EOTIFERA 



233 



Fig. 369 

 Stephanoceros 



fimbriatus 

 (Montgomery). 



F. ornata 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. STEPHANOCEROS Ehrenberg. 

 Lobes 5, very long, slender, and point- 

 Fig. 368 ed the cilia on them being non-vibra- 

 campani?Za?a tile and in rows or whorls; tube trans- 

 (Montgomery). parent; foot very l ong . I spe cies. 



S. fimbriatus (Goldfuss) (8. eiMornii Ehr.) (Fig. 369). Length 

 1.5 mm.: on aquatic plants; not common. 



FAMILY 2. MELICEKTIDAE. 



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: 



Oj Non-colonial rotifers. 



5j Corona distinctly 2 or 4-lobed. 



c x Corona 4-lobed 1. MELICERTA 



c a Corona 2-lobed 2. LIMNIAS 



6 a Corona oval or nearly circular and indistinctly 2-lobed. 



o, Colonial rotifers. 3 ' CEciSTES 



&! Colonies sessile, tubicolous or not. 



<?! Not tubicolous 4. MEGALOTROCHA 



c 2 Animals in transparent tubes 5. LACINULARIA 



6 2 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. 



ringens 



(from Siissw. 



F. Deut.). 



