410 DESCRIPTION OF [Rotaiaria. 



Anuraea, Brachionus, and Noteus. A nervous system is 

 indicated by the presence of red visual points in all, except 

 Noteus, M'hich, however, possesses a cerebral ganglion. 



Some of the Brachionaea are so numerous, as to render 

 the water milky and turbid. 



The genera are disposed as follow: — 



Eyes absent, with a furcated foot Noteus. 



no foot Anuraea. 



{ 



I one (ceivical) eye 

 Eyes present ( L foot furcated Brachionus. 



(_ two frontal eyes, foot Btyliform Pterodina. 



Genus CLXXXV. Noteus. The egg-carryitig Brachio- 

 naea are destitute of visual organs, but provided with a 

 furcated foot (Brachioni wanting eyes). The two- wheeled 

 vibratory organ has between its portions a three-lobed ciliated 

 brow, but has no long feeler bristles; it possesses, (as also the 

 furcate foot,) distinct muscles. The lorica has spines both 

 anteriorly and posteriorly ; an oesophagal head, with 

 jaws, having many teeth {polygomphia), a constricted ali- 

 mentary canal or stomach {gasterodela), with two large 

 glands ; an ovarium, two sexual glands, and a contractile 

 vesicle, are to be recognized. There is also a trace of tre- 

 mulous gills, a short and thick respiratory tube, and a large 

 central ganglion, lying between the muscles of the vibratory 

 organs. 



706. Noteus quadricornis. The four-horned Noteus 

 has a suborbicular lorica, depressed, rough (scabrous), and 

 urceolated ; it has anteriorly four horns, posteriorly two 

 spines. This animalcule is large, very transparent, and of 

 a whitish colour. Figs. 491 to 493 represent dorsal, 

 ventral, and side views; and Jig. 494 the jaws separate, and 



