78 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



KD granule-gland, ME penial sheath, MO mouth, ME 

 retractor muscle, OD oviduct, OT otolith, PH pharynx, 

 PB proboscis, PS penis-sheath, RS receptaculum 

 seminis, T testis, TE tentacle, S stylet, SB and YS 

 vesicula seminalis, SK sucker, SP spermatozoa, ST 

 chitinous investment of ejaculatory duct, SP spur of copu- 

 latory organ, TE investment around vesicula, UT uterus, 

 VD vas deferens, VG vesicula granulorum, X muscular pit. 



Plate XII. 



Planaria alpina, Dana. Drawn from the living 



animal. Natural length "75 — 1'5 cm. (X 2), 

 Planaria alpina, Dana. The genital atrium 



and organs in connection with it. 

 Convoluta 2:)aracloxa, Oe. From the living ani- 

 mal, seen from the ventral surface. Natural 

 length 2 mm. (X 20). 

 Convoluta Jlavibac ilium, Jensen. (Partly after 



V. G-raff), (X 15). 

 Polijcelis cornuta, 0. Schmidt. Anterior part of 



body (X 15). 

 Violet pigment-corpuscles from Aplianostoma 



diver sicolor, Oe. 

 ApJianostoma diversicolor, GErsted (X 30). 

 Promesostonia marinoratum, Schultze (X 25). 

 Eig. 9. The copulatory organ of P. marmoratum. 

 Eig. 10. Promesostonia ovoideum, 0. Schmidt (X 40). 

 Eig. 11. Promesostoma lenticulatuni, 0. Schmidt (X 40). 

 Eig. 12. Copulatory organ of P. ovoideum. 

 Eig. 13. Co^iilsitoiy 01 gMi oi P. lenticulatum. 

 Eig. 14. Proxenetes flahellifer, Jensen. Natural length 



1-75 mm. (X 20). 

 Eig. 15. Chitinous teeth from the duct of the spermatheca 

 of P. flahellifer. 



