ZooL— Vol. III.] 



STEVENS— CILI ATE INFUSORIA. 



^9 



L. auerbachii. 



1. Ectoparasitic 



2. Detached with difficulty, disin- 

 clined to free swimming, and con- 

 fused in its movements when de- 

 tached. 



3. Attachment disc bordered by 

 a single striated membrane. 



4. Ciliary membrane of attach- 

 ment disc loses coordination when 

 split up. 



5. A "Haftring" with overlap- 

 ping ends. 



6. Ventral side of the attachment 

 disc jagged ("ojemt naggad"). 



7 . Long diameter of mouth-open- 

 ing nearly parallel with long axis of 

 the body. 



8. No such structures yet de- 

 scribed [Probably present. " Im 

 Fuss habe ich eine Bildung beobach- 

 tet, die ich als einen kontractilen 

 Faden, ein Myonem gedeutet. (Taf. 

 fig. 3, m.y Wallengren]. 



9. None described. 



10. Stout oral membranellae, in- 

 clined to split up into fibrils of un- 

 equal length. 



11. Oral band of daughter animal 

 formed by gradual increase in length 

 and union of the cilia of ciliary field, 

 from without inward. 



12. Oral band begins on the side 

 of the neck. 



13. A " Peristomalrinne" present. 



14. None described. 



15. Ciliary field before differenti- 

 ation, having a band extending to- 

 ward the attachment disc. 



16. Oral end of new peristomal 

 band strongly inrolled. 



L. macfarlandi. 



1. Entoparasitic. 



2. Easily detached, and swim- 

 ming rapidly, with definite well co- 

 ordinated movements. 



3. Attachment disk bordered by 

 four rows of cilia forming four stri- 

 ated membranes. 



4. Ciliary membranes do not so 

 lose coordination. 



5. No " Haftring". 



6. Ventral side of the attachment 

 disc smooth and even. 



7. Long diameter of mouth-open- 

 ing forming an angle of from 45° to 

 80° with the long axis of the body. 



8. Strong contractile axial fibre 

 sending branches to the attachment 

 cup, and to the oral band. 



9. Vibratile neck membrane and 

 its fibre. 



10. Long fine oral cilia of equal 

 length, arising from transverse basal 

 bands. 



11. Oral band of daughter animal 

 formed by lengthening of the outer 

 cilia of the ciliary field, and union of 

 their basal bodies to form basal 

 bands, while the cilia of the center 

 of the field degenerate. 



12. Oral band begins just above 

 or over the extreme end of the 

 pharynx. 



13. No "Peristomalrinne" pres- 

 ent. 



14. A longitudinal furrow extend- 

 ing from the margin of the attach- 

 ment disc to the mouth. 



15. Ciliary field oval, with no such 

 band. 



16. Oral end of new peristomal 

 band not so inrolled. 



