ROTIFERA. 



403 



is found near the foot in all the genera. 

 Male organs, as glands, exist in Ladnularia 

 and Melicerta, perhaps also in Floscularia and 

 Stephanoceros. Vessels are seen in Ladnu- 

 laria. Tremulous gill-like organs in Stephano- 

 ceros and Ladnularia. Eyes are seen in all 



Fis. 29-2. 



except Tubicolaria. Nerve-like ganglia may 

 be found in Ladnularia, Limnias, and Meli- 

 certa. Two pairs of muscles contract the 

 body posteriorly (Jig. 5.). 



Analysis of the genera. 

 Eyes not"! 



Stephanoceros Eichornii. (After Ehrenberg.) 



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

 taining' a navicula and other infiisory animalcules ; 

 d, jaws j e, anal orifice ; f,f, ova. 



Hydatina senta. (After hrenberg.) 

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

 mentary canal, containing infusory animalcules ; 

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

 sels ; g, respiratory orifice ; h, seminal tubes ; , anal 

 orifice. 



D D 2 



