 
4, free mature spermatozoa. 
22.—Section of a mature ovum, X 124. 
23.—A mature spermatozoon, X 756. 
24.—Transverse section of the first portion of the right 
Simrothian gland, X 50. 
