ROTIFERA 



233 



F. omata Ehrenberg. Lobes 5, each with a round knob which bears 

 the cilia; foot about twice as long as the body; no eyes; length .5 

 mm.: common and sessile; among water plants. 



F. campanulata Dobie (Fig. 368). 

 Lobes 5, distinct and not knobbed ; cilia 

 non-vibratile on entire margin of the 

 bell-shaped corona; sessile; length .6 

 mm. : often common. 



F. pelagica Rousselet. Corona cir- 

 cular, but slightly lobed with short, 

 non-vibratile cilia; free-swimming. 



2. Stephanoceeos Ehrenberg. 

 Lobes 5, very long, slender, and point- 

 ed, the cilia on them being non-vibra- 

 tile and in rows or whorls; tube trans- 

 parent; foot very long: 1 species. 

 S. fimbriatus (Goldfuss) {S. eichhornii Ehr.) (Fig. 369). 

 1.5 mm.: on aquatic plants; not common. 



Fig. 368 



Floscularia 



campanulata 



(Montgomery). 



Fig. 369 

 Stephanoceros 



fimbriatus 

 (Montgomery). 



Length 



Family 2. MELICIEETIDAE. 



Colonial or not; usually tubicolous; corona 2 or 4-lobed with a 

 continuous row of large marginal cilia; 1 to 3 antennae, 1 dorsal and 2 

 ventral: 10 genera. 



Key to the genera of Melicertidae here described: 



Oi Non-colonial rotifers. 

 &i Corona distinctly 2 or 4-lobed. 



Ci Corona 4-lobed 1. Melicerta 



Cj Corona 2-lobed 2. Limnias 



bz Corona oval or nearly circular and indistinctly 2-lobed. 



^ , . , ..- 3. CECISTES 



O2 Colonial rotifers. 



61 Colonies sessile, tubicolous or not. 



Ci Not tubicolous 4. Megalotrocha 



C2 Animals in transparent tubes 5. Lacinulaeia 



62 Colonies free-swimming, animals tubicolous . 6. Conochilus 



1. Melicerta Schrank. Corona large, with 4 large 

 lobes; 3 antennae, 1 minute dorsal and 2 larger ventral 

 ones: 4 species. 



M. ringens Schrank (Fig. 370). Tube formed of 

 spherical pellets ; length .8 mm. : common on water plants. 



M. melicerta (Ehrenberg). Tube gelatinous ; length 1mm.; ventral 

 antennae very long: on water plants. 



2. Limnias Schrank. Corona broad, with 2 lobes; tube membra- 

 nous, often roughened by dirt and sometimes annulated; antennae as in 

 Melicerta: 3 species. 



Fig. 370 



Melicerta 



ringens 



(from Siissw. 



F. Deut.). 



