372 DESCRIPTION OF {Rotatoria. 



anteriorly ; toes decurved, and longer than the stout foot. 

 Length 1-1 10th. 



631. DiGLENA (?) aurita ( Vorlicella caniciila, M.) The 

 long-eared Diglena. — Body cylindrical, slender; front 

 straightly truncated, auricled ; foot suddenly constricted, 

 toes small. The tremulous organ (heart) observed by 

 Corti was merely the vibratile lining membrane of the 

 anterior portion of the alimentary canal. Found amongst 

 conferva. Length 1-1 60th. 



632. Diglena catellina {Cercaria catellina, Vorticella 

 larva, M.) The little dog Diglena. — Body oblong, short, 

 ends truncated ; foot short, and inferior. The small size 

 of this animalcule is unfavourable for observing its internal 

 organization. It is found at all seasons of the year in 

 open water and infusions, covered with a green pellicle, 

 which is often filled with its eggs ; these, when rapidly 

 developed by genial weather, cause a milky turbidity in 

 the water. Length l-360th. 



633. Diglena conura. The long-cone Diglena. — Body 

 ovato-oblong, straightly truncated in front, and gradually 

 attenuated to a conical foot. Found amongst oscillatoria. 

 Length 1-1 44th. 



634. Diglena capitata. The great-headed Diglena. — 

 Body oblong, conical, obliquely truncated, and dilated in 

 front ; toes long, without apparent base, or foot. This 

 animalcule feeds upon Chlamidomonas and Naviculae. 

 Length 1 -300th. 



635. Diglena caudata {Vorticella f areata, M.,) The 

 long-tailed Diglena. — Body elongated, conical, obliquely 

 truncated anteriorly, but not dilated ; foot distinct, short ; 

 toes long. Found in green water. Length 1 -200th. 



