ROTATORIA. 205 
Lindia DusARD.? 
Note.-—Genus Albertia Dusarp. is distinguished by a shield in 
front of the rotatory organ and by a tail which is conical, short, un- 
divided. Body cylindrical, elongate. It lives parasitically, in the 
intestinal tube of earth-worms and slugs. Comp. Ann. des Se. nat. 
2e serie, Tom. x. p. 175, Tab. 11. 
Family V.  Philodinea Enrens. (Rotifera Dusarp.) Animals 
swimming freely or creeping (after the manner of geometric cater- 
pillars). Body elongate, fusiform, contractile into a ball. Rotatory 
organ double. Tail articulate, furnished posteriorly with little 
horns or styles. The stapediform maxille with two parallel teeth, 
sometimes with three. 
Rotifer Cuv.! (The characters of the family.) 
a) Without proboscis. 
Typhlina Exrens. (and Hydrias ejusd. Ocelliform points none). 
Monolabis Exrens. Ocelliform points two. 
b) Anterior process retractile, proboscidean. 
*) Ocelliform points none. 
Calladina EXRENB. 
**)  Ocelliform points two. 
Philodina. The ocelliform points situated behind the proboscis. 
Sp. Philodina erythrophthalma ExRENB., Organisation, Systematik, &c. 
Berlin, 1830, Tab. vil. fig. 2; Infusionsth. Tab. LXx1. fig. 4; by former 
writers confounded with Rotifer vulgaris. DUJARDIN names this species, 
with which he thinks some other species of Philodina EHRENB. ought to 
be united, Rotifer inflatus, Infusoires, Pl. 17, fig. 2. 
Rotifer EnrEns. (and Actinurus ejusd.). Ocelliform points situated 
at the anterior part of the proboscis. 
Sp. Rotifer vulgaris SCHRANK, EHRENB., Furcularia rediviva LaM., Vorticella 
rotatoria Muruu., Infusor. Tab. xuit. figs. r1r—16; EnRENB. Organisat., 
Systematik, &c. 1830. Tab. vu. fig. 1, Infusionsth. Tab. Lx. fig. 4; Dusar- 
DIN, Infusoires, Pl. 17, fig. 1. 
This Wheel-animalcule was first discribed and figured by LEEUWENHOECK 
in 1702. (Sevende vervoly der Brieven, 144 ste Missive, bl. 406). He observed 
1 Tableau élémentaire, 1798, p. 653. 
