150 THE LEECHES OF MINNESOTA 



Semiscolex 



grandis 117 



terrestris 113 



Sense organs 14 



Somite 10 



limits of 11 



Spermaries 20 



Spermatofore 20 



Stomach 18 



Stomatogastric nerve 45 (E) 



Sub-esofageal ganglion 19 



Supra-esofageal ganglion 19 



Sympathetic nervous system 38, 39, 40 



Testes 20 



Vas deferens 20 



Ventral nerve cord 20, 41 



