646 DESCHIPTION OF iRoiatoriii. 



TRiornTnALMUS dorsaUs. — Body ciystallino, turgid ; foot suddenly 

 attenuated, its length half that of the body. This species, in form, 

 resembles Kotommata ansata, but in size N. myrmeUo. Fig 412 

 represents (dorsal side) an animalcule extended as it appears when 

 swimming and vibrating ; fig 413, one in the act of unfolding itself • 

 and fig. 414, another contracted. Length l-40th. 



Genus Eosphoka. The three-eyed Rotatoria. — Eyes three, sessile, 

 two frontal, one cervical, foot forked. The rotatory organ is com- 

 posed of numerous muscular portions, and distinctly striated longi- 

 tudinal muscles are seen in all. An cesoj)hageal head, provided with 

 two single toothed jaws, a short oesophagus, a simple conical 

 alimentary canal, with two ovate glands anteriorly, an ovarium, 

 somewhat extended, sexual glands, and a contractile vesicle, are also 

 discoverable. Transverse vessels are observable in two species, and 

 in the third, gills. No respiratoiy tube has been discovered. Beside 

 the three red coloured eyes, a cerebral ganglion is seen. 



E. najas. — Body conical, transparent, not aixricled ; toes much 

 shorter than the foot. Fig. 415 represents an animalcule fed upon 

 indigo. Found amongst Conferva. Length 1-1 2th 



E. digitnta. — Body conical, hyaline, not auricled ; toes a thuxl the 

 length of the foot. Found amongst Conferva. Length 1 -96th. 



E. ehnyata. — Body elongated, almost fusiform, not aiuicled, front 

 truncated; toes short. Length 1- 72nd. 



Genus Otoglena. The fedicle-eyed Rotatory Animalcules. — Eyes 

 three, one being sessile and cervical, the others pedicled and fi-ontal ; 

 foot furcated. This large animalcule has considerable resemblance 

 to Notommata myrmeleo, or N. claviilata. Four lateral longitudinal 

 muscles, six moving the rotary organ, and two muscles of the foot, 

 arc present ; a toothless, and apparently jawless, oesophageal canal, 

 leads to a somewhat thickened stomach, ending in a very thin ali- 

 mentary canal. Ovaiium, contractile vesicles, and two sexual 

 glands, exist. In the middle of the back appears to be a respiratory 

 opening ; this, with a vascular net- work at the neck, and four trans- 

 verse circular canals, represent a vascular system. An oval cerebral 

 ganglion, with two dark appendages, a red eye, a long nervous 

 loop on the neck, that runs back to a second gangUon in the brow, 



