er - 



&-} 



ANNELIDA. 



77 



B 



eg. 



-a/ 



Fig. 23. LEECH. A (slightly altered after Leuckart), Diagram of side- 

 dissection, showing general relation of organs. B (slightly altered 

 after Vogt and Yung), Diagram of dorsal dissection, showing relation 

 of excretory, reproductive, and nervous systems. p. ., Posterior 

 sucker; m, mouth; ph, pharynx; c 1 , first pouch of crop; c 11 , eleventh 

 pouch of crop; st, stomach; r, rectum; a, anus; l.v., lateral vessel;. 

 Ti 1 and 7i 17 , first and seventeenth (last) nephridia ; sp l and sp 9 , first and 

 ninth spermaries (testes); spd, spermiduct (vas deferens); ep, epi- 

 didymis; p, penis; ov, ovary in sac; od, oviduct; v, vagina; e.g., 

 cerebral ganglia ; g, g t g, g, ganglia of ventral chain. 



