Hydatinaea.'] THE INFUSORIA. 377 



Genus CLXIV. Otoglena. The pedicle-eyed Rota- 

 tory Animalcule is characterized by having three eyes^ 

 one being sessile and cervical, the others pedicled and 

 frontal ; it possesses a furcated foot. This large animal- 

 cule has considerable resemblance to Notommata myrmeleo 

 or clavulata, but is very distinct. As regards the detail of 

 its organization, it may be stated that four lateral longi- 

 tudinal muscles, six vibratile muscles, and two muscles of 

 the foot, are present ; a toothless, and apparently jawless, 

 oesophagal canal, leads to a somewhat thickened stomach, 

 having a very thin posterior alimentary canal. Ova- 

 rium, contractile vesicles, and two sexual glands exist. 

 In the middle of the back appears to be a respiratory open- 

 ing; this, with a vascular network at the neck, and four 

 transverse 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 ganglion in the brow, and a forked ventral 

 nerve ( ?), together with two little horn-like or auricular 

 frontal protuberances, bearing two visual points, represent 

 the sensitive system. This genus has not been figured. 



647. Otoglena papillosa. The warty Otoglena. — 

 Body bell-shaped, turgid, scabrous through papillae. 

 Found with Volvox globator and Notommata myrmeleo. 

 Length l-96th. 



Genus CLXV. Cycloglena. The ring-eyed Rotatoria 

 have numerous eyes (more than three), simply conglomerate 

 at the neck, and the foot furcated. The vibratile organ is 

 compound; this organ, with the internal muscles of the 

 foot, compose the locomotive structure. They have an 

 oesophagal head, with two single-toothed (perhaps three- 



