64 DR J. STEPHENSON ON 
Fic. 3. Part of the anterior end of Lumbricillus subterraneus. 
Comm.}, communicating strand from septal gland of the fifth to that of the fourth segment ; spth., 
spermatheca (duct and ampulla not distinguishable). Other references as for fig. 5. 
Fic. 4, Transverse section of ventral nerve-cord and ‘copulatory gland’ of Lumbricillus subterraneus. 
x 640. 
b. bridge of deeply staining tissue connecting the two sides of the gland dorsal to the cord; «., 
central canal of the nerve-cord; ¢.m., circular muscular layer; ep., surface epithelium, in 
which cell outlines are indistinguishable ; gl., a cell of the copulatory gland, the body of the 
cell staining equably; gl.1, another gland-cell, the cell body showing a reticular structure and 
staining very slightly ; /.m., longitudinal muscular layer ; x., fibrous part of nerve-cord, below 
and to the right of which are seen the granular nuclei of the ganglion cells; sé., ‘stalk’ of 
attachment of copulatory gland to the surface epithelium. 
Fic. 5. Longitudinal section through spermathecal apparatus of Lumbricillus subterraneus. x 220. 
Al., alimentary canal; amp., ampulla of spermatheca; ap., aperture of its duct; ¢. circular 
muscular layer of body-wall; d., duct of spermatheca; ep., surface epithelium; gl., gland- 
cells near aperture of spermatheca ; /., longitudinal muscular layer of body-wall ; m., muscular 
layer of duct of spermatheca ; m.1, the same layer between the cells, where these are elongated 
and glandular; s.g/., septal gland; spz., spermatozoa in ampulla of spermatheca. 
Fic. 6. Longitudinal section through male aperture of Lumdricillus tuba. x 250. 
Cl., clitellar epithelium; ep., lower, more deeply staining epithelium round male aperture; m., 
muscular capsule of penial gland; m.!, muscular strand of attachment, cut through; v.d., vas 
deferens ; ¢, male aperture. ; 
lie, 7. Longitudinal seetion through ampulla and first part of duct of spermatheca of the same. x 250. 
Amp., ampulla; d., duct; ws., cesophagus ; s.gl., septal gland of fourth segment. 
Fie. 8, Longitudinal section through aperture of duct of spermatheca of the same, to show the continuity 
of the surrounding gland-cells with the cells of the surface epithelium and of the duct, and their relation to the 
muscular layer. x 250. 
M., muscular layer clothing duct, continued ventrally between gland-cells; s.g/., septal gland. 
Fie. 9. Anterior part of the body of Hnchytreus nodosus, semi-diagrammatic. 
Amp., ampulla of spermatheca ; ¢.g., cerebral ganglion; con., connection between septal glands 
and pharynx ; conn.!, that between the glands of segments v. and iv.; d., duct of spermatheca ; 
y., gland-cells round aperture of spermatheca; m., muscular strands attaching pharynx to 
body-wall; @s., cesophagus; ph., pharynx; s.gi.+*, septal glands of segments iv.—vi.; vac., 
vacuole-like appearances in posterior part of cerebral ganglion. 
Fic. 10, Transverse section through male aperture of the same. x 550. 
Cl., clitellar epithelium ; cut., cuticle ; ep., lower, non-glandular epithelium over area around and 
between male apertures; znvag., the invagination representing the male aperture, at the 
place where it receives the termination of the vas deferens; m., muscular strand from penial 
bulb to body-wall; m.1, muscular covering of penial bulb; p., cells of penial bulb; v.d., vas 
deferens before penetrating penial bulb; v.7.c., ventral nerve-cord. 
Fic. 11. Longitudinal (somewhat oblique) section through spermatheca of the same. x 640, 
Axip., cells composing wall of ampulla; ¢.m., cireular muscle layer of body-wall; cuwt., cuticle ; ep., 
surface epithelium; g., gland-cells near aperture of spermatheca; /.m., longitudinal muscle 
layer of body-wall ; per., peritoneal cells ; s. gl., septal gland of segment iv. ; spz.!, spermatozoa in 
ampulla ; spz.?, spermatozoa between cells of wall of ampulla ; s7z.°, spermatozoa outside ampulla. 
Fic, 12. Longitudinal section through segment xi. of a specimen of Ha hytreus dubius. x 250. 
B.-v., a blood-vessel ; corp., ecelomic corpuscle ; dis,, dissepiment +4; 7., sperm funnel; sp., mass 
of developing sperm cells ; ¢., testis at its attachment to septum 1°; ¢.!, other portions of the 
branching testis. 
Fic. 13. Longitudinal section through spermatheca of Enchytreus dubius. x 250. 
Amp., small dilatation, with thinner walls, at oesophageal end of spermathecal apparatus, representing 
the ampulla; ¢., circular muscular fibres of body-wall; ws., esophagus; s.gl., septal glands; spth., 
main portion of spermathecal apparatus, representing the duct ; v., vacuole in surface epithelium. 
