STUDIES ON BARTHWORMS. 295 
ganglion. cé. Cilia. ce. Colom. ca. ep. pa. Somatic portion of coelomic 
epithelium. c. e. vs. Splanchnie portion of ccelomic epithelium. c/b. Club- 
shaped cells of Clitellum. co/. Columuar cells of epidermis. com. Commissural 
vessels. com'. Lateral hearts. com. al. Branches from commissural vessel of 
somite Iv to cesophagus. com. spt. Septal branches of commissural vessels. 
er. Ciliated rosette. c¢. Connective tissue. ez. Cuticle. c.v. Blind end of 
nephridial vesicle. D. Dorsal trunk of the vascular system. dd. Portions 
where the dorsal trunk has divided into two parallel vessels. d. gl. Duct 
of multo-cellular gland. d. in¢. Intestinal branches from the dorsal trunk. 
d. spt. Septal branches from dorsal trunk. d. sw. Heart-shaped double-swelling 
on dorsal trunk in somite vit. e. 2. Narrow, elongated cells of Clitellum. 
G. Gizzard. g. Subdivision of gizzard. gang. Ganglia on ventral nerve- 
chain. gd. Goblet cells in the epidermis. y.f/ Giant-fibres. g/. c. Glandular 
cells in the intestinal epithelium. g/. int. Gland on the intestine in somite Ix. 
int.ep. Epithelium of intestine. izé.s. Sacculated intestine. iné. ¢. Tubular 
intestine. 7. Wall of intestine. JZ. Lateral trunk of vascular system. 2. 
Main lumen of nephridial tubule. 7’. Secondary lumen. 7’. Smaller lumina. 
i. al. Branches from lateral trunk to alimentary tract. 7. sp¢. Septal branches 
from lateral trunk. 7. w. Longitudinal vessel in the body wall. m. Muscle. 
mir. gl, Multicellular gland. mus. cir. Circular muscles. mus. /g. Longitu- 
dinal muscles. x. Nucleus. x. B. Nerves to buccal region. wz. c. Ventral 
nerve-chain. 7. com. Circumpharyngeal nerve commissure. ze. f. Nephridial 
funnel. xe. m. Sphincter muscle at nephridiopore. ze. 0. Nephridiopore. 
neph. Nephridium. ze. ¢. Tubules of nephridium. ze. v. Vesicle of nephri- 
dium. z./i. Nerve-fibres. a. g. Ganglion. x. gc. Nerve ganglion-cell. x. /. 
Lateral nerves. x. p. Nerves to prostomium. 7. ph. Nerves to pharynx. 
nw. gl. Vascular network on intestinal gland. aw. ph. Vascular network on 
pharynx. O. Ovary. Oe. Hisophagus. @. p. Brown pigment round cesopha- 
gus. ov. Ovum. ov. /. Lobules of the ovary. yp. Pores through cuticle of 
goblet cells. PA. Pharynx. ph. v., ph. v'. Branches of the dorsal trunk on 
the pharynx. rm. Radiating muscles of the pharynx. 7. s. Rosette-sac. s. 
Septum. sem. res. Seminal reservoir. ss. /. Lateral sete. sp. a. Spermatozoa. 
spd. Sperm duct. spo. Sperm pore. spt. Branch to septum from pharyngeal 
vessel. spth. Spermathece. spth. p. Aperture of spermathece. ss. v. Ventral 
sete. 7. Typhlosolian trunk of vascular system. 7¢. Testis. 7. in¢. Intes- 
tinal branches from typhlosolian trunk. ¢. yr. Anterior prolongation of seminal 
reservoir which encloses the testis. ¢y. Typhlosole. V. Ventral trunk of vascu- 
lar system. va. Valve at the entrance of septal branch into dorsal trunk. va. c. 
Valve at exit of commissural vessel. va. 7. Valve at exit of intestinal vessel. 
v. int. Intestinal branch of ventral trunk. v. sp¢. Septal branch of ventral trunk. 
v.t.,v. ¢. Branches from ventral trunk to seminal reservoirs. w. sp. Wall of 
spermatheca. z. Funnel-shaped organ of unknown function. zp. Ciliated 
processes of funnel-shaped organ. y. Glandular organ of unknown function, 
