THE EARTHWORM. 



PLATES XI., XII. 



THE EAKTHWORM. 



a. Anus. 



lit: Buccal sao. 



In''. Muscles of the same. 



hi. Passive portion of spermatozoid forming 



body. 



c. Cuticle. 



cy. Clitellum. 



c.l. Longitudinal nerve-commissure. 



cm. Circular blood vascular commissure. 



cm'. Interneural blood vascular commissure. 



CM. Circumcesophageal nerve-commissure. 



I'M. Epitheloid lining of alimentary canal. 



(.of. Subepitheloid vascular layer of the same. 



e.c. 'Ciliated epithelium. 



f.m. Mesentery of excretory organ. 



c//. " Hypodermis." 



i'li' . Cells of the same. 



i'x. Epithelium of excretory (segmental) organ. 



(.I.-. Blood-vessels of excretory organ. 



c.c'. Excretory plexus. 



.//. Flagelluin. 



ij.c. Supraa-sophageal ganglion. 



ij.i. First ventral ganglion. 



;//. Cutaneous glands. 



<//'. So-citlled capsulogeneous glands. 



i/l". Gland at base of vas deferens. 



;i. n. Ganglionic swellings, 



i/.r. Germinal vesicle. 



ijz. Gizzard. 



A. So-called " hearts." 



lip. So-called " liver." 



i. Intestine. 



i'. Intestinal sacculie. 



/./. Lateral intestinal blood-vessel. 



/./'. Loop of hepatic tissue surrounding the 



same. 



i.. Supra intestinal vessel. 



/..s'. Subintestinal vessel. 



HI. Mouth. 



ni.c. Circular muscles of body wall. 



in.c.' Circular muscles of alimentary canal. 



ni.c". Circular fibres of mesentery. 



m.l. Longitudinal muscles of body-wall. 



>n. I'. Longitudinal muscles of alimentary canal. 



HI.I: Radiating fibres of mesentery. 



m.s. Mesenteric septum. 



n.. Circumneural arcade. 



nc. Nucleus. 



no'. Corpuscles of red blood. 



nc' . . Heads (nuclei) of developing spermatozoa. 



n. e. Nerve-cells. 



/(.;/. Ganglionic nerves. 



n.it/. luterganglionie nerves. 



n. I. Lateral neural vessel. 



n.s. Supraneural vessel. 



n.s'. Subneural vessel. 



oil. Oviduct. 



od'. Internal aperture of the same. 



od". External aperture of the same. 



IB. Oesophagus. 



'. Crop. 



n:.y. Gisophageal (calciferous) glands. 



ix.g'. Apertures of the same. 



IK. I. Lateral oesophageal blood-vessel. 



of. Ovary. 



uc'. Young ova. 



01". Ripe ovum. 



I*. Peritoneal membrane. . 



2>.d. Dorsal porf. 



pg. Pigment. 



lih. Pharynx. 



ph'. Muscles of the same. 



ph". Sucker-like fold of pharynx. 



p.m. Protractor muscles of seta2. 



p.s. Prostomiurn. 



pr.s. Peristomium. 



i-.in. Retractor muscles of setse. 



*.' Functional seta. 



*''. Follicle, bearing young setse. 



sy. Segmental organ. 



sy'. Its thin-walled segment. 



sy". Its thick-walled segment. 



sy"'. Its muscular segment 



sy.e. External aperture of segmental organ. 





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