i8o 



LEECHES. PHYLUM ANNELIDA 



^.S. 



Fig 128.— The medicinal leech [Hirudo medicinalis) , and details of its anatomy. 



A Vrntral view • B dorsal view of hinder end ; C, dorsal view of head and succeeding region ; D, female 

 ' i.".,t.,l orL'.it'is ; E, anterior view of nephridium ; F, nervous and genital organs (male organs of right 



as .,, i^'-- "^'' ■' albumen gland ; an., anus ; bl., bladder ; e.g.. cerebral ganglion ; e., eyes; 



■ " ep ad ganglion of ventral cord ; j., jaws ; m., mouth ; np., nephndiopore, by 



,i,, .„.. iii ; od.. oviduct ; ov., ovary ; p., penis; pr., prostate ; p.s., posterior sucker; 



. ; s.ph.g., subpharyngeal ganglion ; /., testes ; t.l., lobe of nephridium which ends in 



lUi , L.U.. vas deferens ; v.n.c, ventral nerve cord ; vag.. vagina ; <J male opening ; ? female 



; 1-26, somites. 



