ANATOMY OF THE LEECH. 



165 



Fig. 113. Anatomy of the medicinal leech; 

 opened from below, a, h, buccal sucker ; b, infra- 

 cesophageal sranglion; e, e,e, ventral ganglia; d, last 

 ganglion ; /,/,/. commissures joining the ganglia ; 

 ff,ff,ff, nerves of sense and locomotion ; i, oesopha- 

 gus ; k, k, k, k, the dilatations or cceca of the stom- 

 ach ; m, the last of these lobes or cceca ; p,p, intes- 

 tine lying, as well as the stomach, above the ner- 

 vous chain ; q, rectum ; r, r, r. segmental organs ; 

 , pouch ; x, sheath of 2, coupling organ ; (,, right 

 epulidymis; A, A, A, spermatic cords; B. B, B, 

 testes ; D, matrix ; E, E, ovaries ; iv, end of ovi- 

 duct; v, sucker. 



Fig. 114. Digestive canal of the same ; a, b, &, 

 ft, b, the stomach and its lateral lobes or cceca; d, c, 

 the two large coeca which extend along each side 

 of the intestine e, e ; f, rectum. After Gervais and 

 Van Benc-den. 



Pre. 113. 



