ANATOMY OF THE LEECH. 



227 



w-\ 



Fig. 150. 



Fig. 149.— Anatomy of the medicinal leech ; 

 opened from below, a, A, buccal sucker ; 6, infra- 

 cesophageal ganglion; e, e,e, ventral ganglia; rf, last 

 ganglion ;/,/,/, commisf^ures joining tne ganglia ; 

 Q^ 9-, f7i nerves of sense and locomotion ; i, cesopha- 

 giis ; 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 ; 

 s, pouch ; X, sheath of s, coupling organ ; t, right 

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

 testes ; D, matrix ; ^, E, ovaries ; w^ end of ovi- 

 duct; V, sucker. 



Pig. 150.— Digestive canal of the same ; a, b, 5, 

 &, 6, tne stomach and its lateral lobes or cceca; d, c, 

 the two large cceca which extend along each side 

 of the intestine e, e; /, rectum.- After Uervaie and 

 Van Beneden. 



Fig. 149. 



