202 CLASS VI. 
Euchlanis EHRENB. (spec. of Cercaria MUELL.) 
Sp. Luchl. luna, Cercaria luna Mueut., Furcocerca luna Lam., MumEut, 
Infusor. Tab. XX. figs. 8, 9; Enrens. Infusionsth. Tab. LXII. figs. 10, &c. 
Dinocharis EHRENB. 
Salpina KHRENB. 
Colurus EHRENB. 
Monura EHRENB. 
Rattulus Lam. (Mastigocerca and Monocerca KHRENB.) 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., Trichoda rattus MvuELL., ErcoHorn Wasser- 
thiere, Tab. 11. fig. 0, die Wasserratte Murut., Infusor. Tab. Xx1x. figs. 
5—7. (EHRENBERG distinguishes here two species and two genera: 
Mastigocerca carinata Mount. 1. 1. fig. 7, Infusionsthier. Tab. uvit. fig. 7, 
which has a shell, and Monocerca rattus, Tab. xuvitt. fig. 7, to which 
E1cHHorn’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 ; DusARDIN 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, Trichoda lunaris Muruu., Infus. Tab. XxXIx, figs. 1—3, 
EHRRENB. Jnfusionsth. Tab. LVI. fig. 1. 
Polyarthra EHRENB. @ 
Triarthra EMRENB. 
Sp: Triarthra longiseta Eurena., EichHorn Wasserthiere, Tab. 1. fig. 7, 
EHRENB., Organisat. in d. Richt. des kl. Raumes, 3tter Beitrag, Tab. VII. 
fig. 1, Infusionsth. Tab. Lv. figs. 7, &e. 
Family IV. Hydatinea (Furcularina Dusarp.) Animals swim- 
ming freely, naked, with integument contractile, flexible, often 
marked by parallel rugee. ‘T'ail forked. 
A. Rotatory organ single, continuous, not lobed at the margin. 
(Ichthydina KHRENB. in part). 
Ichthydium Exrens. (species of Cercarta Mur.) Body 
smooth. 
Sp. Ichthyd. podura EuRENB., Infusionsth. Tab. XLIu. fig. 2. 
Chetonotus EHRENB. (species of Zrtchoda MUELL.) Body 
hairy. 
Sp. Chetonotus larus, Trichoda larus MUELL., Infusor. Tab. 31, figs. 5—7; 
Eurens. Infusionsth. Tab. Xuiit. figs. 4, &e. 
