Ilydatinaea.'] infusoetal animalcules. ■GiT 



and ;i forked ventral nerve (r), together witli two little liorn-likc 

 or auricular frontal protiiberances, bearing two visual points, re- 

 present the sensitive system. This genus has not been figured. 



Otoglexa paj'iUosa. — Body bell- shaped, turgid, scabrous with 

 papillnc. Found with VoJvox glohator and Notommata myrmdeo. 

 Length l-OGth. 



Gcniis CvcLOGENA. The ring-eyed Rotatoria. — Eyes niuncrous, 

 (more than three), simply conglomerate at the neck, foot furcate. 

 The vibratilc organ is compound ; and with the internal muscles of 

 the foot, serve for locomotion. There is an o3sophageal head, 

 with two single-toothed (perhaps three-toothed) jaws, a very short 

 CDsophagus, and a simple conical alimentary canal, with two round- 

 ish glands. An ovarium, two sexual glands, and a contractile 

 vesicle are also present. Transverse circular vessels, and six pair 

 of tremulous organs attached to the seminal glands, constitute the 

 vascular system. A pui'se-shaped dark (colourless) body in the 

 neck, connected by a narrow process to a large frontal ganglion, 

 containing fi'om six to twelve red points, of which the anterior 

 one is most marked, indicate a sensitive system. 



C. hqms {Ccrcaria lupus. M.) — Body ovato-oblong, or conical, 

 not auricled ; foot terminal, and short. Plate 10, fig. 425,"* re- 

 presents a back view, and fig. 426 a side view. Length 1 -120th. 



C. (?) elegans. — Body ovate, not aimclcd ; foot inferior ; toes 

 long. Length 1-1 90th. 



Genus Theokus. The many-eyed Ilydatinaea. — Eyes numerous, 

 (more than three), disposed in two groups at the neck ; foot furcate. 

 A compound rotary organ, together ^vith two muscles of the foot, an 

 oesophageal head, with two one-toothed jaws, a short oesophagus, a 

 simple conical alimentary canal, with two glands, a ball-like ovarium, 

 with two male sexual glands, and a double group of colourless 

 cer\ical eyes, are the details of the organization at present known. 

 The frontal uncinus, or hook, is perhaps a respiratory tube. 



T. vernalis. — Toes small ; no frontal uncinus. The movement of 

 this creature is active and vehement, like that of an animal of 

 prey. Eig. 427 represents a back view of this animalcule extended, 

 with six coloui-lcss eyes in each group ; fig. 428 is another specimen 



