202 CLASS VI. 



Euchlanis EHRENB. (spec, of Gercaria MUELL,) 



Sp. Euchl. luna, Cercaria luna MUELL., Furcocerca luna LAM., MUELL. 

 Infusor. Tab. xx. figs. 8, 9 ; EHRENB. Infusionsth. Tab. LXII. figs. 10, c. 



Dinocharis EHRENB. 



Salpina EHRENB. 



Colurus EHRENB. 



Monura EHRENB. 



Rattulus LAM. (Mastigocerca and Monocerca EHRENB.) Body 

 oval, covered with a scute carinate, narrowed posteriorly. Rotatory 

 organ divided into several lobes. Tail styliform, long, rigid. 

 Ocelliform point single. 



Sp. Rattulus carinatus LAM., Trickoda rattus MUELL., EICHHORN Wasser- 

 thiere, Tab. n. fig. o, die Wasserratte MUELL., Infusor. Tab. xxix. figs. 

 5 7. (EHRENBERG distinguishes here two species and two genera: 

 Mastigocerca carinata MUELL. 1. 1. fig. 7, Infusionsthier. Tab. LVII. fig. 7, 

 which has a shell, and Monocerca rattus, Tab. XLVIII. fig. 7, to which 

 EICHHORN'S drawing and the first two figures of MUELLER 1. 1. belong, 

 which wants the shell, whilst he however remarks, that both are very 

 similar ; DUJARDIN is of opinion that only one species should be adopted.) 



Rattulus EHRENB. With two ocelliform points, and tail styli- 

 form, inflected. (Animal naked? Is this its place ?) 



Sp. Rattulus lunaris, Trickoda lunaris MUELL., Infus. Tab. xxix. figs. 13, 

 EHRENB. Infusionsth. Tab. LVI. fig. r. 



Polyarthra EHRENB. 

 Triarthra EHRENB. 



Sp. Triarthra longiseta EHRENB., EICHHORN Wasserthiere, Tab. i. fig. 7, 

 EHRENB., Organisat. in d. Richt. des kl. Raumes, $tter Beitray, Tab. vin. 

 fig. i, Infusionsth. Tab. LV. figs. 7, &c. 



Family IV. Hydatincea (Furcularina DUJARD.) Animals swim- 

 ming freely, naked, with integument contractile, flexible, often 

 marked by parallel rugae. Tail forked. 



A. Rotatory organ single, continuous, not lobed at the margin. 

 (Ichthydina EHRENB. in part). 



Ichthydium EHRENB. (species of Cercaria MUELL.) Body 

 smooth. 



Sp. Ichthyd. podura EHRENB., Infusionsth. Tab. XLIII. fig. i. 



Chcetonotus EHRENB. (species of Trickoda MUELL.) Body 



hairy. 



Sp. Chcetonotus larus, Trichoda larus MUELL., Infmor. Tab. 31, figs. 5 7; 

 EHRENB. Infusionsth. Tab. XLIII. figs. 4, &c. 



