OLIGOCHMTA OF TROPICAL EASTERN AFRICA. 269 
Fic. 12.—Transverse section through cesophagus and one of calciferous 
glands of the same. ws. (sophagus. d. Duct of gland opening into it. 
a. Hxtremity of gland where nuclei are arranged in irregular portions on each 
side of a blood-vessel. 
Fic. 13.—A portion of a calciferous gland of same, more highly magnified 
to show the nuclei (z.), the boundaries of the cells (/.), and the secreted 
granules (s.). 
Fic. 14.—Extremity of calciferous gland, lettered a in Fig. 12. 
Fic. 15.—Section through a calciferous gland of Hudriloides Cotterilli. 
ce. Modified cells of gland closely investing the blood-vessels. 
Fic, 16.—Section through end of spermatothecal sac of Eudriloides 
Cotterilli. Zp. Epidermis. P/. Plug of cells occluding lumen of sac. 
m. Mesoblastic cells lining it. #. Layer of epiblastic cells, apparently in- 
vaginated to form wall of sac. 
Fic. 17.—Genital segments of Polytoreutus Finni. 9. Spermatothecal 
pore. ©. Male pore. 
Hig. 18.—Terminal male apparatus of Hudriloides Cotterilli. ¢. Atria. 
6. Male pore. s. Penial seta. a—e. Muscles referred to in text. 
Fic. 19.—Spermatothecal sac of thesame. g/. Its glandular appendices. 
Fic. 20.—Hnd of penial seta of the same. 
Fic. 21.—Terminal male apparatus of Kudriloides brunneus. v. d. 
Sperm-duct. Other letters as in Fig. 18. 
Fic. 22.—Spermatothecal sac of the same. wz. End of sac lying in front 
of external pore. g/. Glandular appendices. 
Fic. 23.—Transverse section through part of spermatothecal sac, lettered 
x in last figure. 
