KOTATORIA. 201 



cularis DUTROCHET Ann. du Mus. Vol. xix. PI. 18, figs, i 8; EHRENB. 

 Infusionsth. Tab. XLVI. fig. 3. These animalcules seated in a case that 

 adheres to duck-weed, belong to the forms which were first discovered by 

 LEEUWENHOECK. 



Limnias ScHRANK, EHRENB. Body clavate, with rotatory 

 organ bilobed, and respiratory tubule none, solitary, retractile into 

 an opaque envelope. Ocelli two. 



Sp. Limnias ceratophylli, EHRENB. Infusionsth. Tab. XLVI. fig. 4. 



Family III. Brachioncea. Animals swimming freely, covered 

 with a membraneous scute univalve or bivalve, furnished with rota- 

 tory organ double or multiple (zygotrocha or polytrocha EHRENB.) 



Pterodina EHRENB. Shield orbicular or oblong. Eotatory 

 organ double. Two ocelliform points. Tail cylindrical, transversely 

 rugose, terminated by a suctorial disc which is often ciliated. 



Sp. Pterodina patina EHRENB., Brachionus patina MUELL., Infusor. Tab. 48, 

 figs. 6 10, EHRENB. Infusionsth. Tab. LXIV. figs. 4, &c. 



BracJiionus HILL, MUELL. (in part). Scute urceolar, open in 

 front and behind, with anterior aperture or both denticulate. Rota- 

 tory organs two. Maxillse digitate. 



I. Tail articulate, forked at the point. 



a] With ocelliform point above the maxillae. (Genus Brachionus 

 EHRENB.) 



Sp. Brachionus urceolaris MUELL., Infusor. Tab. L. figs. 15 21. EHRENB. 

 Organis. in d. Richt. des Id. Raumes, $tter Beitrag, Tab. ix. fig. in., 

 Infusionsth. Tab. LXIII. figs. 3, &c. 



6) Without ocelliform. point. (Genus Noteus EHRENB.) 

 Sp. Noteus quadricornis EHRENB., Infusionsth. Tab. LXII. fig. II. 



II. Tail none. (Genus Anurcea EHRENB.) 



Sp. Brachionus squamula MUELL., Anurcea squamula EHRENB., MUELL. 

 Infusor. Tab. 47, figs. 4 7, &c. 



Lepadella BORY (spec, of BracJiionus MUELL.) Scute oval, 

 convex above, flattish beneath, open at both ends. Eotatory organ 

 divided into several lobes. Tail triarticulate, forked at the extre- 

 mity. Maxillae naked, terminated by a single point, or by two or 

 three teeth. 



Genera : Lepadella, Metopidia, Stephanops, and Squamella EHRENB. 



Sp. Lepadella (Stephanops EHRENB.) lamellaris, Brachionus lamellaris MUELL., 

 Infus. Tab. 47, figs. 8 11 ; EHRENB. Infusionsth. Tab. Lix. figs. 13, &c. 



