OF ANTMALCULES. 171 



at figure 254, in the act of whirling, as indicated by the 

 four currents. It has two rotatory organs 5 hence it be- 

 longs to the family Zygotrocha, like the preceding, with 

 which it is usually confounded* : they differ mainly in 

 the position of the eyes, which, in the instance before 

 us, are situated below the sexual organs, while in the 

 F. rotatoria, figure 255, they are near the end of the pro- 

 boscis. Dr. E. found several species of this new genus 

 in the vicinity of Berlin, among the confervae in their 

 Zoological gardens. 



The drawing, figure 254, represents the animalcule 

 while lying on its back ; it shews the mouth aperture at 

 the centre of the currents -, the wheels, eyes, manduca- 

 tory organs, and the ova, very distinct ; and a part also 

 of the narrow alimentary canal, which is represented of 

 a darker colour, as filled with opaque food : the cloaca 

 also is seen near its termination. 



Figure 256 is part of a group of eggs ; in one of which 

 the bulbous oesophagus of the embryo is visible ; in the 

 other the produce has just emerged from the shell, and is 

 half the size of the parent, which is about l-90th of an 

 inch long. 



398. VoRTicELLA uajas {Eosphora, E.) — The three- 

 eyed crystal Vorticella, represented at figure 257, under 

 ordinary instruments is only distinguishable from the 

 V. senta by the body of the former being more cylindri- 

 cal. When viewed under a superior instrument, with 



• See " Microscopic Cabinet," Plate 5. 



