STEPHANOCEROS. 147 



form ; the old ones have the case large, covered 

 with extraneous matter, and with as many 

 as five eggs clearly seen within it, the body 

 larger, of a more plump form, much coloured, 

 and capable of stretching out, when feeding, to a 

 very considerable length. 



There are other genera of attached Rotatoria, 



which I will slightly describe, but that above 



* 



mentioned is the one most generally seen. Ste- 

 pltanoceros Eichhornii is a very wonderful crea- 

 ture, and of considerable size, but unfortunately 

 very rare. The case, is so transparent, that it 

 is rarely seen unless the water is coloured with 

 paint : it is larger than that of the Floscularia 

 ornata, and Dr. Mantell describes it as " attached 

 like a collar round the body at the upper margin, 



