ROTATORIA. 201 
cularis DuTrocurT Ann. du Mus. Vol. x1x. Pl. 18, figs. 1—8; EHRENB. 
Infusionsth. Tab. xvi. fig. 3. These animalcules seated in a case that 
adheres to duck-weed, belong to the forms which were first discovered by 
LEEUWENHOECK. 
Limnias Scurank, Enrens, Body clavate, with rotatory 
organ bilobed, and respiratory tubule none, solitary, retractile into 
an opaque envelope. Ocelli two. 
Sp. Limnias ceratophylli, Exrens. Infusionsth. Tab. Xvi. fig. 4. 
Family II. Brachionea. Animals swimming freely, covered 
with a membraneous scute univalve or bivalve, furnished with rota- 
tory organ double or multiple (zygotrocha or polytrocha EHRENB.) 
Pierodina Euruns. Shield orbicular or oblong. Rotatory 
organ double. Two ocelliform points. Tail cylindrical, transversely 
rugose, terminated by a suctorial dise which is often ciliated. 
Sp. Pterodina patina ExRENB., Brachionus patina MuEtt., Infusor. Tab. 48, 
figs. 6—10, EHRENB. Infusionsth. Tab. ux1v. figs. 4, &e. 
Brachionus Hitt, Muett. (in part). Scute urceolar, open in 
front and behind, with anterior aperture or both denticulate. Rota- 
tory organs two. Maxille digitate. 
I. Tail articulate, forked at the point. 
a) With ocelliform point above the maxille. (Genus Brachionus 
EHRENB,) 
Sp. Brachionus urceolaris Muntt., Infusor. Tab. u. figs. 15 —21. EHRENB. 
Orgamis. in d. Richt. des kl. Raumes, 3tter Beitrag, Tab. 1x. fig. 111., 
Infusionsth. Tab. txt. figs. 3, &e. 
6) Without ocelliform point. (Genus Noteus ERRENB.) 
Sp. Noteus quadricornis EHRENB., Infusionsth. Tab. LX. fig. II. 
II. Tail none. (Genus Anurwa EHRENB.)  ~- 
Sp. Brachionus squamula Murun., Anurea squamula EHRENB., MusE.n. 
Infusor. Tab. 47, figs. 4—7, &e. 
Lepadella Bory (spec. of Brachionus Murtt.) Scute oval, 
convex above, flattish beneath, open at both ends. Rotatory organ 
divided into several lobes. Tail triarticulate, forked at the extre- 
mity. Maxille naked, terminated by a single point, or by two or 
three teeth. 
Genera : Lepadella, Metopidia, Stephanops, and Squamella Enrens. 
Sp. Lepadella (Stephanops EHRENB.) lamellaris, Brachionus lamellaris MUELL., 
Infus. Tab. 47, figs. 8—11 ; Enrens. Infusionsth. Tab. urx. figs. 13, &e. 
