130 



DESCRIPTION OF PLATE IX. 



THE STEPHANOCEROS, OR CROWNED 

 WHEEL-ANIMALCULE. 



( PAGE 63. ) 



Two individuals of the Stephanoceros, (Stephanoceros Ehrenberffi), 

 are here represented attached to the stem of an aquatic plant. 



FIG. 1. The animalcule fully protruded from its transparent sheath. 

 The rotatory organs, composed of five long tentacula fur- 

 nished with rows of short verticillate cilia, are extended in 

 the form of an elongated dome, the extremities meeting in 

 the centre. 



a, Small oval bodies, supposed to be nervous centres, (ganglia} ' 



to supply the tentacula, p. 66. 



b, The trembling organs, p. 66. 



c, The jaws and teeth, p. 67. 



d, The stomach. 



e, The transparent case. 



FIG. 2. The animal shrunk down towards the bottom of the case. The 

 upper part of the arms, pressed together in an obtuse elon- 

 gated cone, alone appears above the margin of the sheath, 

 p. 65. 



