J 



THE EARTHWORM. 



47 



PLATES XI., XII. 



THE EARTHWORM. 



a. Anas. 



lie. Unreal sac. 



be'. Muscles of the same. 



lit. Passive portion of spermatozoid forming 



body. 



e. Cuticle. 



cy. Clitellum. 



c.l. Longitudinal nerve-commissure. 



em. Circular blood vascular commissure. 



cm'. Interneural blood vascular commissure. 



CM. Circumcesophageal nerve-commissure. 



CM. Epitheloid lining of alimentary canal. 



c.'. Subepitheloid vascular layer of the same. 



e.e. Ciliated epithelium. 



e. in. Mesentery of excretory organ. 



e/i. " Hypodermis." 



ep'. Cells of the same. 



ex. Epithelium of excretory (segtnental) organ. 



t.i 1 . Blood-vessels of excretory organ. 



<.(/. Excretory plexus. 



Jl. Flagellum. 



ij.e. Supraoesophageal ganglion. 



<j.i. First ventral ganglion. 



ijl. Cutaneous glands. 



yi. So-culled capsulogeneous glands. 



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



IJ.H. Gauglionic swellings. 



ij.t. Germinal vesicle. 



ijz. Gizzard, 



/i. So-called " hearts." 



lip. So-called " liver." 



i. Intestine. 



i'. Intestinal sacculiu. 



/./. Lateral intestinal blood-vessel. 



('./'. Loop of hepatic tissue surrounding the 



same. 



/.*. Supra intestinal vessel. 



t..s'. Subintestinal vessel. 



HI. Mouth. 



in.<: Circular muscles of body wall. 



tn.c.' Circular muscles of alimentary canal. 



m.c'. Circular fibres of mesentery. 



m.l. Longitudinal muscles of body-wall. 



in. I'. Longitudinal muscles of alimentary canal. 



m.r. Radiating fibres of mesentery. 



HI.*. Mesenteria septum. 



n.a. Circumneural arcade. 



iic. Nucleus. 



c'. Corpuscles of red blood. 



tic 1 . Heads (nuclei) of developing spermatozoa. 



n.c. Nerve-cells. 



n. ;i. Gaugliouic nerves. 



ii.iij. Interganglionic nerves. 



/i./. Lateral neural vessel. 



H.S. Supraneural vessel. 



.*'. Subueural vessel. 



od. Oviduct. 



/'. Internal aperture of the same. 



ml". External aperture of the same. 



<e. (Esophagus. 



<'. Crop. 



".//. (Esophagoal (calciferous) glands. 



ix.ij'. Apertures of the same. 



<./. Lateral ojsophagoal blood-vessel. 



ue. Ovary. 



ov'. Young ova. 



or/'. liipe ovum. 



ji. Peritoneal membrauc. 



fi.d. Dorsal porr. 



j>y. Pigment. 



ph. Pharynx. 



)</('. Muscles of the same. 



ph.". Sucker-like fold of pharynx. 



p.m. Protractor muscles of seta,'. 



p.g. Prostomium. 



/>r.*. Peristomium. 



;.///. lietractor muscles of seta,'. 



*.' Functional seta. 



*. Follicle, bearing young seta;. 



sy. Segmental organ. 



ty'. Its thin-walled segment. 



*y". Its thick-walled segment. 



</'". Its muscular segment 



ttj.e. External aperture of segmental organ. 



