300 WILLIAM BLAXLAND BENHAM. 
Fie. 32.—A transverse section across a nephridial tubule near its origin 
from the vesicle. Three main lumina (/.) are shown. There are here no 
smaller lumina, and the connective tissue (c. ¢.) is somewhat vesicular, and 
the cell boundaries are evident. dv. are the blood-vessels in the connective 
tissue. Round the pierced cells of the tubule is a sort of sheath of flat cells 
(ct’.) whose nuclei are seen. 
Fic. 83.—A section across a nephridial tubule further away from the vesicle. 
A main lumen (/.) is seen with a thick wall, corresponding to /. in Fig. 32 ; 
and in addition are secondary (/’.) and smaller lumina (/".) which communicate 
with one another. The boundaries of the connective-tissue cells are not 
evident in this region, but their nuclei (w.) are shown. Jv. are the blood- 
vessels. 
Fic. 34.—The cerebral and two ventral nerve ganglia from above, showing 
the nerves coming from them. c.g. Cerebral ganglia. z.B. Nerves from the 
commissure (z. com.) to the buccal region. 2. g’., x. g'. The first and second 
ganglia of the ventral chain. 2. 7, Lateral nerves from the ganglia. x. p. 
Nerves from the cerebral ganglia tothe prostomium. z. ph. Nerves from the 
cerebral ganglia and from the commissure to the pharynx. 
Fic. 35.—The cerebral and first ventral ganglia from the side, together 
with the buccal region (B.) and pharynx (pf.). Letters as before. 
Fie. 36.—A portion of the ventral nerve-cord, with three ganglia (gang.), 
and the lateral nerves (z. 7.) coming off, some from the ganglia, others from 
the nerve-cord. 
Fic. 37.—Transverse section through a ganglion. c. ep. Nuclei of the 
coelomic epithelium. c.¢. Connective tissue. g./ Three giant-fibres. m. 
Sections of longitudinal muscles at each side. . yg. c. Ganglion-cells, each 
lying apparently in a separate space in connective tissue. 2. fi. Nerve-fibres. 
n. 1. Lateral nerve leaving the ganglion. sf. Sheath of the nerve-cord, with- 
out muscles. 
Fre. 38.—Transverse section through the nerve-cord between two ganglia. 
Letters as before. z. Nuclei of connective tissue. 
Fic. 39.—A portion of a transverse section through the body wall. dz. 
Blood-vessels. co/. Columnar epithelial cells. ca. ep. par. parietal coelomic 
epithelium. c. ¢. Connective tissue between the muscle strands, and forming 
spaces in which the longitudinal fibres lie. cw. Cuticle. d.gl. Ducts of the 
deep-lying multicellular glands; these ducts pass into, and probably through, 
the epidermic layer. gd. Goblet-cells of the epidermis. Jy. f Cut ends of 
fibres of the longitudinal muscles. mr. g. Multicellular glands, lying in spaces 
amongst the longitudinal muscles. mus. circ. Circular muscular layer mus. Ig. 
Longitudinal muscular layer. m.. Basement membrane. P. 6. Goblet-cell. 
Fic. 40.—A portion of the epidermis much more enlarged, showing the 
contents of the goblet-cells and the network of their protoplasm (d.c.). In 
some cases there appear to be more than one nucleus in these cells (as at a.), 
