30. Foot and toes short; toes sometimes unequal 



Diurella Bory 



(Coelopus Hudson and Gosse) 

 Foot and toes about as long as the body; toes equal 31. 



3 1 . Lorica almost smooth 



Scandium Ehrenberg 

 Lorica marked into irregular sections 

 Trichotna Bory 

 (Dmocharis Ehrenberg) 



32. With a chitinous plate above the head, which is arched in side view, ap' 



pearing like a sickle 33. 



No plate over head 34. 



33. Lorica higher than wide, of two side plates 



Colurella Bory 

 (Colurus Ehrenberg) 

 Lorica wider than high, of one dorsal and one ventral plate 

 Lepadella Bory 

 (Metopidia Ehrenberg) 



34. Lorica split down the back, of three or four plates 35. 

 Lorica composed of one dorsal and one ventral plate 36. 



35. Lorica small, covering only the upper part of the body 



Diaschiza Gosse 

 Lorica enclosing the body; usually, but not always, with spines projecting 

 forward 



My tilma Bory 

 (Dip lax Gosse) 

 (Salpma Ehrenberg) 



36. Foot with one segment 37. 

 Foot with three segments 38. 



37. Corona somewhat narrower than the body; toes usually longer than the 



rest of the foot 



Lecane Nitzsch 

 (Cathypyia Gosse) 

 (Distyla Eckstein) 

 Corona about as wide as the body; toes very short 

 Brachionus Pallas 



38. Body fat; corona almost as wide as the body 



Platyias Harring 

 (7\[oteus Ehrenberg) 

 Body lengthened; corona about half as wide as the widest section through 

 the body 



Euchlams Ehrenberg 



39. Body cylindrical, formed of ring-like segments which may be drawn up 



within one another; usually, but not always, with three toes; swim' 



ming or creeping; with or without a corona 40. 



Body not so; with or without a foot with one or two toes; swimming only; 



with a corona 44. 



69 



