376 DESCRIPTION OF [Rotatoria. 



643. TRIOPTHALMUS dorsualis. Body crystalline, tur- 

 gid; foot suddenly attenuated, its length half the body. This 

 species, in form, resembles Notommata ansata, but in size 

 N. myrmeleo. Fig. 412 represents (dorsal side) an animal- 

 cule extended as it appears when swimming and vibrating; 



Jig. 413, another in the act of unfolding itself ; and^g. 414, 

 another specimen, contracted. Length l-40th. 



Genus CLXIII. EOSPHORA. The three-eyed Rotatoria 

 have three sessile eyes, two frontal, the one cervical, and 

 possess a forked foot. The rotatory organ is composed of 

 numerous muscular portions, and distinctly-striated longi- 

 tudinal muscles are seen in all. An O3sophagal head, pro- 

 vided 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 to be found. Transverse 

 vessels are observable in two species, in the third gills. 

 No respiratory tube has been discovered. Beside the 

 three red coloured eyes a cerebral ganglion is seen. 



644. EOSPHORA najas. The aurora Eosphora. Body 

 conical, transparent, not auricled ; toes much shorter than 

 the foot. The name Aurora is derived from the red colour 

 of the eye. Fig. 415 represents an animalcule fed upon 

 indigo. Found amongst conferva. Length 1-1 20th. 



645. EOSPHORA digitata. The long-Jwgered Eosphora. 

 Body conical, hyaline, not auricled ; toes a third the 

 length of the foot. Found amongst conferva. Length 

 l-96th. 



646. EOSPHORA elongata. The slender Eosphora. 

 Body elongated, almost fusiform, not auricled, front trun- 

 cated ; toes short. Length 1 -72nd. 



