52 CLASS I. 



Family VII. Astasice. Body not loricated, caudate or ecaudate, 

 form mutable. 



Astasia EHRENB. Animal free, caudate, without an eye-point. 



Sp. See figures in EHRENBEBG'S Infusionsth. Tab. vn. fig. i.-iv. DUJAEDIN 

 In/us. Tab. v. fig. 12. 



Euglena EHRENB. (and Amblyophis ejusd.) Animal free, with 

 an eye-point. 



* Body ecaudate. 

 Amblyophis EHRENB. 



** Body caudate. 



Sp. Euglena viridis, Cercaria viridis MUELL. Infos. Tab. Xix. fig. 6-13; 

 EHRENB. Infusionsth. Tab. vn. fig. ix ; DUJARD. Infus. PI. v. fig. 9, 10. 



This species also belongs to PRIESTLEY'S green matter ; another species can 

 occasionally by its red colour give to water a blood-red appearance. 



Family VIII. Periphrygana (Enchelia EHRENB. in part). Body 

 orbicular, surrounded with setaceous tentacles, without vibratile 

 cilia. 



EHRENBERG ascribes an oral aperture to Actinophrys, which Du- 

 JARDIN could not perceive. There are no cilia, but there are appen- 

 dages or cirrhi. 



Actinophrys EHRENB., Peritricha BORY. Body rough with 

 tentacles radiating in all directions. 



Sp. Actinophrys sol EHRENB., Trichoda sol MUELL. Infus. Tab. xxin. fig. 

 43-45, EHRENB. Infusionsth. Tab. xxxi. fig. vi. DUJARD. Infus. Tab. in. 

 fig. 3. in fresh water. 



Subgenus Podophrya EHRENB. Body with a transparent appen- 

 dage resembling a pedicle. 



Sp. Podophrya cometa, Trichoda fixa MUELL. l 



Trichodiscus EHRENB. Body radiating with tentacles at the margin 

 only. 



f 1 The pedicle of Podophrya is very variable in length. In some of the forms it 

 almost disappears, so as to render it difficult to determine whether an actinophrys or 

 podophrya be under examination. STEIN thinks there is no specific difference between 

 the two, certainly no generic. From his observations it appears, indeed, that both 

 Actinophrys and Podophrya are Acinetce forms derived from encysted Vorticella micro- 

 stoma. Die Infusionsthiere, p. 138, &c.] 



