PLATE XIII. 



Class CHJETOPODA. 



THE EARTHWORM (Lumbricus terrestris). 



FIG. 1. ANTERIOR END : VENTRAL VIEW, x 2. 



p. prostomium : m. mouth: s. setse: s. 1 , s.~ openings of spermathecae : 

 o. opening of oviduct : v. opening of vas deferens. 



FIG. 2. CLITELLUM : VENTRAL VIEW, x 2. 

 FIG. 3. POSTERIOR END : VENTRAL VIEW, x 2. 



FIG. 4. DISSECTION FROM THE DORSAL ASPECT, x 2. 



&. buccal mass: g. cerebral ganglia: p. pharynx: Ji.^-k. 7 the seven 

 pairs of hearts surrounding the oesophagus : s. spermatheca : 

 s. v. seminal vesicles : d. dorsal blood-vessel : c. crop : yd. 

 gizzard : i. intestine covered by the " liver " 



FIG. 5. SEGMENTAL ORGAN, x 15. 



FIG. 6. REPRODUCTIVE ORGANS, x 2. 



s.v. seminal vesicles (the position of the testes t. underneath the 

 seminal vesicles is outlined) : s. spermatheca : o. ovary : od. 

 oviduct : v. vas deferens. 



FIG. 7. NERVOUS SYSTEM : ANTERIOR END. x 4. 



c. cerebral ganglia : cm. commissure : g., g. ganglia giving off nerve 

 cords to the segments : n., n. nerve cords to the septa. 



FIG. 8. TRANSVERSE SECTION THROUGH THE BODY, x 4. 



m. muscles of the body wall: v. 1 dorsal or supra-intestinal vessel: 

 t. typhlosole projecting into i. intestine: g. glandular tissue 

 "liver": c. body cavity: v. 2 sub-intestinal vessel : n. nerve 

 ganglion: s. setae: v. 3 sub-neural vessel. 



