ROTIFERA. 



403 



is found near the foot in all the genera. 

 Male organs, as glands, exist in Lacinularia 

 and Melicerta, perhaps also in Floscularia and 

 Stephanoceros. Vessels are seen in Lacinu- 

 laria. Tremulous gill-like organs in Stephano- 

 ceros and Lacinularia. Eves are seen in all 



except Tubicola r ia. Nerve-like ganglia may 

 be found in Lacinularia, Limnias, and Meli- 

 certa. Two pairs of muscles contract the 

 body posteriorly (fig 5.). 



Analysis of the genera. 



Eyes not! 



present. 

 One eye. 



Two eye 

 (when 

 young). 



Tubicolaria. 



Stephanoceros 



Wheels 1 Separate. Limnias. 

 2-parted. j Segregate. Lacinularia. 



Wheels 1 

 4-parted. J 



Wheels 5-orl 



Melicerta. 



6-parttd. J 



Floscularia. 



293. 



Stephanoceros Eichornii. (After Ehrenberg.') 



a, single eye ; b, b, nervous ganglia ; e, crop, con- 

 taining a navicula and other infusory animalcules ; 

 d, jaws ; e, anal orifice ; /,/, ova. 



Hydatina senta. {AJ'ter Ehren 

 a, brain ; b, nervous cords ; c, ganglia ; <, ali- 

 mentary canal, containing infusory animalcules; 

 e, e, e, e, muscular fibres ; /, /, /, /, transverse ves- 

 sels; <;, respii-atory orifice;' ti, seminal tubes; i, anal 

 orifice. 



D D 2 



