5to 



INDEX 



YELLOW-CELLS, in Leptoplana, 13 

 Yolk-gland, in Planaria, 38, 39 ; in Rhah- 



docoelida, 47 ; in Temnocephala, 54 ; 



in Polystomatidae, 57 ; in Callioboth- 



rium, 75 ; in Achistocephaltis, 86 ; in 



Rotifers, 199, 216 

 Yoruba Worm, 368, 387 

 Youatt, on Coenurus, 82 

 Yungia, 19, 25 



ZEBRA, parasites of, 140 



Zelinka, on Rotifeis, 198, 215 n., 218, 219, 



227, 229 ; on Gastrotricha, 232 

 Zooecium, 466, 469, 474, 488, 523; of 



Phylactolaemata, 495 ; loss of zooecia, 



481, (=calyces), 488; primary, 506; 



alterations with age, 522 

 Zone of budding, 279, 283 

 Zooid, sexual and asexual, 278 f. 

 Zoophytes, 465, 474 



END OF VOL. II 



Printed ly R. & R. CLARK, LIMITED, Edinburgh. 



