Philodmaea] TH E INFUSORIA. 395 



species red eyes are present, and beneath these organs only 

 is nervous matter apparent. 



The genera are disposed as follow: 



f proboscis and foot processes present Callidina. 



Eyes absent. no proboscis or I rotatory organ pedicled Hydrias. 



^ horn-like processes | rotatory organ not pedic i ed Typhlina. 



ffoot having horn-like / tO6S tW ' ' ' R tifer ' 



Eyes present. 



two frontal es three .. Actinu,u, 



foot without horn-like processes, 1 



L toes two JMonoiabis, 



two cervical . . . . Philodina. 



Genus CLXXVIII. CALLTDINA. The beautiful Rota- 

 torial Animalcule is characterized by wanting visual organs, 

 and by possessing a proboscis, and a foot, furnished with 

 processes resembling horns. The vibratile, or rotatory 

 organ, is double, but not pedicled ; anteriorly is a thickly- 

 ciliated proboscis. The furcated foot has two elongated 

 toes, four little horns or processes, and six points. Two 

 muscles for moving the foot are also visible. The osso- 

 phagal head has two jaws, with numerous delicate teeth. 

 The filiform alimentary canal has a bladder-like expan- 

 sion posteriorly, but is not provided with glands; it is 

 surrounded by a granular and cellular mass, whose func- 

 tion is unknown : Ehrenberg thinks it is connected with 

 reproduction ; an ovarium, with single large ova, is seen ; a 

 little spur-like process, projecting from the neck, may be 

 a respiratory tube; no indication of a nervous system is 

 observable. 



688. CALLIDINA elegans. The graceful Callidina. 

 Body spindle-shaped, crystalline; rotatory organs, or 

 wheels, small. Figs. 470 to 472 represent this animalcule 



