ANATOMY OF THE LEECH. 



227 



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FIG. 150. 



Fig. 149. Anatomy of the medicinal leech ; 

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

 oesophageal ganglion; e,e,e, ventral ganglia; d, last 

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

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

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

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

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

 vous chain ; q, rectum ; r, r, r, eegmental organs ; 

 , pouch ; x, sheath of z, coupling organ ; t, right 

 epididymis; A, A, A, spermatic cords; B, B, B, 

 testes ; Z>, matrix ; JS, E, ovariea ; w, end of ovi- 

 duct; v, sucker. 



Fig. 150. Digestive canal of the same ; a, 5, 6, 

 b, b, the stomach and its lateral lobes or coeca; d, C, 

 the two large co?ca which extend along each side 

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

 Van Beneden. 



FIG. 149. 



