172 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
KD granule-gland, ME penial sheath, MO mouth, MR 
retractor muscle, OD oviduct, OT otolith, PH pharynx, 
PR proboscis, PS penis-sheath, RS  receptaculum 
seminis, T testis, TE tentacle, S stylet, SB and VS 
vesicula seminalis, SK sucker, SP spermatozoa, ST 
chitinous investment of ejaculatory duct, SP spur of copu- 
latory organ, TR investment around vesicula, UT uterus, 
VD vas deferens, VG vesicula granulorum, X muscular pit. 
PLATE XII. 
Fig. 1. Planaria alpina, Dana. Drawn from the living 
animal. Natural length ‘75—1°5 cm. (xX 2). 
Fig. 2. Planaria alpina, Dana. ‘The genital atrium 
and organs in connection with it. 
Fig. 8. Convoluta paradoza, Oe. From the living ani- 
mal, seen from the ventral surface. Natural 
length 2 mm. (X 20). 
Fig, 4. Convoluta flavibacillum, Jensen. (Partly after 
v. Graff), (x 15). 
Fig. 5. Polycelis cornuta, O. Schmidt. Anterior part of 
body (x 15). 
Fig. 6. Violet pigment-corpuscles from Aphanostoma 
diversicolor, Oe. 
7. Aphanostoma diversicolor, Garsted (X 30). 
Fig. 8. Promesostoma marmoratum, Schultze (X 25). 
9. The copulatory organ of P. marmoratum. 
Fig. 10. Promesostoma ovoideum, O. Schmidt (X 40). 
Fig. 11. Promesostoma lenticulatum, O. Schmidt (Xx 40). 
Fig. 12. Copulatory organ of P. ovoidewm. 
Fig. 138. Copulatory organ of P. lenticulatum. 
Fig. 14. Proxenetes flabellifer, Jensen. Natural length 
Ss) saouanl, (S< AQ). 
Fig. 15. Chitinous teeth from the duct of the spermatheca 
of P. flabellifer. 
