STRUCTURE OF THE EARTHWORM. 



153 



b. Examine the outer surface of a piece of cuticle which 

 has been stripped off from the body of a fresh specimen, 

 and notice the fine parallel lines which cause the iri- 



FIG. 88. 



FIG. 88. Transverse section through the cesophageal region of the 

 body of Lumbricus terrestris, in the plane of a dissepiment. (Copied 

 with slight changes from Claparede. Histolof/ische Untersuchungen uber 

 den Rec/enwurm. Zeit. f. Wiss. Zool., xix. Taf. xliv. Fig. 1.) 



a. Cuticle, b. Hypodermis. c. Circular layer of muscles, d. Layer 

 of longitudinal muscles, e. Dorsal band. /. Ventral band. g. Lateral 

 bands, h. Bands between setae, j. Circular muscular fibres around 

 oesophagus, k. Circular muscular fibres around nervous system. I. Cavity 

 of ossophagus. m. Cuticle of oesophagus, n. Epithelial layer of oeso- 

 phagus, o. Layer of circular muscles around oesophagus, p. Layer of 

 longitudinal muscles, q. Dorsal vessel, r. Ventral nerve cord. 



