204 CLASS VI. 



Sp. Enteroplea Jiydatina KHRENB. Tab. XLVII. fig. i, DUJAKD. fnfusoires, 

 PI. xix. fig. 2. 



Hydatina EHRENB. Body oval, anteriorly truncate. Maxillte 

 digitate at the extremity, terminated by teeth five in number, free. 

 Ocelliform points none. 



Sp. Hydatina senta, Vorticella senta MUELL., Infusor. Tab. XLI. figs. 8 14 ; 

 EHRENB. Organisation, Systematic, &c. 1830, Tab. viu. Infusionsth. XLVII. 

 fig. i this is the animal in which EHRENBERG first demonstrated the com- 

 posite structure of the Rotatoria. 



Notommata EHRENB. (in part). Body oval or oblong, posteriorly 

 narrower, anteriorly truncate. Maxillae digitate, with several teeth 

 at the extremity. Ocelliform point single, forward, dorsal, or 

 several points clustered. 



Sp. Notommata clavulata EHRENB., Organisation in der Richtung d. kl. 

 Raumes, $tter Beitrag, Tab. x. fig. i, Infusionsthierchen, Tab. L. figs. 5, &c. 



Cycloglena lupus EHRENB., Infusionsth. Tab. xvi. fig. 10, (the form of 

 the maxillae not yet accurately known). 



Syncliceta EHRENB. Body broad anteriorly. Eotatory organ 

 armed with styles. Ocelliform point single, anterior, dorsal. 



Sp. Synchceta baltica EHRENB., Infusionsth. Tab. LIII. fig. 5 ; phosphorescent, 

 in the Baltic, &c. 



Furcularia LAM. (in part), DuJARD. Maxillae forcipate, with 

 extremity usually undivided and acuminate, or bidentate, protrac- 

 tile as far as the margin of the rotatory organ. 



a) Ocelliform point none. Pleurotrocha EHRENB. 



Sp. Pleurotrocha constricta EHRENB., Infusionsth. Tab. XLVIII. figs, i, &c. 



b) Ocelliform point single. Furcularia and Scaridium EHRENB. 



Sp. Furcularia gibba EHRENB., Infusionsth. Tab. XLVIII. figs. 3, &c. Furcul. 

 longicauda LAM., Trichoda longicauda MUELL., Infusor. Tab. xxxi. figs. 

 8 10, Scaridium longicaudum EHRENB., Infusionsth. Tab. LIV. fig. i, 

 with a hook in front on the wheel-organ and a very long tail, by which the 

 animal progresses in the water by leaps. 



c) Ocelliform points two (Diylena and Distemma EHRENB. exclusive of 

 Distemma marinum ejusd.) 



Sp. Furcularia forcipata, Cercaria forcipata and vermicular^ MUELL., Infu- 

 sor. Tab. xx. figs. 18 23 ; EHRENB. Infusionsth. Tab. LV. fig. i, Dekinia 

 vermicular is, MORREN Bijdragen tot de natuurk. Wetensch. v. pp. 227, &c. 



d) Ocelliform points three (Triophthalmus, Eosphora EHRENB.) 



e} Ocelliform points numerous, disposed in two clusters (Thcorns 

 EHRENB.) 



