17. Without a foot, but often wth a rear projection of the lorica 18. 

 With a foot 20. 



18. Lorica outcurved all around 



Chromogaster Lautenborn 

 {Anapus Bergendal) 

 Lorica flattened on one side 19. 



19. Lorica with lengthwise ridges or furrows 



Klotholca Gosse 

 Lorica irregularly marked 

 Keratella Bory 

 (Anuraea Ehrenberg) 



20. Foot ending in a ring of cilia 



Testudinella Bory 

 (Pterodina Ehrenberg) 

 Foot not so, being forked or ending in one or two toes 21. 



21. Foot deeply forked, each fork bearing two short toes 



Schizocerca Daday 

 Foot with one or two toes 22. 



22. Foot with many short rings, very retractile 23. 

 Foot with a very few wide segments, not much retractile 25. 



23. Foot projecting from the rear of the body 



Brachionus Pallas 

 Foot projecting from the rear of the ventral side 24. 



24. Lorica wrinkled 



Ploesoma Herrick 

 Lorica smooth 



Gastropus Imhof. 



25. Foot ending in one toe or in one long toe and one very short toe 26. 

 Foot ending in two equal toes or in one long toe and one shorter toe 



which is about one-half or more the length of the long toe 27. 



26. Lorica divided into lengthwise plates; with one toe 



Monostyla Ehrenberg 

 Lorica almost plain; with one long toe and one very short, scarcely notice' 

 able toe 



Trichocerca Lamarck 

 {Rattulus Lamarck) 



27. Lorica in one almost cylindrical piece 28. 

 Lorica composed of two to four lengthwise plates, often flattened 32. 



28. Dorsal surface of lorica with long spines 



Macrochaetus Perty 

 (Polychaetus Perty) 

 No spines on dorsal surface of lorica 29. 



29. With a flat, chitinous plate above the head 



Squatinella Bory 

 (Stephanops Ehrenberg) 

 No plate above the head 30. 



68 



