THE WHEEL ANIMALCULES (ROTATORIA) 589 



10 (n) Eye in neck region Proales Gosse. 



Small, slow-moving, soft-bodied species, with partly ventral corona. Many species. 



Representative species(Fig. 856, page 555). Proales werneckii Ehrenberg. 

 (Fig. 858, page 557). . . . P. sordida Gosse. 

 (Fig. 859, page 558). ... P. tigrida Gosse. 



11 (10) Eye near front Furcularia Ehrenberg. 



Cuticula a little stiffer, so that the form is retained; shape at times a little prismatic; toes 

 longer aad stiffer than in Proales; active. Species numerous. 



Representative species (Fig. 870). . Furcularia forficula Ehrenberg. 

 (Fig. 871). . . . . . F. longiseta Ehrenberg. 



12 (9, 15) With two eyes 13 



13 (14) Eyes near front Diglena Ehrenberg. 



Strong predacious species with forcipate jaws; toes usually large. One or two species. 



Representative species (Fig. 872). . Diglena rostrata Dixon-Nuttall. 

 (Fig. 860, B, page 559). . D.forcipata Ehrenberg. 



14 (13) Eyes in neck Distemma Ehrenberg. 



Representative species (Fig. 873). . Distemma setigerum Ehrenberg. 



15 (9, 12) With three eyes in a transverse row. . Triophthalmus Ehrenberg. 



One species only (Fig. 874) Triophthalmus dorsualis, 



16 (8) Without eyes 17 



17(18) Internal parasites Albertia Dujardin. 



Few species. 



Representative species (Fig. 875) Albertia intrusor Gosse. 



18 (17) Free, or external parasites Pleurotrocha Ehrenberg. 



Few species. 



Representative species (Fig. 876) . . . Pleurotrocha grandis Western. 



19 (7) With auricles 20 



N.B. Auricles invisible when contracted. 



20 (25) With one eye . . 21 



21 (24) Smaller, soft-bodied forms 22 



22 (23) Cuticula with many transverse folds Taphrocampa Gosse. 



Representative species (Fig. 877). . Taphrocampa annulosa Gosse. 



