THE WHEEL ANIMALCULES (ROTATORIA) 613 



115 (112) Without lorica. With spine-like or limb-like appendages. No 

 foot Family PEDALIONIDAE . . 116 



116(117,118,119) Appendages, two, very long Pedetes Gosse. 



Representative species (Fig. 943). . . .- . . Pedetes saltator Gosse. 



117 (116, ii 8, 119) Appendages, three, spine-like. . Triarthra Ehrenberg. 



Two or three species. 



Representative species (Fig. 944, A). . Triarthra longiseta Ehrenberg. 

 (Fig. 944,5) T. brachiata Rousselet. 



118 (116, 117, 119) Appendages, four; spines or bristles. 



Tetramastix Zacharias. 



One species only (Fig. 945). . . Tetramastix opoliensis Zacharias. 



119 (116, 117, 118) Appendages, six, branching, somewhat crustacean-like. 



Pedalion Hudson. 



Two species. 



Representative species (Fig. 946). . . . Pedalion mirum Hudson. 



120(111) Body spherical, no foot Family TROCHOSPHAERTDAE. 



One genus only Trochosphaera Semper. 



Representative species (Fig. 947). . Trochosphaera solstitialis Thorpe. 



